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Journal articles on the topic 'Hydroxy selenide'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Kadu, Rahul, Monojit Batabyal, Heena Kadyan, Apurba Lal Koner, and Sangit Kumar. "An efficient copper-catalyzed synthesis of symmetrical bis(N-arylbenzamide) selenides and their conversion to hypervalent spirodiazaselenuranes and hydroxy congeners." Dalton Transactions 48, no. 21 (2019): 7249–60. http://dx.doi.org/10.1039/c8dt04832k.

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2

Eom, Taejun, and Anzar Khan. "Selenium-Epoxy ‘Click’ Reaction and Se-Alkylation—Efficient Access to Organo-Selenium and Selenonium Compounds." Chemistry 2, no. 4 (October 5, 2020): 827–36. http://dx.doi.org/10.3390/chemistry2040054.

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This work establishes the ‘click’ nature of the base-catalyzed oxirane ring opening reaction by the selenolate nucleophile. The ‘click’-generated ß-hydroxy selenide can be alkylated to afford cationic selenium species. Hemolytic studies suggest that selenonium cations do not lyse red blood cells even at high concentrations. Overall, these results indicate the future applicability of the developed organo-selenium chemistry in the preparation of a new class of cationic materials based on the seleno-ether motif.

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3

Eom, Taejun, and Anzar Khan. "Selenonium Polyelectrolyte Synthesis through Post-Polymerization Modifications of Poly (Glycidyl Methacrylate) Scaffolds." Polymers 12, no. 11 (November 13, 2020): 2685. http://dx.doi.org/10.3390/polym12112685.

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Atom transfer radical polymerization of glycidyl methacrylate monomer with poly(ethylene glycol)-based macroinitiators leads to the formation of reactive block copolymers. The epoxide side-chains of these polymers can be subjected to a regiospecific base-catalyzed nucleophilic ring-opening reaction with benzeneselenol under ambient conditions. The ß-hydroxy selenide linkages thus formed can be alkylated to access polyselenonium salts. 77Se-NMR indicates the formation of diastereomers upon alkylation. In such a manner, sequential post-polymerization modifications of poly(glycidyl methacrylate) scaffolds via selenium-epoxy and selenoether alkylation reactions furnish practical access to poly(ethylene glycol)-based cationic organoselenium copolymers.

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4

Tanini, Damiano, Alessandro Degl'Innocenti, and Antonella Capperucci. "Bis(trimethylsilyl)selenide in the Selective Synthesis of β-Hydroxy, β-Mercapto, and β-Amino Diorganyl Diselenides and Selenides Through Ring Opening of Strained Heterocycles." European Journal of Organic Chemistry 2015, no. 2 (November 21, 2014): 357–69. http://dx.doi.org/10.1002/ejoc.201403015.

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5

Tanini, Damiano, Alessandro Degl'Innocenti, and Antonella Capperucci. "ChemInform Abstract: Bis(trimethylsilyl)selenide in the Selective Synthesis of β-Hydroxy, β-Mercapto, and β-Amino Diorganyl Diselenides and Selenides Through Ring Opening of Strained Heterocycles." ChemInform 46, no. 22 (May 15, 2015): no. http://dx.doi.org/10.1002/chin.201522234.

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6

ABE, Hitoshi, Akira YAMASAKI, and Takashi HARAYAMA. "Direct Conversion of a Benzylic Hydroxy Group into a Selenenyl Group Using the Phenyl Trimethylsilyl Selenide-Aluminum Bromide Combination." CHEMICAL & PHARMACEUTICAL BULLETIN 46, no. 8 (1998): 1311–13. http://dx.doi.org/10.1248/cpb.46.1311.

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7

Wang, Hongwei, Hongchen Li, Guoqi Yu, Yun-Bing Zhou, Yalong Bai, Yanling Hei, and Junwei Chen. "Synthesis of β-Hydroxy Aryl Selenides via Transition-Metal-Free Three-Component Reaction of Arylamines, Elemental Selenium, and Epoxides." Synthesis 53, no. 19 (May 5, 2021): 3621–29. http://dx.doi.org/10.1055/a-1499-8742.

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AbstractAn efficient protocol for the construction of valuable β-hydroxy aryl selenides from easily available arylamines, elemental selenium, and epoxides through a transition-metal-free radical process is described. A wide variety of β-hydroxy aryl selenides were obtained in good to excellent yields with excellent stereo- and regioselectivity. In this reaction, two C–Se bonds can be built along with the cleavage of a C–N and C–O bond, demonstrating the high step economy and efficiency of this approach.

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8

ABE, H., A. YAMASAKI, and T. HARAYAMA. "ChemInform Abstract: Direct Conversion of a Benzylic Hydroxy Group into a Selenenyl Group Using the Phenyl Trimethylsilyl Selenide-Aluminum Bromide Combination." ChemInform 30, no. 5 (June 17, 2010): no. http://dx.doi.org/10.1002/chin.199905150.

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9

Lipinski, Boguslaw. "Redox-Active Selenium in Health and Disease: A Conceptual Review." Mini-Reviews in Medicinal Chemistry 19, no. 9 (May 6, 2019): 720–26. http://dx.doi.org/10.2174/1389557517666161104125022.

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Although it is generally accepted that selenium (Se) is important for life, it is not well known which forms of organic and/or inorganic Se compound are the most biologically active. In nature Se exists mostly in two forms, namely as selenite with fourvalent and selenate with sixvalent cations, from which all other inorganic and organic species are derived. Despite a small difference in their electronic structure, these two inorganic parent compounds differ significantly in their redox properties. Hence, only selenite can act as an oxidant, particularly in the reaction with free and/or protein- bound sulhydryl (SH) groups. For example, selenite was shown to inhibit the hydroxyl radicalinduced reduction and scrambled reoxidation of disulfides in human fibrinogen thus preventing the formation of highly hydrophobic polymer, termed parafibrin. Such a polymer, when deposited within peripheral and/or cerebral circulation, may cause irreversible damage resulting in the development of cardiovascular, neurological and other degenerative diseases. In addition, parafibrin deposited around tumor cells produces a protease-resistant coat protecting them against immune recognition and elimination. On the other hand, parafibrin generated by Ebola’s protein disulfide isomerase can form a hydrophobic ‘spike’ that facilitates virus attachment and entry to the host cell. In view of these specific properties of selenite this compound is a potential candidate as an inexpensive and readily available food supplement in the prevention and/or treatment of cardiovascular, neoplastic, neurological and infectious diseases.

