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Artykuły w czasopismach na temat „N-methyl-morpholine N-oxide”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 15 lutego 2022

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Sprawdź 25 najlepszych artykułów w czasopismach naukowych na temat „N-methyl-morpholine N-oxide”.

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1

Potthast, A., T. Rosenau, P. Kosma, N. Schelosky i T. Baldinger. "Thermal Reactions of N-Methyl-morpholine-N-oxide (NMMO): A General Method for Separation and Quantification of N-Methyl-morpholine-N-oxide and its Main Degradation Products N-Methylmorpholine and Morpholine by Capillary Electrophoresis (CE)". Holzforschung 54, nr 6 (25.10.2000): 641–46. http://dx.doi.org/10.1515/hf.2000.108.

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Summary A general analytical method based on capillary electrophoresis with indirect UV detection has been developed to separate and quantify N-methylmorpholine-N-oxide (NMMO) and its main degradation products N-methylmorpholine (NMM) and morpholine (M). The electrolyte is based on the two major components 4-methylbenzylamine and 2-hydroxy-2-methylpropanoic acid (hydroxy-isobutyric acid, HIBA), the latter being used to adjust the pH to a value below 3.5 which is crucial for the electrophoretic mobility and, thus, for a good detectability of the amine oxide. The present method is widely applicable to monitor kinetics of reaction mixtures containing NMMO. NMM and M can be determined simultaneously even in a 1000-fold excess of NMMO. To monitor the fast and exothermic thermal degradation of NMMO by the electrophoretic method, special reaction conditions had to be developed for separating the initial decomposition step from super-imposed subsequent reactions. Reactive degradation products were removed by flushing with nitrogen, and the reaction rate was decreased by dilution with o-dichlorobenzene as an inert solvent. The initial phase of the decomposition reaction has been shown to follow second-order kinetics.

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2

Kim, Dong Bok, Wha Seop Lee, Seong Mu Jo, Young Moo Lee i Byoung Chul Kim. "Phase Transition of Cellulose Solutions in N-Methyl Morpholine N-Oxide Hydrates". Polymer Journal 33, nr 1 (styczeń 2001): 18–26. http://dx.doi.org/10.1295/polymj.33.18.

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3

Zhou, Shuang, Li Zhou, Ying Li, Fei Xie, He Li, Hui Yang, Wenjiang Li i Rony Snyders. "Preparation of cellulose-graphene oxide aerogels with N -methyl morpholine-N -oxide as a solvent". Journal of Applied Polymer Science 135, nr 15 (27.12.2017): 46152. http://dx.doi.org/10.1002/app.46152.

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4

Brøgger, Anja Funch, John Mitchell, Nagamani Koganti, Angelina Swali i Sandra Hill. "Can pasting in N-methyl morpholine N-oxide (NMMO) differentiate between tapioca starches?" Starch - Stärke 67, nr 11-12 (18.09.2015): 985–88. http://dx.doi.org/10.1002/star.201500084.

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5

Freddi, G., G. Pessina i M. Tsukada. "Swelling and dissolution of silk fibroin (Bombyx mori) in N-methyl morpholine N-oxide". International Journal of Biological Macromolecules 24, nr 2-3 (marzec 1999): 251–63. http://dx.doi.org/10.1016/s0141-8130(98)00087-7.

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6

Farhat, Farhat, Giovanni Vitali i Gianfrancesco Berchiesi. "Ternary system composed of H2O, N-methyl morpholine N-oxide and CF3COONa: Ultrasonic investigation". Journal of Molecular Liquids 59, nr 1 (styczeń 1994): 59–64. http://dx.doi.org/10.1016/0167-7322(94)80010-3.

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7

Chanzy, H., M. Paillet i R. Hagège. "Spinning of cellulose from N-methyl morpholine N-oxide in the presence of additives". Polymer 31, nr 3 (marzec 1990): 400–405. http://dx.doi.org/10.1016/0032-3861(90)90376-a.

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8

Zeng, Tong, Xun Ke, Lijuan Li, Xinlei Cheng, Yonghao Ni, Xinhua Ouyang, Xingye Zhang, Lihui Chen, Liulian Huang i Hui-Chao Hu. "Quantification of N-methyl morpholine N-oxide in biorefinery process solution by headspace gas chromatography". Cellulose 27, nr 12 (29.05.2020): 6861–70. http://dx.doi.org/10.1007/s10570-020-03259-7.

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9

Xu, Ying, Yaopeng Zhang, Huili Shao i Xuechao Hu. "Solubility and rheological behavior of silk fibroin (Bombyx mori) in N-methyl morpholine N-oxide". International Journal of Biological Macromolecules 35, nr 3-4 (kwiecień 2005): 155–61. http://dx.doi.org/10.1016/j.ijbiomac.2004.11.008.

