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Letteratura scientifica selezionata sul tema "Organic acids"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Organic acids"

Uttry, Alexander, e Manuel van Gemmeren. "Direct C(sp3)–H Activation of Carboxylic Acids". Synthesis 52, n. 04 (17 ottobre 2019): 479–88. http://dx.doi.org/10.1055/s-0039-1690720.

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Carboxylic acids are important in a variety of research fields and applications. As a result, substantial efforts have been directed towards the C–H functionalization of such compounds. While the use of the carboxylic acid moiety as a native directing group for C(sp2)–H functionalization reactions is well established, as yet there is no general solution for the C(sp3)–H activation of aliphatic carboxylic acids and most endeavors have instead relied on the introduction of stronger directing groups. Recently however, novel ligands, tools, and strategies have emerged, which enable the use of free aliphatic carboxylic acids in C–H-activation-based transformations.1 Introduction2 Challenges in the C(sp3)–H Bond Activation of Carboxylic Acids3 The Lactonization of Aliphatic Carboxylic Acids4 The Directing Group Approach5 The Direct C–H Arylation of Aliphatic Carboxylic Acids6 The Direct C–H Olefination of Aliphatic Carboxylic Acids7 The Direct C–H Acetoxylation of Aliphatic Carboxylic Acids8 Summary

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Siggel, Michele R., e T. Darrah Thomas. "Why are organic acids stronger acids than organic alcohols?" Journal of the American Chemical Society 108, n. 15 (luglio 1986): 4360–63. http://dx.doi.org/10.1021/ja00275a022.

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Yang, Xiaoyan, Chuandong Zhang, Haiping Gu, Xiangwei Chen e Erhui Guo. "Organic acids promote phosphorus release from Mollisols with different organic matter contents". Soil and Water Research 16, No. 1 (11 dicembre 2020): 59–66. http://dx.doi.org/10.17221/140/2019-swr.

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Organic acids could improve the phosphorus (P) availability through enhancing the release of inorganic phosphorus (Pi) in the soil. However, the effects of organic acids on the Pi release are still poorly understood, especially from soils with different organic matter contents. Here, a biochemically produced humic acid and P fertiliser were added to the soil to modify the content of the soil organic matter (SOM) and soil P, respectively. And then the soil samples were incubated at 25 °C for 30 days. The release of Pi fractions (such as H2O-Pi, NaHCO3-Pi, NaOH-Pi, HCl-Pi, and Residual-P) from the soils with different organic matter contents in the presence of citric, oxalic, and malic acids was evaluated using a sequential chemical fractionation method. The results showed that the release of the NaHCO3-Pi, NaOH-Pi, and HCl-Pi fractions also showed a decreasing trend with an increasing content of soil organic matter, and more NaOH-Pi than the other Pi fractions was generally released in the presence of organic acids. Considering the types of organic acids, oxalic acid and malic acid most effectively and least effectively released Pi, respectively. The path analysis indicated that the NaOH-Pi release had the highest direct and indirect effects on the total inorganic P (TPi) release. NaOH-Pi was, therefore, the most effective source of Pi in the Mollisols.

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Gladkikh, I. F., Iu V. Danilenko e S. V. Pestrikov. "ORGANIC ACIDS OF ASMOL". Oil and Gas Business, n. 4 (agosto 2015): 362–73. http://dx.doi.org/10.17122/ogbus-2015-4-362-373.

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Ergönül, P. G., e C. Nergiz. "Determination of organic acids in olive fruit by HPLC". Czech Journal of Food Sciences 28, No. 3 (1 luglio 2010): 202–5. http://dx.doi.org/10.17221/1379-cjfs.

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Organic acids (oxalic, citric, malic, and succinic) contents of Domat, Memecik and Uslu varieties of olives grown in Turkey were investigated using HPLC method. Organic acids were extracted from olives with water-methanol mixture solution 75:25 (v/v) and were analysed through KC-118 ion-exchange column using UV absorbance detector at 214 nm. The mobile phase was phosphoric acid (0.1%, w/v). The recovery values of the organic acids added into olive fruit samples were 92.8%, 98.75%, 110%, and 86% for oxalic, citric, malic, and succinic acids, respectively.