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10

Jin, Li Ming, Chen Zhuang, Chun Shan Quan, Xiao Jing Zhao, and Sheng Di Fan. "Synthesis of Chitooligosaccharide-Selenium and its Antioxidant Activity In Vitro." Advanced Materials Research 680 (April 2013): 149–53. http://dx.doi.org/10.4028/www.scientific.net/amr.680.149.

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The objective of this study was to synthesize a new organic selenium compound, chitooligosaccharide-selenium (COSSe), and evaluate its antioxidant abilities on hydroxyl radicals, super oxide radicals and DPPH in vitro. Sodium selenite and chitooligosaccharide (COS) were used to synthesize COSSe by chemical method. The yield was 37.26% and the content of selenium (Se) was 9.02mg/g. COSSe was characterized by ultraviolet (UV) and infrared (IR) techniques. The results proved the successful synthesis of COSSe. The antioxidant activities on hydroxyl radicals, super oxide radicals and DPPH of COSSe were investigated. The results showed that antioxidant activities were concentration related in the setting concentration range and the antioxidant effects of COSSe were totally better than that of COS. The scavenging rates on hydroxyl radicals, superoxide radicals and DPPH of 2.5mg/mL COSSe were 71.19%, 64.54% and 69.78%, respectively. This research provides a possible application of COSSe as a low toxic and effective organic Se-enriched healthy product.

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11

Jin, Li Ming, Ning Geng, Chun Shan Quan, and Sheng Di Fan. "Synthesis and Antioxidant Activity of Carboxymethyl Chitosan-Selenium." Advanced Materials Research 734-737 (August 2013): 2100–2103. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.2100.

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The objective of this study was to synthesize a new organic selenium compound, carboxymethyl chitosan-selenium (CMCTS-Se), and evaluate its antioxidant abilities on hydroxyl radicals and superoxide radicals. Sodium selenite and carboxymethyl chitosan (CMCTS) were used to prepare CMCTS-Se. It was characterized by ultraviolet (UV) and infrared (IR) techniques. The results proved the successful synthesis of CMCTS-Se. The yield was 44.78% and the content of selenium (Se) was 20.50mg/g determined by colorimetry at 420nm using 3.3-diaminobenzidine as color-produced reagent. The antioxidant activities on hydroxyl radicals and super oxide radicals of CMCTS-Se were investigated. The results showed that antioxidant activities were concentration related in the setting concentration range and the antioxidant effects of CMCTS-Se were totally better than that of CMCTS. The scavenging rates on hydroxyl radicals and superoxide radicals of 2.0mg/mL CMCTS-Se were 68.25% and 62.15%, respectively. VC, a well-known antioxidant, as a standard in our assay, showed a little higher antioxidant activity than CMCTS-Se. This research provides a possible application of CMCTS-Se as a low toxic and effective organic Se-enriched healthy product.

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12

Rao, Zhong-Xing, Mike D. Tokach, Jason C. Woodworth, Joel M. DeRouchey, Robert D. Goodband, and Jordan T. Gebhardt. "114 Evaluation of Selenium Source on Nursery Pig Growth Performance, Serum and Tissue Selenium Concentrations, and Serum Antioxidant Status." Journal of Animal Science 100, Supplement_2 (April 12, 2022): 49–50. http://dx.doi.org/10.1093/jas/skac064.077.

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Abstract A total of 3,888 pigs (337×1050, PIC, Hendersonville, TN; 6.0 kg at weaning) were used in a 42-d study to determine the influence of Se source on nursery pig selenium status and growth performance. At placement, pens of pigs were weighed and allotted to 1 of 3 dietary treatments in a randomized complete block design with blocking structure including sow farm origin, date of entry, and average pen BW. A total of 144 pens were used with 72 double-sided 5-hole stainless steel, fence-line feeders, with feeder serving as the experimental unit. For each feeder, 1 pen contained 27 gilts and the other 27 barrows. There were 24 replicates per treatment. Diets were fed in 3 phases, and all contained 0.3 ppm added Se. A common phase 1 diet contained added Se from sodium selenite and was fed in pelleted form to all pigs for 7 d prior to initiation of treatment diets. Three Se sources [sodium selenite; Se yeast; and hydroxy-selenomethionine (OH-SeMet)] were used to formulate 3 experimental treatments in meal form for phase 2 (d 7 to 21) and phase 3 (d 21 to 42). During the common phase 1 period, ADFI tended (P < 0.10) to be different (107, 103, and 102 g/d) for sodium selenite, Se yeast, and OH-SeMet, respectively. From d 7 to 42 (treatment period), pigs fed OH-SeMet tended to have decreased ADG (P < 0.10) and had increased (P < 0.05) serum, liver, and muscle selenium concentration compared with other treatments. There was no difference (P > 0.05) in antioxidant status as measured by serum GSH-Px or TBARS. In summary, compared with sodium selenite and selenium yeast, OH-SeMet had greater bioavailability as indicated by increased serum and tissue selenium concentration; however, antioxidant status was similar between treatments and OH-SeMet tended to reduce growth performance compared with pigs fed sodium selenite.

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13

Cooper, Matthew A., and A. David Ward. "Cyclizations using Selenium Chemistry for Substituted 3-Hydroxypiperidines and 3-Hydroxypyrrolidines." Australian Journal of Chemistry 64, no. 10 (2011): 1327. http://dx.doi.org/10.1071/ch11073.

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The development of new methods for the stereoselective synthesis of nitrogen heterocycles is of current interest because of increasing demands for the syntheses of biologically important alkaloids and related compounds. It is shown that selenium-induced cyclization of 4-hydroxy-5-pentenylamines occurs regio- and stereo-selectively to afford cis-3-hydroxy-2-phenylselenomethylpyrrolidines, whereas 5-hydroxy-6-hexenylamines cyclize and give trans-3-hydroxy-2-phenylselenomethylpiperidines, with some compounds forming stable hydrates. In all cases cyclization proceeds regioselectively to give only the exo adducts with moderate to good diastereoselectivity. The reaction appeared to be under kinetic control as product ratios did not alter with time and the separated diastereomers did not interconvert when resubjected to the reaction conditions. These phenylseleno-substituted compounds could be transformed to diols by substitution of the corresponding selenone with a hydroxide ion. Substituted pyrrolidines and piperidines were thus afforded from unsaturated protected amines by electrophilic activation with SeII, followed by oxidation of the intermediate to SeVI and substitution with nucleophiles.