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10

Ramakrishnan, S., J. Collier, R. Oyetunji, B. Stutts i R. Burnett. "Enzymatic hydrolysis of cellulose dissolved in N-methyl morpholine oxide/water solutions". Bioresource Technology 101, nr 13 (lipiec 2010): 4965–70. http://dx.doi.org/10.1016/j.biortech.2009.09.002.

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11

Sayyed, Anwar J., Lalaso V. Mohite, Niteen A. Deshmukh i Dipak V. Pinjari. "Effect of ultrasound treatment on swelling behavior of cellulose in aqueous N-methyl-morpholine-N-oxide solution". Ultrasonics Sonochemistry 49 (grudzień 2018): 161–68. http://dx.doi.org/10.1016/j.ultsonch.2018.07.042.

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12

Sayyed, Anwar J., Lalaso V. Mohite, Niteen A. Deshmukh i Dipak V. Pinjari. "Swelling kinetic study with mathematical modeling of cellulose pulp in aqueous N-methyl-morpholine-N-oxide solution". Reaction Kinetics, Mechanisms and Catalysis 133, nr 1 (31.05.2021): 101–15. http://dx.doi.org/10.1007/s11144-021-02000-0.

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13

Zhang, Shaokai, Chunxia Chen, Chao Duan, Huichao Hu, Hailong Li, Jianguo Li, Yishan Liu, Xiaojuan Ma, Jaroslav Stavik i Yonghao Ni. "Regenerated cellulose by the Lyocell process, a brief review of the process and properties". BioResources 13, nr 2 (13.03.2018): 4577–92. http://dx.doi.org/10.15376/biores.13.2.zhang.

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Lyocell fiber has emerged as an important class of regenerated cellulose that is produced based on the N-methyl morpholine-N-oxide (NMMO) dissolution method, and it has unique properties compared to viscose fiber. The NMMO technology provides a simple, resource-conserving, and environmentally friendly method for producing regenerated cellulose fiber. In this paper, the manufacturing process, environmental impact, and product quality of lyocell fiber are reviewed and compared with those of the conventional viscose fiber.

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14

Koganti, Nagamani, John Mitchell, William MacNaughtan, Sandra Hill i Tim Foster. "Effect of granule organisation on the behaviour of starches in the NMMO (N-methyl morpholine N-oxide) solvent system". Carbohydrate Polymers 116 (luty 2015): 103–10. http://dx.doi.org/10.1016/j.carbpol.2014.06.060.

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15

Marsano, Enrico, Paola Corsini, Cristina Arosio, Alessandra Boschi, Michele Mormino i Giuliano Freddi. "Wet spinning of Bombyx mori silk fibroin dissolved in N-methyl morpholine N-oxide and properties of regenerated fibres". International Journal of Biological Macromolecules 37, nr 4 (grudzień 2005): 179–88. http://dx.doi.org/10.1016/j.ijbiomac.2005.10.005.

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16

Yau, E., K. Badal, G. Brodeur, J. Collier, J. Telotte i S. Ramakrishnan. "Enzymatic Hydrolysis ofN-Methyl Morpholine N-oxide and Ionic Liquid-treated Cellulose: A Comparative Study". Indian Chemical Engineer 55, nr 4 (grudzień 2013): 235–46. http://dx.doi.org/10.1080/00194506.2013.851993.

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17

Kim, Dong Bok, Wha Seop Lee, Seong Mu Jo, Young Moo Lee i Byoung Chul Kim. "Effect of Thermal History on the Phase Behavior of N-Methyl Morpholine N-Oxide Hydrates and Their Solutions of Cellulose". Polymer Journal 33, nr 2 (luty 2001): 139–46. http://dx.doi.org/10.1295/polymj.33.139.

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18

Righi, Serena, Andrea Morfino, Paola Galletti, Chiara Samorì, Alessandro Tugnoli i Carlo Stramigioli. "Comparative cradle-to-gate life cycle assessments of cellulose dissolution with 1-butyl-3-methylimidazolium chloride and N-methyl-morpholine-N-oxide". Green Chem. 13, nr 2 (2011): 367–75. http://dx.doi.org/10.1039/c0gc00647e.

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19

Yuan, Hongmei, Jianfei Wu, Junkang Lin, Liulian Huang, Lihui Chen i Shan Lin. "Effect of chitosan on membrane formation and processability of bamboo dissolving pulp based ultrafiltration membrane". BioResources 16, nr 3 (6.05.2021): 4752–68. http://dx.doi.org/10.15376/biores.16.3.4752-4768.