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Campolo, Orlando, Antonino Malacrinò, Francesca Laudani, Giuseppe M. Algeri, Giulia Giunti, Cinzia P. Strano, Paolo Zoccali e Vincenzo Palmeri. "Field efficacy of two organic acids against Varroa destructor". Entomologia Generalis 36, n. 3 (1 luglio 2017): 251–60. http://dx.doi.org/10.1127/entomologia/2017/0430.

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Yong, Raymond N., e Diana Mourato. "Extraction and characterization of organics from two Champlain Sea subsurface soils". Canadian Geotechnical Journal 25, n. 3 (1 agosto 1988): 599–607. http://dx.doi.org/10.1139/t88-066.

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The focus of this investigation is to establish whether organic materials are present in subsurface soils in measurable and significant quantities. Two subsurface soils from the Champlain Sea region were chosen for study. Organic carbon concentrations of 0.5% as total organic carbon (TOC) were detected in the soils studied at depths up to 14.2 m. The extraction and subsequent analyses of organic compounds permitted one to classify these as humic acids, fulvic acids, humins, and nonhumic materials. Extraction of these subsurface soil organics was achieved using a modified HCl–NaOH extraction method. The extracted organics were analyzed for TOC to confirm their organic nature as well as for study of their surface chemistry. The compositional and structural characteristics of the extracts were investigated using infrared spectroscopy and scanning electron microscopy. Key words: subsurface soil organics, humic materials, nonhumic organics, organics extraction, Champlain Sea clays.

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Navrotsky, Alexandra, Richard Hervig, James Lyons, Dong-Kyun Seo, Everett Shock e Albert Voskanyan. "Cooperative formation of porous silica and peptides on the prebiotic Earth". Proceedings of the National Academy of Sciences 118, n. 2 (29 dicembre 2020): e2021117118. http://dx.doi.org/10.1073/pnas.2021117118.

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Modern technology has perfected the synthesis of catalysts such as zeolites and mesoporous silicas using organic structure directing agents (SDA) and their industrial use to catalyze a large variety of organic reactions within their pores. We suggest that early in prebiotic evolution, synergistic interplay arose between organic species in aqueous solution and silica formed from rocks by dynamic dissolution–recrystallization. The natural organics, for example, amino acids, small peptides, and fatty acids, acted as SDA for assembly of functional porous silica structures that induced further polymerization of amino acids and peptides, as well as other organic reactions. Positive feedback between synthesis and catalysis in the silica–organic system may have accelerated the early stages of abiotic evolution by increasing the formation of polymerized species.

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Taylor, Agnes R., Amanda Albright Olsen, Elisabeth M. Hausrath, Brian J. Olsen e Dawn Cardace. "The Role of Sulfuric Acid, Abiotic–Organic Acids, and Biotic Acids on Serpentinite Dissolution and Trace Metal Release". Minerals 14, n. 3 (28 febbraio 2024): 256. http://dx.doi.org/10.3390/min14030256.

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Organic acids produced by biota have been shown to accelerate the dissolution of minerals, possibly creating biosignatures in either reacting solutions or the solid materials. We tested aqueous alteration of serpentinite in three groups of solutions: inorganic acids, organic acids created through abiotic processes (termed “abiotic–organics”), and organic acids created through biotic processes (termed “biotic acids”) over a range of temperatures relevant to conditions on Mars and Europa. A total of 48 batch reactor experiments were carried out at 0 °C, 22 °C, and 62 °C in 16 different acids at pH 2.6 over 28 days. Additional experiments were conducted in sulfuric acid solutions to assess aqueous alteration in sulfate-rich environments. These results show that biotic acids accelerate serpentinite dissolution compared to the control inorganic acid, whereas abiotic–organic acids have little or no effect. Sulfuric acid enhances serpentinite dissolution over nitric acid. Secondary precipitates found in the presence of biotic acids were consistently enhanced in Mn, Ti, and W. We propose that these preferentially released elements and secondary minerals may be potential biosignatures. We also show that the release of the rock-forming elements Mg and Si is correlated with stability constants for the metal–acid aqueous complex, providing a possible mechanistic interpretation of the observed results.