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14

Wischhusen, Pauline, Takaya Saito, Cécile Heraud, Sadasivam J. Kaushik, Benoit Fauconneau, Philip Antony Jesu Prabhu, Stéphanie Fontagné-Dicharry, and Kaja H. Skjærven. "Parental Selenium Nutrition Affects the One-Carbon Metabolism and the Hepatic DNA Methylation Pattern of Rainbow Trout (Oncorhynchus mykiss) in the Progeny." Life 10, no. 8 (July 25, 2020): 121. http://dx.doi.org/10.3390/life10080121.

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Selenium is an essential micronutrient and its metabolism is closely linked to the methionine cycle and transsulfuration pathway. The present study evaluated the effect of two different selenium supplements in the diet of rainbow trout (Onchorhynchus mykiss) broodstock on the one-carbon metabolism and the hepatic DNA methylation pattern in the progeny. Offspring of three parental groups of rainbow trout, fed either a control diet (NC, basal Se level: 0.3 mg/kg) or a diet supplemented with sodium selenite (SS, 0.8 mg Se/kg) or hydroxy-selenomethionine (SO, 0.7 mg Se/kg), were collected at swim-up fry stage. Our findings suggest that parental selenium nutrition impacted the methionine cycle with lower free methionine and S-adenosylmethionine (SAM) and higher methionine synthase (mtr) mRNA levels in both selenium-supplemented treatments. DNA methylation profiling by reduced representation bisulfite sequencing (RRBS) identified differentially methylated cytosines (DMCs) in offspring livers. These DMCs were related to 6535 differentially methylated genes in SS:NC, 6890 in SO:NC and 7428 in SO:SS, respectively. Genes with the highest methylation difference relate, among others, to the neuronal or signal transmitting and immune system which represent potential targets for future studies.

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15

Yang, Meng Tao, Feng Li, Yu Chao Wang, and Q. Y. Liu. "Synthesis of Selenium Nanoparticles in the Presence of Oyster Polysaccharides and the Antioxidant Activity." Applied Mechanics and Materials 522-524 (February 2014): 1143–46. http://dx.doi.org/10.4028/www.scientific.net/amm.522-524.1143.

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A simple method for synthesis of nanoselenium using oyster polysaccharides as soft template was investigated. The uniform stable selenium polysaccharides were obtained under the condition of reaction temperature 40°C, reaction time 3 h-5 h, the content of oyster polysaccharides 400mg/L and the content of sodium selenite 1mM. The size distribution and morphology of the product were confirmed by scanning electronic microscopy (SEM) and tansmission electronic microscope (TEM). The antioxidant activity of nanoselenium polysaccharides were studied in vitro. The results showed that nanoselenium polysaccharide is an effective hydroxyl radical and DPPH radical scavenger.

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16

Twinkle Francis, Preejitha V B, and Rajeshkumar S. "Antioxidant activity of Cynodon dactylon mediated selenium nanoparticles." International Journal of Research in Pharmaceutical Sciences 11, no. 4 (October 3, 2020): 6221–26. http://dx.doi.org/10.26452/ijrps.v11i4.3301.

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The nanoparticles are known to reduce toxicity, enhance bioactivity and improve targeting cells. The metal and metal oxide nanoparticles such as gold, silver, zinc oxide, zirconium oxide, copper oxide, copper sulfide, selenium, hydroxyl apatite, and titanium oxide were used in several biomedical applications especially diagnosis of cancer, etc. The selenium nanoparticles (SeNPs) are explored due toits unique characteristics and various known therapeutic benefits such as anti bacterial, anti fungal and anti cancer activities. The selenium nanoparticles actively involved in the free radical scavenging activity and anti inflammatory activity. The antioxidant activities and reducing risk of cancer.In this present study, Cynodondactylon or Bermuda grass mediated synthesis of selenium nanoparticles and it was characterized using UV- vis spectrophotometer. And its antioxidant effect was analysed using DPPH assay. The plant extract of Cynodondactylon was prepared using distilled water and mixed with the sodium selenite solution. The solution was kept in a magnetic stirrer at 100 RPM for constant stirring while being observed for any colour change. The results showed that there was a significant antioxidant activity and peak confirm the selenium nanoparticles formation. Finally we conclude that the selenium nanoparticles can be used in various drug designing aspects in future.

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17

Pankratov, Alexei N., Nikolay A. Bychkov, and Olga M. Tsivileva. "Hydrogen-Bonded Interactions in the Systems L-Cysteine - H2SeO3 and L-Cysteine -H2SeO4." International Journal of Chemoinformatics and Chemical Engineering 1, no. 2 (July 2011): 66–76. http://dx.doi.org/10.4018/ijcce.2011070105.

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Using the density functional theory method at the B3LYP/6-31G(d,p) level of theory, the formation of hydrogen-bonded complexes of L-cysteine with selenious and selenic acids has been studied. In both cases of selenium-containing acids, the complexes occur preferably by cysteine carboxylic group, therewith the enthalpy of formation values consist from –19 to –21 kcal/mol, and free energy from –6 to –9 kcal/mol. Probably, the initial act of interaction in the system hydroxyl-containing selenium compound - a-amino acid, proceeding with mutual orientation of the reactants molecules and intermolecular hydrogen bonds formation, serves as a prerequisite for the thiol group capability of participating in the subsequent stages (including more completed transformations) of biologically important reactions.

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18

Gruttadauria, Michelangelo, Paolo Lo Meo, Serena Riela, Francesca D’Anna, and Renato Noto. "Lipase-catalyzed resolution of β-hydroxy selenides." Tetrahedron: Asymmetry 17, no. 18 (October 2006): 2713–21. http://dx.doi.org/10.1016/j.tetasy.2006.10.010.

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19

Jóźwiak and Politycka. "Effect of Selenium on Alleviating Oxidative Stress Caused by a Water Deficit in Cucumber Roots." Plants 8, no. 7 (July 11, 2019): 217. http://dx.doi.org/10.3390/plants8070217.

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The aim of the study was to evaluate the antioxidant activity of selenium in the roots of Cucumis sativus L. seedlings pre-treated with selenium (Se) in the form of sodium selenite at concentrations of 1, 5, and 10 µM, and then subjected to a water deficit (WD). It has been hypothesized that Se, in low concentrations, alleviates an oxidative stress caused by a WD in the cucumber roots. A WD was introduced by the surface dehydration of roots. The aim of the research was to compare the changes accompanying oxidative stress in plants growing in the presence of Se and in its absence. The study concerns the generation of reactive oxygen species (ROS) —superoxide anions (O2•−), hydrogen peroxide (H2O2), and hydroxyl radicals (•OH)—as well the activities of the antioxidant enzymes lowering the ROS level—ascorbate peroxidase (APX), peroxidase (POX), catalase (CAT), and superoxide dismutase (SOD). A WD caused oxidative stress, i.e., the enhanced generation of ROS. Selenium at the concentrations of 1 and 5 μM increased the tolerance of cucumber seedlings to oxidative stress caused by a WD by increasing the activities of the antioxidant enzymes, and it also limited the damage of plasma membranes as a result of the inhibition of lipid peroxidation.