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Bamboo dissolving pulp (BP)/chitosan (CS) blend solutions were obtained by adding different weight ratios of BP and CS particles to N-methyl-morpholine-N-oxide (NMMO) solvent. The processing and membrane-forming performances of the blend solutions were studied using a rotating rheometer. The BP/CS blend solutions’ optimal processing temperature was 50 to 70 °C. When the CS weight ratio was 9.09 wt%, the viscosity of the solution decreased, which was conducive to the processing of the membrane. The BP/CS blend ultrafiltration membranes were prepared by phase transformation of the blend solutions. The results showed that the rejection rate of the BP/CS blend ultrafiltration membrane with physically added CS particles was greatly improved compared with that of the regenerated BP ultrafiltration membrane.

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20

Siadat, Seyedeh Ameneh, i Javad Mokhtari. "The Role of Polyhexamethylene Biguanide and Silver Nanoparticle Interaction in the Fabrication of Novel Antibacterial Bio-Fibers Using Silk Wastage". Journal of Nano Research 43 (wrzesień 2016): 63–72. http://dx.doi.org/10.4028/www.scientific.net/jnanor.43.63.

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Regenerated silk fibers were fabricated through dry-wet spinning process using N-methyl morpholine N-oxide and methanol as solvent and coagulant, respectively. Several concentrations of polyhexamethylene biguanide (PHMB) (0.5, 0.75 and 1% (v/v)) and silver nanoparticles (AgNPs) (5, 15, 55, 95 and 135 ppm) were used as antibacterial agents. Antibacterial property of bio-fibers produced by either master batch or dipping process methods was compared to each other against a gram-positive bacterium, Staphylococcus aurous. Master batch process was indicated the dependency of antibacterial effect on the concentration of antibacterial agents as well as particle size. Maximum bactericidal activity in this process was obtained at concentrations of 55 ppm of AgNPs and 1% (v/v) of PHMB. The result from dipping process showed that various concentrations of PHMB can greatly influence on the results; the interaction of 55 ppm AgNPs and 0.75% of PHMB offered good inhibition effect with the least amount of color change on bio-fibers.

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21

Shafiei, Marzieh, Keikhosro Karimi, Hamid Zilouei i Mohammad J. Taherzadeh. "Enhanced Ethanol and Biogas Production from Pinewood by NMMO Pretreatment and Detailed Biomass Analysis". BioMed Research International 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/469378.

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N-Methyl morpholine-N-oxide (NMMO) is an environmentally friendly and commercially applied cellulose solvent that is suggested for pretreatment of lignocelluloses to improve biofuel productions. However, the underlying mechanisms of the improvements have been poorly understood yet. In an attempt to investigate the mechanisms, pinewood powder and chips were pretreated with 85% (w/w) NMMO at 120°C for 1–15 h. The pretreatment improved ethanol production yield from 7.2% (g/g) for the untreated wood powder to 68.1–86.1% (g/g) and from 1.7% (g/g) for the untreated wood chips to 12.6–51.2% (g/g) of theoretical yield. Similarly, the biogas yields of untreated wood chips and powder were improved from 21 and 66 (mL/g volatile solids) by 3.5–6.8- and 2.6–3.4-folds, respectively. SEM micrographs indicated major increase in the wood porosity by the pretreatment, which would confirm increase in the water swelling capacity as well as enzyme adsorption. The analysis of X-ray diffraction showed considerable reduction in the cellulose crystallinity by the pretreatment, while FTIR spectroscopy results indicated reduction of lignin on the wood surface by the pretreatment.

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22

Kwon, N. S., D. J. Stuehr i C. F. Nathan. "Inhibition of tumor cell ribonucleotide reductase by macrophage-derived nitric oxide." Journal of Experimental Medicine 174, nr 4 (1.10.1991): 761–67. http://dx.doi.org/10.1084/jem.174.4.761.