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Yaremenko, Ivan A., Peter S. Radulov, Yulia Yu Belyakova, Dmitriy I. Fomenkov, Svetlana B. Tsogoeva e Alexander O. Terent’ev. "Lewis Acids and Heteropoly Acids in the Synthesis of Organic Peroxides". Pharmaceuticals 15, n. 4 (13 aprile 2022): 472. http://dx.doi.org/10.3390/ph15040472.

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Organic peroxides are an important class of compounds for organic synthesis, pharmacological chemistry, materials science, and the polymer industry. Here, for the first time, we summarize the main achievements in the synthesis of organic peroxides by the action of Lewis acids and heteropoly acids. This review consists of three parts: (1) metal-based Lewis acids in the synthesis of organic peroxides; (2) the synthesis of organic peroxides promoted by non-metal-based Lewis acids; and (3) the application of heteropoly acids in the synthesis of organic peroxides. The information covered in this review will be useful for specialists in the field of organic synthesis, reactions and processes of oxygen-containing compounds, catalysis, pharmaceuticals, and materials engineering.

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Tesi sul tema "Organic acids"

Turkmenoglu, Secil. "Organic Acids Production From Cheese-whey". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607709/index.pdf.

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In this study, production of organic acids from cheese-whey was studied. Optimization of organic acids production was performed in semi-batch and batch reactors. Two sets of experiments were performed. First set of experiments were performed in semi-batch reactors for the optimization of organic loading rate (OLR) and hydraulic retention time (HRT). As a result of Set 1 experiments optimum OLR was found to be 15 g COD l-1. Second set of experiments were performed in batch reactors by using the optimum OLR found in Set 1 experiments. Set 2 experiments were conducted to study the effect of using different seed cultures and Basal Media (BM) on Volatile fatty avid (VFA) production. Main acidogenesis products were acetic acid (Hac), butyric acid (Buty) and propionic acid (HPr) with smaller quantities of i-butyric acid (i-Buty), valeric acid (Val) and caproic acid (Cap). It was seen that BM had a suppressive effect on ethanol (EtOH) production while it stimulated the VFA production. Higher VFA productions and variety of VFA types were observed in Test Reactors seeded with acidogenic culture (R3 and R6).

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Adams, FV, PA Olubambi, FH Potgieter e Der Merwe F. Van. "Corrosion resistance of duplex stainless steels in selected organic acids and organic acid/chloride environments". Anti-Corrosion Methods and Materials, 2010. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001195.

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Abstract Purpose – The purpose of this paper is to supplement the scant previous investigations on the corrosion behaviour of 2205 and 2507 duplex stainless steels in selected organic acids containing chloride additions. Design/methodology/approach – Microstructural examination of the alloys was first carried out, after which the corrosion behaviour of the alloys in citric, oxalic, formic and acetic acids containing chloride additions at varying temperatures was studied using electrochemical techniques. Findings – The alloy 2507 material had a larger grain size than did the alloy 2205 sample. The corrosion resistances of the alloys generally are highest in acetic acids and lowest in citric acid. The addition of chloride had a pronounced effect on their corrosion resistance. Alloy 2507 generally exhibited higher corrosion resistance in all of the acids than alloy 2205, with the exception of acetic acid at room temperature. The 50:50 ratio of ferrite to austenite composition, as revealed by phase compositional analysis, indicated no significant possibility for galvanic corrosion between the phases. This suggests that the corrosion behaviour of the alloys is controlled by their grain sizes and chemical compositions. Originality/value – Although the corrosion behaviour of duplex stainless steels in some organic acid media has been reported, this investigation covers the major organic acids not previously reported. Since in real industrial systems a mixture of both organic and minerals acids/salts may typically exist, investigations of the combined effect of chloride ions with the organic acids reported in this paper typify real industrial operations. The paper thus provides a basis for material selection for the application of 2205 and 2507 in industrial systems where organic acids are mostly used.