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20

Nascimento, Vanessa, Eduardo E. Alberto, Daniel W. Tondo, Daniel Dambrowski, Michael R. Detty, Faruk Nome, and Antonio L. Braga. "GPx-Like Activity of Selenides and Selenoxides: Experimental Evidence for the Involvement of Hydroxy Perhydroxy Selenane as the Active Species." Journal of the American Chemical Society 134, no. 1 (December 9, 2011): 138–41. http://dx.doi.org/10.1021/ja209570y.

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21

Grossi, Silvia, Luciana Rossi, Michele De Marco, and Carlo Angelo Sgoifo Rossi. "The Effect of Different Sources of Selenium Supplementation on the Meat Quality Traits of Young Charolaise Bulls during the Finishing Phase." Antioxidants 10, no. 4 (April 13, 2021): 596. http://dx.doi.org/10.3390/antiox10040596.

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The aim of the study was to compare the effects of sodium selenite (SS), selenium yeast (SY), and hydroxy-selenomethionine (OH-SeMet) on the meat quality and selenium (Se) deposition of finishing beef cattle. Sixty-three bulls were distributed over 3 treatments and fed SS, SY, or OH-SeMet at 0.2 mg kg−1 dry matter (DM) for 60 d. None of the Se sources affected the growth performance or carcass characteristics. OH-SeMet showed a higher Se transfer to the meat than SS or SY (p < 0.01). SY and OH-SeMet reduced the shear force of the meat (p < 0.0001), improved pH (p < 0.001), and reduced the drip losses (p < 0.001) and the lipid oxidation of the meat (p < 0.001). During 8 d of storage, OH-SeMet showed higher levels of meat lightness (L*) and yellowness (b*) than SS (p < 0.001), while the SY meat showed a higher L* than SS, albeit only on d 6. OH-SeMet improved b*, compared to SS, and also compared to SY on days 4, 7, and 8 (p < 0.001). Supplementing beef with SY and OH-SeMet improved several meat quality parameters. OH-SeMet appears to be the most effective strategy to improve the Se content and color stability of beef cattle meat.

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22

Chen, Xian, Huayue Wu, Weike Su, Rong Xu, Miaochang Liu, and Jinchang Ding. "Active Metallic Indium-Mediated Ring-Opening of Epoxides with Diphenyl Diselenides: A Novel One-Pot Synthesis of β-hydroxy Selenides in Aqueous Media." Journal of Chemical Research 2007, no. 6 (June 2007): 325–27. http://dx.doi.org/10.3184/030823407x218011.

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An efficient and simple one-pot procedure for the synthesis of β-hydroxy selenides in aqueous media through highly regioselective ring-opening of epoxides with diphenyl diselenide in the presence of active metallic indium is described.

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23

Zhang, Yikun, Sixue Wu, and Jie Yan. "New Catalytic Method for the Synthesis ofβ-Hydroxy Selenides." Helvetica Chimica Acta 99, no. 8 (August 2016): 654–58. http://dx.doi.org/10.1002/hlca.201600115.

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24

Costa, Carlos E., Giuliano C. Clososki, Henrique B. Barchesi, Sandra P. Zanotto, M. Graça Nascimento, and João V. Comasseto. "Enzymatic resolution of (RS)-β-hydroxy selenides in organic media." Tetrahedron: Asymmetry 15, no. 24 (December 2004): 3945–54. http://dx.doi.org/10.1016/j.tetasy.2004.11.007.

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25

Cerra, Bruno, Francesca Mangiavacchi, Claudio Santi, Anna Maria Lozza, and Antimo Gioiello. "Selective continuous flow synthesis of hydroxy lactones from alkenoic acids." Reaction Chemistry & Engineering 2, no. 4 (2017): 467–71. http://dx.doi.org/10.1039/c7re00083a.

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26

Gruttadauria, Michelangelo, Paolo Lo Meo, and Renato Noto. "Stereoselective synthesis of tetrahydrofurans and tetrahydropyrans by acid-catalyzed cyclization of hydroxy selenides and hydroxy sulfides." Tetrahedron 55, no. 49 (December 1999): 14097–110. http://dx.doi.org/10.1016/s0040-4020(99)00876-5.

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27

Ahmed, M. Jamaluddin, M. Tazul Islam, and Most Jannatul Nime. "A highly selective and sensitive spectrophotometric method for the determination of selenium using 2-hydroxy-1-napthaldehyde-orthoaminophenol." Analytical Methods 7, no. 18 (2015): 7811–23. http://dx.doi.org/10.1039/c5ay01311a.

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A very simple, ultra-sensitive and highly selective non-extractive spectrophotometric method for the determination of trace amounts of selenium using 2-hydroxy-1-napthaldehyde-orthoaminophenol (HNA-OAP) has been developed.

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28

Wang, Donghui, Naijian Ge, Shi Qian, Jinhua Li, Yuqin Qiao, and Xuanyong Liu. "Selenium doped Ni–Ti layered double hydroxide (Ni–Ti LDH) films with selective inhibition effect to cancer cells and bacteria." RSC Advances 5, no. 129 (2015): 106848–59. http://dx.doi.org/10.1039/c5ra18740k.

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Selenium doped LDH films effectively inhibit the growth of cancer cells and bacteria with little adverse effect on normal cells. The selectivity stems from the synergistic effect of the doped selenium and hydroxyl radicals produced by the LDH films.

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29

Janczak, Jan, and Genivaldo Julio Perpétuo. "A three-dimensional hydrogen-bonded network in bis(4-hydroxyanilinium) selenate(VI) dihydrate." Acta Crystallographica Section C Crystal Structure Communications 65, no. 3 (February 27, 2009): o121—o122. http://dx.doi.org/10.1107/s0108270109005782.

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The title compound, 2C6H8NO+·SeO42−·2H2O, contains 4-hydroxyanilinium cations, selenate(VI) anions and water molecules. One of the two independent cations is nearly planar (excluding the ammonium H atoms), while the other is markedly nonplanar, with the hydroxy and ammonium groups displaced from the plane of the benzene ring. This results from the antiparallel orientation of the cations, which interact through oppositely polarized ammonium and hydroxy groups. Ionic and hydrogen-bonding interactions join the oppositely charged units into a three-dimensional network. This work demonstrates the usefulness of 4-aminophenol in the crystal engineering of organic–inorganic hybrid compounds.