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Macrophage-derived nitric oxide (NO) is cytostatic to tumor cells and microbial pathogens. We tested whether one molecular target for the cytostatic action of NO may be ribonucleotide reductase (RR), a rate-limiting enzyme in DNA synthesis. In a concentration-dependent manner, NO gas and lysates of activated macrophages that generated comparable amounts of NO led to the same degree of inhibition of partially purified RR from L1210 mouse lymphoma cells. Lysates from nonactivated macrophages, which do not produce NO, were noninhibitory. With lysates from activated macrophages, RR was protected by omitting L-arginine or by adding the NO synthase inhibitors diphenyleneiodonium, N omega-methyl-L-arginine, or N omega-amino-L-arginine. L-Arginine, but not D-arginine, abolished the protective effect of N omega-amino-L-arginine. The prototypic pharmacologic inhibitor of RR is hydroxyurea. Its structural resemblance to N omega-hydroxy-L-arginine, a reaction intermediate of NO synthase, prompted us to test if hydroxyurea can generate NO. In the presence of H2O2 and CuSO4, hydroxyurea produced NO2-/NO3-, aerobic reaction products of NO. Addition of morpholine blocked NO2-/NO3- generation from hydroxyurea and led to formation of nitrosomorpholine, as detected by gas chromatography/mass spectrometry. Thus, hydroxyurea can produce an NO-like, nitrosating rectant. L1210 cell DNA synthesis was inhibited completely by activated macrophages or by hydroxyurea, and was partially restored to the same degree in both settings by providing deoxyribonucleosides to bypass the block in RR. Thus, both NO gas and NO generated by activated macrophage lysates inhibit tumor cell RR. The RR inhibitor hydroxyurea can also generate an NO-like species. Similar, partial restoration of tumor cell DNA synthesis by deoxyribonucleosides in the presence of activated macrophages or hydroxyurea suggests that cytostasis by activated macrophages and by hydroxyurea has comparable mechanisms, including, but probably not limited to, inhibition of RR.

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23

MAGALHÃES, WASHINGTON LUIZ ESTEVES, XIAODONG CAO, MAGALY ALEXANDRA RAMIRES i LUCIAN A. LUCIA. "Novel all-cellulose composite displaying aligned cellulose nanofibers reinforced with cellulose nanocrystals". April 2011 10, nr 4 (1.05.2011): 19–25. http://dx.doi.org/10.32964/tj10.4.19.

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Aligned cellulose nanocrystals/cellulose coelectrospun nanofibers were successfully prepared by using a home-built coelectrospinning and collection system. Cellulose I was dissolved in N-methyl morpholine oxide at 120°C and diluted with dimethyl sulfoxide, which was used in the external concentric capillary needle as the sheath (shell) solution. A cellulose nanocrystal suspension obtained by sulfuric acid hydrolysis of cotton fibers was used as the core liquid in the internal concentric capillary needle after transferring from water to dimethyl sulfoxide. The resultant coelectrospun nanocomposite films were collected onto a rotating wire drum and were characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy, thermogravimetric analysis, and tensile measurements. The FE-SEM image showed that the cellulose nanocrystals did not appear to cluster in the film formed. Although the crystallinity index of nanocomposite fibers was lower than the unreinforced cellulose electrospun fibers, the cellulose type II reinforced with cellulose nanocrystals had a much higher tensile stress (about 140 MPa), almost twofold that of pure cellulose. This latter result indicated that the alignment and adhesion of amorphous cellulose nanofibers played a crucial role on the mechanical properties of electrospun cellulosic fiber mats.

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24

Badshah, Munair, Hanif Ullah, Feng He, Fazli Wahid, Umar Farooq, Mattias Andersson i Taous Khan. "Development and Evaluation of Drug Loaded Regenerated Bacterial Cellulose-Based Matrices as a Potential Dosage Form". Frontiers in Bioengineering and Biotechnology 8 (3.12.2020). http://dx.doi.org/10.3389/fbioe.2020.579404.

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Bacterial cellulose (BC) is a highly pure form of cellulose and possesses superior physico-mechanical properties with wide range of applications. These properties of BC can further be improved by various modifications, including its regeneration from the BC solution. In the current research work, regenerated BC (R-BC) matrices were prepared using N-methyl-morpholine-oxide (NMMO; 50% w/w solution in water) and loaded with model drugs, i.e., famotidine or tizanidine. The characterization of drug loaded regenerated BC (R-BC-drug) matrices was carried out using Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA), which revealed the stability of matrices and successful drug loading. Results of dissolution studies showed immediate (i.e., >90%) drug release in 30 min. The drugs release data was found to best fit into first order kinetics model having R2 values >0.99 for all the formulations. These results indicated that regenerated BC-based matrices had the ability to be used for delivery of orally administered drugs.

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25

Zukerman-Schpector, Julio, Mauricio Vega-Teijido, Cristina C. Carvalho, Paulo C. Isolani i Ignez Caracelli. "Structure characterization of molecular complexes for non-linear optical materials. II. 1 : 1 complexes of 4-methyl-morpholine-N-oxide (1) and 3-picoline-N-oxide (2) with 2,4,6-trinitrophenol, studied by X-ray, AM1 and DFT calculations". Zeitschrift für Kristallographie 222, nr 8 (styczeń 2007). http://dx.doi.org/10.1524/zkri.2007.222.8.427.

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