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Ogden, Sharon Kay. "Preservation of meat by organic acids". Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339579.

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Khademi, Zahra. "Organic acids behavior in calcareous soils". Thesis, Bangor University, 2006. https://research.bangor.ac.uk/portal/en/theses/organic-acids-behavior-in-calcareous-soils(cc53b48c-64b5-4037-8a1f-d4382e2dfac7).html.

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Organic acids have been hypothesized to be important in mobilizing nutrients in calcareous soils, however, evidence to support this was lacking. This thesis investigates the effect of increasing concentrations of H-citrate, K-citrate, H-oxalate and K-oxalate on the solubility and uptake of P, Fe, Mn, Zn and Cu in plants growing in calcareous soils. In this study, the fate and capacity of organic acids as mechanisms for solubilizing mineral nutrients was investigated by measuring the sorption, and biodegradation reactions of citrate and oxalate in soil. This study has shown that the sorption reactions of oxalate and citrate in soil are rapid and that the degree of sorption is organic acid specific and to a lesser extent soil type specific. In addition, the amount of organic 'acid sorption was strongly dependent upon the cation balancing the organic acid anion (i. e. H+ or K+). I also demonstrated that CaCO3 is a binding site for oxalate and to a lesser extent citrate in soil. The biodegradation of oxalate and citrate was fast in soil although citrate tended to be mineralized faster. When investigating the sorption and desorption reactions of organic acids in calcareous soils, the sorption of oxalate was much greater that of citrate. The amount of organic acid desorbed from the solid phase was dependent on ionic strength and composition of the desorption solution. In comparison to citrate, more oxalate could be desorbed from the soil, depending upon the initial amount of oxalate added to the soil. In addition, the test soils were extracted with organic acid solutions of different concentrations for different time periods and the amount of Fe, Mn, Zn, Cu, P and Ca mobilization into solution measured. The results showed that the presence of organic acids significantly affects the concentration of metals and anions in soil solution. Generally, organic acid concentrations >1 mM were required to mobilize nutrients into solution. Citrate tended to be more effective than oxalate at mobilizing nutrients from the soil. In most cases the mobilization was not transient and elevated levels of nutrients were seen in solution for up to 6 h after addition of the organic acids. The effects of three different organic acid application methods on the availability and uptake of P and micronutrients in wheat was also investigated. The study showed that wheat plants treated with organic acids accumulated significantly higher concentrations and amounts of micronutrients than the untreated control plants. Foliar application of organic acid without any Zn treatment proved the most effective method of increasing Fe uptake into wheat leaves. The effects of organic acids on the availability and uptake of P from the wheat rhizosphere was studied to determine the importance of organic acid type and concentration on 33P uptake by shoots. The results showed that elevated concentrations of organic acids in the rhizosphere significantly enhanced shoot 33P accumulation, while citrate was much less effective at stimulating 33P uptake. In the absence of microorganisms, both organic acids were capable of mobilizing P from the soil particularly at concentration >1 mM. Citrate mineralization by soil microorganisms proceeded at a higher rate than oxalate mineralization. Overall, the presence of organic acids significantly affects the concentration of metals in soil solution and this mobilization is dependent upon the type of organic acid, its ionic form, its concentration, reaction time and the type of soil. The response of wheat plants to different methods of organic acid addition proved variable. Organic acids did result in an increase in metal mobilization and plant uptake. In particular, oxalate resulted in a significant enhancement in plant P. This work presents evidence to show that organic acids may be important in nutrients acquisition in calcareous soils.

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Myers, Eddie Leonard. "Heterocyclic aromatic nucleic acids". Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79056.