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30

Fašiangová, Miroslava, Gabriela Bořilová, Danka Haruštiaková, Dana Kumprechtová, Miroslav Cigánek, Radka Hulánková, Eric Auclair, and Ruth Raspoet. "The effects of selenium feed supplements on the oxidative stability indicators of egg yolk during the laying period." Acta Veterinaria Brno 90, no. 4 (2021): 465–75. http://dx.doi.org/10.2754/avb202190040465.

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The aim of this study was to assess the effects of four types of selenium (Se) feed supplements on the indicators of the oxidative stability of egg yolk. A total of 1,740 Bovans Brown laying hens were divided into 4 experimental and 1 control group. The diets fed to the experimental groups were supplemented with 0.2 mg/kg of Se, provided as sodium selenite, Se-enriched yeast, synthetic L-selenomethionine and hydroxy-analogue of selenomethionine. The highest concentrations of MDA, an indicator of secondary lipid oxidation, were confirmed in the Control Group eggs (P < 0.001). Egg yolks from the Control Group were found to have the highest lightness (P = 0.032), the lowest colour chroma and the lowest proportions of the red and yellow colours (P < 0.001). The highest vitelline membrane strength was measured in eggs from groups fed diets supplemented with organic Se (P < 0.001). No significant differences were found between groups in the total fatty acid content, the content of saturated and unsaturated fatty acids or the n-6/n-3 fatty acid ratios. Our study confirmed the effect of Se feed supplements on the concentration of MDA and the colour indicators of egg yolk and on the vitelline membrane strength.

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31

Lee, Han Kee, Zainal Abidin Talib, Md Shuhazlly Mamat @ Mat Nazira, EnZe Wang, Hong Ngee Lim, Mohd Adzir Mahdi, Eng Khoon Ng, Norita Mohd Yusoff, Batool Eneaze AL-Jumaili, and Josephine Ying Chyi Liew. "Effect of Sodium Hydroxide Concentration in Synthesizing Zinc Selenide/Graphene Oxide Composite via Microwave-Assisted Hydrothermal Method." Materials 12, no. 14 (July 18, 2019): 2295. http://dx.doi.org/10.3390/ma12142295.

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The effect of NaOH solution on the formation of nanoparticles has been the subject of ongoing debate in selenium-based material research. In this project, the robust correlation between the mechanistic growth of zinc selenide/graphene oxide (ZnSe/GO) composite and the concentration of NaOH are elucidated. The ZnSe/GO composite was synthesized via microwave-assisted hydrothermal method and the concentrations of NaOH are controlled at 2 M, 3 M, 4 M, 5 M and 6 M. The XRD spectra show that the crystal phases of the samples exhibited a 100% purity of ZnSe when the concentration of sodium hydroxide (NaOH) was set at 4 M. The further increase of NaOH concentration leads to the formation of impurities. This result reflects the essential role of hydroxyl ions in modifying the purity state of ZnSe/GO composite. The optical band gap energy of ZnSe/GO composite also decreased from 2.68 eV to 2.64 eV when the concentration of NaOH increased from 2 M to 4 M. Therefore, it can be concluded that the optimum concentration of NaOH used in synthesizing ZnSe/GO composite is 4 M. This project provides an alternative green method in the formation of a high purity ZnSe/GO composite.

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Gruttadauria, Michelangelo, Paolo Lo Meo, and Renato Noto. "Regiochemical control in the synthesis of tetrahydrofurans by acid-catalyzed cyclization of hydroxy selenides and hydroxy sulfides." Tetrahedron 55, no. 15 (April 1999): 4769–82. http://dx.doi.org/10.1016/s0040-4020(99)00149-0.

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33

Campo-Sabariz, Joan, David Moral-Anter, M. Teresa Brufau, Mickael Briens, Eric Pinloche, Ruth Ferrer, and Raquel Martín-Venegas. "2-Hydroxy-(4-methylseleno)butanoic Acid Is Used by Intestinal Caco-2 Cells as a Source of Selenium and Protects against Oxidative Stress." Journal of Nutrition 149, no. 12 (August 28, 2019): 2191–98. http://dx.doi.org/10.1093/jn/nxz190.

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ABSTRACT Background Selenium (Se) participates in different functions in humans and other animals through its incorporation into selenoproteins as selenocysteine. Inadequate dietary Se is considered a risk factor for several chronic diseases associated with oxidative stress. Objective The role of 2-hydroxy-(4-methylseleno)butanoic acid (HMSeBA), an organic form of Se used in animal nutrition, in supporting selenoprotein synthesis and protecting against oxidative stress was investigated in an in vitro model of intestinal Caco-2 cells. Methods Glutathione peroxidase (GPX) and thioredoxin reductase (TXNRD) activities, selenoprotein P1 protein (SELENOP) and gene (SELENOP) expression, and GPX1 and GPX2 gene expression were studied in Se-deprived (FBS removal) and further HMSeBA-supplemented (0.1–625 μM, 72 h) cultures. The effect of HMSeBA supplementation (12.5 and 625 μM, 24 h) on oxidative stress induced by H2O2 (1 mM) was evaluated by the production of reactive oxygen species (ROS), 4-hydroxy-2-nonenal (4-HNE) adducts, and protein carbonyl residues compared with a sodium selenite control (SS, 5 μM). Results Se deprivation induced a reduction (P < 0.05) in GPX activity (62%), GPX1 expression, and both SELENOP (33%) and SELENOP expression. In contrast, an increase (P < 0.05) in GPX2 expression and no effect in TXNRD activity (P = 0.09) were observed. HMSeBA supplementation increased (P < 0.05) GPX activity (12.5–625 μM, 1.68–1.82-fold) and SELENOP protein expression (250 and 625 μM, 1.87- and 2.04-fold). Moreover, HMSeBA supplementation increased (P < 0.05) GPX1 (12.5 and 625 μM), GPX2 (625 μM), and SELENOP (12.5 and 625 μM) expression. HMSeBA (625 μM) was capable of decreasing (P < 0.05) ROS (32%), 4-HNE adduct (49%), and protein carbonyl residue (75%) production after H2O2 treatment. Conclusion Caco-2 cells can use HMSeBA as an Se source for selenoprotein synthesis, resulting in protection against oxidative stress.

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Sun, Hua, Ling Zhao, Zi-Jian Xu, Michele De Marco, Mickael Briens, Xiang-Hua Yan, and Lv-Hui Sun. "Hydroxy-Selenomethionine Improves the Selenium Status and Helps to Maintain Broiler Performances under a High Stocking Density and Heat Stress Conditions through a Better Redox and Immune Response." Antioxidants 10, no. 10 (September 28, 2021): 1542. http://dx.doi.org/10.3390/antiox10101542.

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This study has determined whether hydroxy-selenomethionine (OH-SeMet) exerts a better protective action on broilers against environmental stress than sodium selenite (SS) or seleno-yeast (SY). Day-old male Cobb 500 broilers (12 cages/diet, 9 broilers/cage) were fed a selenium (Se)-deficient diet (0.047 mg/kg) supplemented with SS, SY or OH-SeMet at 0.3 mg Se/kg under a high stocking density and heat stress condition for six weeks. OH-SeMet improved the FCR and Se concentration in the tissues than SS and SY. SY and OH-SeMet both reduced the serum cortisol, T3, IL-6, IgA, IgM and LPS, more than SS, while only OH-SeMet further increased IL-10 and IgG. SY and OH-SeMet improved the intestinal morphology and increased the T-AOC, TXRND, SELENON and OCCLUDIN activities but decreased CLAUDIN2 in the jejunum than SS, while OH-SeMet further improved these values than SY. SY and OH-SeMet both increased SELENOS and TXNRD2 in the muscles than SS, and OH-SeMet further raised T-AOC, GPX4, SELENOP, SELENOW and TXNRD1, and reduced malondialdehyde and protein carbonyl in the muscles than SS and SY. OH-SeMet showed a better ability to maintain the performance and the redox and immune status of broilers under a high stocking density and heat stress challenge than SS and SY.

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35

Li, Qin, and Chi Zhang. "A Study of Antioxidant Activity about Seleno-Polysaccharide of Cordyceps militaris from Different Areas of China." Advanced Materials Research 807-809 (September 2013): 1984–87. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.1984.

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In this article,Cordyceps militaris,that from Hubei and Yunnan,were used as the research objects, to extract seleno-polysaccharide ,then the antioxidant activity of seleno-polysaccharide were determined by reducing power,the scavenging capacity on superoxide anion radical and hydroxyl radical.The results indicated that,the content of selenium in Hubei and Yunnan Cordyceps militaris samples were 210.0μg/g and 57.5μg/g,respectively;the share of Se-polysaccharide in total selenium were 11.086% and 26.713%,respectively,lower degree to turn the selenium organic in Hubei Cordyceps militaris.The reducing power of seleno-polysaccharide from Hubei and Yunnan Cordyceps militaris were 0.0253,0.0297,respectively;two kinds of Cordyceps militaris have certain ability to remove superoxide anion radical and different between them,the seleno-polysaccharide of Yunnan Cordyceps militaris has a better effect to remove superoxide anion radical under different sample amount.About hydroxyl radical,there were no ability to remove it.

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36

Wang, Xian-Long, Hong-Jie Li, and Jie Yan. "Iodine-mediated regioselective hydroxyselenenylation of alkenes: Facile access to β -hydroxy selenides." Chinese Chemical Letters 29, no. 3 (March 2018): 479–81. http://dx.doi.org/10.1016/j.cclet.2017.06.023.

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37

Leng, Tao, Ge Wu, Yun-Bing Zhou, Wenxia Gao, Jinchang Ding, Xiaobo Huang, Miaochang Liu, and Huayue Wu. "Silver-Catalyzed One-Pot Three-Component Selective Synthesis of β-Hydroxy Selenides." Advanced Synthesis & Catalysis 360, no. 22 (October 8, 2018): 4336–40. http://dx.doi.org/10.1002/adsc.201800896.

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38

Xin, Ping Liu, Yan Wu Hai, Chi Zhang, and Hui Zhang Sheng. "Research on Active Selenium Polysaccharide in Artemisia Argyi." Advanced Materials Research 634-638 (January 2013): 1054–57. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.1054.

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In this article, the selenium content of selenium polysaccharide and its antioxidant activity in vitro in Artemisia argyi has been studied. The double tracts atomic fluorescence spectrometry is used to detect the total selenium content in the sample and that of selenium polysaccharide in the active ingredient of the sample. The salicylic acid method and pyrogallol autoxidation method are used to detect the scavenging activity of selenium polysaccharide on hydroxyl radicals and superoxide anion. which grows in Yutangba, a selenium mining area of Enshi—“City of Selenium in China”. Through a comparative experiment with Artemisia argyi growing in non-selenium mining areas, the results have shown that the antioxidant ability of selenium polysaccharide in Se-enriched Artemisia argyi is significantly stronger than that of pure polysaccharide. Therefore, Se-enriched Chinese herbal medicine is a good natural antioxidant, which is worthy of exploitation and utilization.

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39

Gruttadauria, Michelangelo, Paolo Lo Meo, and Renato Noto. "ChemInform Abstract: Regiochemical Control in the Synthesis of Tetrahydrofurans by Acid-Catalyzed Cyclization of Hydroxy Selenides and Hydroxy Sulfides." ChemInform 30, no. 34 (June 13, 2010): no. http://dx.doi.org/10.1002/chin.199934132.

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40

Rádl, Stanislav, and Magda Janichová. "Synthesis and Antibacterial Activity of Some 3-Hydroxyquinolones." Collection of Czechoslovak Chemical Communications 57, no. 1 (1992): 188–93. http://dx.doi.org/10.1135/cccc19920188.

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A reductive decarboxylation of 7-chloro-1-ethyl-6-fluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (Id) with sodium borohydride provided the respective 1,2,3,4-tetrahydro derivative Va, which was treated with selenium dioxide to give product of dehydrogenation VIa. 3-Acetyl-1-ethyl-1,4-dihydroquinolin-4-ones VIb and VIc were oxidized with 3-chloroperoxybenzoic acid to the respective 3-hydroxyderivatives IIIa and IIIb. Compound IIIb was benzylated on a hydroxy group at position 3 to corresponding 3-benzyloxy derivative VIf which after prolonged heating with N-methylpiperazine in a sealed tube provided directly 3-hydroxy-7-(4-methyl-1-piperazinyl) derivative IIIc.

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41

Dereven'kov, Ilia A., Sergei V. Makarov, Adrian M. V. Brânzanic, Radu Silaghi-Dumitrescu, Pavel A. Molodtsov, and Elizaveta A. Pokrovskaya. "Formation of hydroxyl radical in aqueous solutions containing selenite and glutathione." Polyhedron 198 (April 2021): 115072. http://dx.doi.org/10.1016/j.poly.2021.115072.