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In order to investigate the role played by the aromatic moiety of Aromatic Peptide Nucleic Acids (APNAs) in their ability to hybridize with RNA and DNA, as well as improve the solubility of APNA oligomers in aqueous solutions, a new generation of heterocyclic monomers were designed. APNA monomers, where the nucleobase can be thymine, cytosine adenine or guanine, with backbones contain thiophene and pyridine moieties were synthesized. Suitably protected APNA-APNA and PNA-APNA dimers were also synthesized as building blocks for the solid phase synthesis of APNA-PNA chimeras and APNA homopolymers. Due to the instability of the pyridine-containing APNA oligomers to the harsh acidic conditions required to cleave oligomers from the MBHA resin, a new protocol was developed for the synthesis of these molecules on the trityl chloride resin. Oligomers of PNA and APNA-PNA chimeras were successfully synthesized on this solid support, and cleaved from the resin using mild acidic conditions.

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Buttery, C. D. "Metallations of heterocylic acids". Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353564.

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Cai, Chaozhong. "Asymmetric synthesis of chi-constrained pyroglutamic acids, glutamic acids and prolines for peptides and peptidomimetics". Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/280129.

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The recent upsurge of interest in the peptide-based drug molecules has been accompanied by a great deal of attention to the design of stereochemically defined non-proteinogenic amino acids. As a continuous effort to develop efficient syntheses of χ-constrained amino acids in our group, we recently have developed a practical methodology for the asymmetric synthesis of substituted pyroglutamic acid, glutamic acid and proline analogues, which are of important use in examining the relationships between conformation and bioactivities of biologically important peptides (e.g. DPDPE, α-MSH). The key step in this method is an asymmetric Michael addition reaction between a chiral Ni(II)-complex of the glycine Schiff base (S)-NiGlyBPB, and derivatives of α,β-unsaturated carboxylic acids. This new method is the first highly diastereoselective, room temperature, organic base-catalyzed, asymmetric Michael addition reaction. Excellent chemical yields and diastereoselectivity, along with the simplicity of experimental procedure, renders the present method of immediate use for preparation of various novel beta-substituted pyroglutamic acids, glutamic acids and prolines. Decomposing the resulting addition products in acidic medium, followed by neutralizing with ammonia, gave optically pure substituted pyroglutamic; acids in good yields (>80%). The substituted pyroglutamic acids were converted to the corresponding substituted glutamic acids by hydrolysis in 6N HCl, or to substituted proline analogues by selective reduction of amide carbonyl group to a methylene group. Both novel substituted glutamic acids and prolines are being incorporated into biologically important peptide MT-II analogues for structure-activity studies.

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Starkov, P. "Applications of boronic acids in organic synthesis". Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1302408/.

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This thesis describes progress on the application of boronic acids and borate esters as catalysts and reagents in synthetic organic chemistry, focusing on two areas: one-pot enolate formation/aldol reactions and amide bond formation. Chapter 1 introduces the reader to boronic acids and derivatives thereof, their methods of preparation and their use in synthetic organic chemistry as reactants, reagents and catalysts. Chapter 2 covers current chemical methods and cellular alternatives for amide bond formation. Here, we also discuss our use of boron reagents for the activation of carboxylic acids as well as amides. Chapter 3 introduces a new concept in catalytic aldol reactions, i.e. an alternative strategy to access boron enolates in situ. The work covers successful demonstration of the feasibility of such an approach on an intramolecular system. A novel variation of aerobic Chan–Evans– Lam coupling, an intramolecular coupling of an aliphatic alcohol with a boronic acid using catalytic copper, is also introduced Chapter 4 builds on our observations on gold catalysis and especially that in relation to electrophilic halogenations. Chapter 5 contains full details of the experimental procedures.

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Toom, Lauri. "Bispidine Derivatives : Synthesis and Interactions with Lewis Acids". Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Universitetsbiblioteket [distributör], 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6735.

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Patience, J. M. "Routes to substituted tetramic acids". Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235998.

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Libri sul tema "Organic acids"

Ya, Boykov P., e Selyanin, M. A. (Michael A.), a cura di. Hyaluronic acid: Preparation, properties, application in biology and medicine. Chichester, West Sussex: John Wiley & Sons, Inc., 2015.

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Theron, Maria M. Organic acids and food preservation. Boca Raton: Taylor & Francis, 2011.