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42

Renard, M., and L. Hevesi. "Preparation of 3-hydroxyl-vinyl selenides and 1,3-bis(seleeno)-propenes." Tetrahedron 41, no. 24 (January 1985): 5939–54. http://dx.doi.org/10.1016/s0040-4020(01)91434-6.

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43

Röse, Philipp, Steffen Emge, Jun-ichi Yoshida, and Gerhard Hilt. "Electrochemical selenium- and iodonium-initiated cyclisation of hydroxy-functionalised 1,4-dienes." Beilstein Journal of Organic Chemistry 11 (January 28, 2015): 174–83. http://dx.doi.org/10.3762/bjoc.11.18.

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The cobalt(I)-catalysed 1,4-hydrovinylation reaction of allyloxytrimethylsilane and allyl alcohol with substituted 1,3-dienes leads to hydroxy-functionalised 1,4-dienes in excellent regio- and diastereoselective fashion. Those 1,4-dienols can be converted into tetrahydrofuran and pyran derivatives under indirect electrochemical conditions generating selenium or iodonium cations. The reactions proceed in good yields and regioselectivities for the formation of single diastereomers.

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44

Balázs, Csaba, and Károly Rácz. "The relationship between selenium and gastrointestinal inflammatory diseases." Orvosi Hetilap 154, no. 41 (October 2013): 1628–35. http://dx.doi.org/10.1556/oh.2013.29723.

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Oxygen derived free radicals, generated by a number of cellular reactions, include superoxide anion, hydrogen peroxide and hydroxyl radicals. They exert their cytotoxic effects mainly via peroxidation of the cell membrane resulting in the loss of membrane integrity. The essential trace element, selenium exerts complex effects on the endocrine systems, partly due to its antioxidant capacity. Well-characterized selenoproteins include iodothyronine deiodinases, glutathione peroxidases and thioredoxin reductases involved in thyroid hormone metabolism and protection from oxidative damage. The value of selenium supplementation in autoimmune thyroid disorders has been investigated and most studies confirmed the beneficial effect of selenium supplementation in Hashimoto’s and Graves’s diseases. Recently, selenium proved to be effective in mild inflammatory orbitopathy. There are a number of reports about the effect of selenium in diabetes mellitus, but the data are controversial as both insulin-like and diabetes-inducing effects of selenium have been described. Selenium was successfully used in both female and male infertility of autoimmune origin. Orv. Hetil., 154 (41), 1628–1635.

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Li, Ningya, Zhijian Sun, Niel A. Karrow, Mickael Briens, Michele De Marco, and Huazhen Liu. "185 Impact of hydroxy-selenomethionine supplementation during late gestation and lactation in sows on piglet immunocompetence." Journal of Animal Science 97, Supplement_2 (July 2019): 107. http://dx.doi.org/10.1093/jas/skz122.190.

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Abstract The benefits of selenium (Se) supplementation during pregnancy and lactation in sows on piglet immunocompetence are not yet fully understood. This study aimed to assess piglet immune status when sows were fed Se-deficient or supplemented diets with sodium selenite (SS) or hydroxy-selenomethionine (OH-SeMet). Twelve pregnant sows were randomly assigned to 3 dietary treatments (4 sows each): no supplemental Se (NC), SS at 0.3 mg Se/kg (SS-0.3), OH-SeMet at 0.3 mg Se/kg (SO-0.3). The trial was carried out from gestation day (gd) 84 to weaning on postpartum day (ppd) 21, at which time all the piglets received the same diet having as Se source SS. On gd 98 and 105, sows were vaccinated with hen egg white lysozyme (HEWL). On ppd 0 and 21, 8 piglets/treatment were euthanized to obtain blood and muscle samples for total Se analyses. Serum samples were collected from 8 female piglets/treatment on ppd 0 and 2 to assess antigen-specific antibody titer for HEWL. On ppd 23, 6 weaned female piglets/treatment were intramuscular challenged with E. coli lipopolysaccharide (LPS) and serum IL-10 levels were measured at 24 h pre-challenge and at 2 and 48 h post challenge. At day 21, piglets from sows fed SO-0.3 showed the highest muscle Se deposition (P < 0.001). At ppd 0, no difference for HEWL-specific IgG was found while at ppd 2, SO-0.3 showed the highest HEWL-specific IgG concentration (P < 0.05). At 24 h pre-challenge and 2 h post LPS challenge, SO-0.3 showed a greater IL-10 level as compare to NC and SS-0.3, respectively (P < 0.05); no difference was found for the same parameter at 48 h post challenge. Piglets from SO supplemented sows exhibited stronger early immune response to LPS challenge. This study indicates the importance of sow Se supplementation with a pure organic form of Se such as OH-SeMet to enhance piglets Se and immune status.

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Zhang, Chi, and Xing Ping Liu. "Antioxidant Activity In Vitro of Selenium Polysaccharide of Thlaspi caerulescens L. Rich in Selenium." Advanced Materials Research 518-523 (May 2012): 5518–22. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.5518.

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The antioxidant capacity of the human body is closely related to its ability of disease resistance and anti-aging. It is a current research focus to find effective anti-oxidants used in medicine, food, health care, beauty make-up from natural plants. In this paper, we studied the content of selenium in selenium polysaccharide and its antioxidant activity in vitro of Thlaspi caerulescens L. produced from Yutangba of Enshi selenium mining area. The double tracts atomic fluorescence spectrometry is used to detect the total selenium content in the sample and that of selenium polysaccharide in the active ingredient of the sample. The salicylic acid method and pyrogallol autoxidation method are used to detect the scavenging activity of selenium polysaccharide on hydroxyl radicals and superoxide anion. Experiments show that the total amount of selenium in Thlaspi caerulescens L. is 708ug.g-1, while the amount of selenium in selenium polysaccharide is 98.1ug.g-1, accounting 13.86% of the total selenium content. Meanwhile, selenium polysaccharide in samples is with significant antioxidant capacity, and it shows a certain dose-effect relationship. Selenium polysaccharide has stronger anti-oxidation ability than pure polysaccharide compared with non-selenium polysaccharide. Therefore, plants rich in selenium are better natural antioxidants. This study will provide the necessary experimental basis for the effective and rational development and utilization of Thlaspi caerulescens L. rich in selenium

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47

Penteado, Filipe, Luana Bettanin, Kethelyn Machado, and Eder J. Lenardão. "Benzeneseleninic Acid in the Photo-Catalyzed Hydroxy-Selenylation of Styrenes." Chemistry Proceedings 2, no. 1 (November 10, 2020): 9. http://dx.doi.org/10.3390/eccs2020-07758.

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We established a new visible-light-mediated protocol for the regioselective β-hydroxyselenylation of olefins, employing benzeneseleninic acid as substrate. Regarding a novel approach, the benzeneseleninic acid emerges as an efficient and affordable reagent to be used as an electrophilic selenium source that can be easily converted to selenium-based radical species under visible-light conditions. In this sense, the photocatalytically formed PhSe• radical can react directly with unsaturated substrates, including alkenes, to access a new C–Se bond and a carbon-centered radical intermediate, which finally is trapped by a hydroxyl radical species, delivering the β-hydroxyselanyl compounds. Thus, despite the versatile utilities in organic synthesis, such as building blocks, the β-hydroxyselanyl compounds have demonstrated important biological activities. Based on that, we concentrated our efforts on developing a robust, effective, and environmentally benign methodology for their preparation. The optimal condition involves the reaction between styrene and 1.0 equivalent of phenylseleninic acid, in the presence of 5.0 mol% of eosin Y, as a cheap and easily available photocatalyst, with DMSO promoting the reaction medium. Satisfactorily, the system was irradiated with blue LED light for 2 h, to deliver the desired products in good yields.

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48

Rael, Rolando M., Ernesto C. Tuzaon, and William T. Frankenberger. "Gas-phase reactions of dimethyl selenide with ozone and the hydroxyl and nitrate radicals." Atmospheric Environment 30, no. 8 (April 1996): 1221–32. http://dx.doi.org/10.1016/1352-2310(95)00447-5.

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49

Kumar, A., J. S. Mehta, A. Kumar, and G. N. Purohit. "107 Administration of antioxidants improves serum total antioxidant capacity, testosterone, and seminal quality of Magra rams." Reproduction, Fertility and Development 33, no. 2 (2021): 160. http://dx.doi.org/10.1071/rdv33n2ab107.

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Oxidative stress is one of the most important factors responsible for poor quality of semen, and it is defined as an imbalance between the formation of reactive oxygen species (ROS, including hydroxyl radicals, superoxide anions, and hydrogen peroxide) and antioxidant capacity of semen. Antioxidants act as a powerful defence system against ROS attack in sperm cells by decreasing oxidative stress and they improve semen quality, which could be useful in the management of male infertility. Magra is a dual-purpose (wool and meat) hardy sheep breed that originated in the eastern and southern parts of the Bikaner district of Rajasthan, India. The present study evaluated the effects of the administration of vitamin E with selenium or vitamin C on serum antioxidants, testosterone, and seminal quality of Magra rams. Twenty-one Magra rams, aged between 1.5 and 2.5 years, were randomly assigned to treatment at weekly intervals with administration of either 1mL of vitamin E (tocopherol, 50mg mL−1) and selenium (1.5mg sodium selenite; n=7; VES), 8mL of vitamin C (250mg mL−1 sodium ascorbate; n=7; VC), or 1mL of saline (n=7; control) subcutaneously for 5 consecutive weeks. After the fourth week, semen and blood were collected twice a week for 5 consecutive weeks and assayed for seminal quality parameters, serum testosterone, and serum antioxidants. Data obtained were analysed statistically using te SPSS software (version 25.0; IBM Corp.). Mean values were compared using Duncan’s multiple range test. The semen parameters sperm motility, sperm concentration, live sperm percentage, and% HOST (hypo-osmotic swelling test)-positive sperm were significantly elevated, whereas reaction time and percentage of abnormal sperm were lower in both the treated groups compared with controls (P<0.05). Seminal pH declined significantly in the VES group (P<0.05), whereas it was not different between the VC and control groups of rams (P>0.05). Glutathione peroxidase, superoxide dismutase, and total antioxidant capacity concentrations were higher in serum and seminal plasma of treated rams (P<0.05). Serum testosterone concentrations were significantly elevated in VES and VC groups (P<0.05). We concluded that the administration of vitamin E and selenium or vitamin C improves the serum testosterone production and seminal quality of rams.

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50

Kumar, A., J. S. Mehta, A. Kumar, and G. N. Purohit. "107 Administration of antioxidants improves serum total antioxidant capacity, testosterone, and seminal quality of Magra rams." Reproduction, Fertility and Development 33, no. 2 (2021): 160. http://dx.doi.org/10.1071/rdv33n2ab107.

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Oxidative stress is one of the most important factors responsible for poor quality of semen, and it is defined as an imbalance between the formation of reactive oxygen species (ROS, including hydroxyl radicals, superoxide anions, and hydrogen peroxide) and antioxidant capacity of semen. Antioxidants act as a powerful defence system against ROS attack in sperm cells by decreasing oxidative stress and they improve semen quality, which could be useful in the management of male infertility. Magra is a dual-purpose (wool and meat) hardy sheep breed that originated in the eastern and southern parts of the Bikaner district of Rajasthan, India. The present study evaluated the effects of the administration of vitamin E with selenium or vitamin C on serum antioxidants, testosterone, and seminal quality of Magra rams. Twenty-one Magra rams, aged between 1.5 and 2.5 years, were randomly assigned to treatment at weekly intervals with administration of either 1mL of vitamin E (tocopherol, 50mg mL−1) and selenium (1.5mg sodium selenite; n=7; VES), 8mL of vitamin C (250mg mL−1 sodium ascorbate; n=7; VC), or 1mL of saline (n=7; control) subcutaneously for 5 consecutive weeks. After the fourth week, semen and blood were collected twice a week for 5 consecutive weeks and assayed for seminal quality parameters, serum testosterone, and serum antioxidants. Data obtained were analysed statistically using te SPSS software (version 25.0; IBM Corp.). Mean values were compared using Duncan’s multiple range test. The semen parameters sperm motility, sperm concentration, live sperm percentage, and% HOST (hypo-osmotic swelling test)-positive sperm were significantly elevated, whereas reaction time and percentage of abnormal sperm were lower in both the treated groups compared with controls (P<0.05). Seminal pH declined significantly in the VES group (P<0.05), whereas it was not different between the VC and control groups of rams (P>0.05). Glutathione peroxidase, superoxide dismutase, and total antioxidant capacity concentrations were higher in serum and seminal plasma of treated rams (P<0.05). Serum testosterone concentrations were significantly elevated in VES and VC groups (P<0.05). We concluded that the administration of vitamin E and selenium or vitamin C improves the serum testosterone production and seminal quality of rams.

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