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Pittman, Edward D., e Michael D. Lewan, a cura di. Organic Acids in Geological Processes. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78356-2.

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Hisashi, Yamamoto, a cura di. Lewis acids in organic synthesis. Weinheim: Wiley-VCH, 2000.

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Hisashi, Yamamoto, a cura di. Lewis acids in organic synthesis. Weinheim: Wiley-VCH, 2000.

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Hisashi, Yamamoto, a cura di. Lewis acids in organic synthesis. Weinheim: Wiley-VCH, 2000.

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Hisashi, Yamamoto, a cura di. Lewis acids in organic synthesis. Weinheim: Wiley-VCH, 2000.

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D, Pittman Edward, e Lewan M. D. 1948-, a cura di. Organic acids in geological processes. Berlin: Springer-Verlag, 1994.

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Madronova, Libuse. Humic acids from raw materials of the Czech Republic. New York: Nova Science Publishers, 2011.

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Mizuno, Yoshihisa. The organic chemistry of nucleic acids. Tokyo: Kodansha, 1986.

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Capitoli di libri sul tema "Organic acids"

de Almeida, Isabel Tavares, e Marinus Duran. "Organic Acids". In Physician's Guide to the Diagnosis, Treatment, and Follow-Up of Inherited Metabolic Diseases, 761–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40337-8_50.

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Calvel, Raymond. "Organic Acids". In The Taste of Bread, 49–54. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4757-6809-1_5.

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Nuttall, Kern L., e Norberto A. Guzman. "Organic Acids". In Clinical and Forensic Applications of Capillary Electrophoresis, 193–208. Totowa, NJ: Humana Press, 2001. http://dx.doi.org/10.1007/978-1-59259-120-6_10.

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Taylor, T. Matthew, e Stephanie X. Doores. "Organic Acids". In Antimicrobials in Food, 133–90. Fourth edition. | Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780429058196-5.

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Tavares de Almeida, Isabel, e Antonia Ribes. "Organic Acids". In Physician's Guide to the Diagnosis, Treatment, and Follow-Up of Inherited Metabolic Diseases, 51–64. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-67727-5_4.

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Zhang, Huimin, e Lloyd E. Metzger. "Organic Acids". In Handbook of Dairy Foods Analysis, 293–306. 2^a ed. Second edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429342967-13.

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Vollhardt, Peter, e Neil Schore. "Carboxylic Acids". In Organic Chemistry, 1461–547. New York: Macmillan Learning, 2014. http://dx.doi.org/10.1007/978-1-319-19197-9_19.

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Tucker, William B. "Carboxylic Acids". In Organic Chemistry, 228–36. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003479352-20.

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Vollhardt, Peter, e Neil Schore. "Amino Acids, Peptides, Proteins, and Nucleic Acids". In Organic Chemistry, 2013–111. New York: Macmillan Learning, 2014. http://dx.doi.org/10.1007/978-1-319-19197-9_26.

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Tucker, William B. "Acids and Bases". In Organic Chemistry, 109–17. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003479352-10.

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Atti di convegni sul tema "Organic acids"

Buijse, Marten, Peter de Boer, Bert Breukel, Monique Klos e Gerardo Burgos. "Organic Acids in Carbonate Acidizing". In SPE European Formation Damage Conference. Society of Petroleum Engineers, 2003. http://dx.doi.org/10.2118/82211-ms.

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Chang, Frank Fakuen, Hisham A. Nasr-El-Din, T. Lindvig e X. W. Qui. "Matrix Acidizing of Carbonate Reservoirs Using Organic Acids and Mixture of HCl and Organic Acids". In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2008. http://dx.doi.org/10.2118/116601-ms.

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Deng, X., M. S. Kamal, S. Patil, S. M. Shakil, E. A. Shalabi e A. Hassan. "Impact of Spacer Structure on Organic Acids Desorption Efficiency Induced by Gemini Surfactants". In GOTECH. SPE, 2024. http://dx.doi.org/10.2118/219216-ms.

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Abstract Organic acids, together with other polar molecules, constitute the oil-wetting components in crude oil. A commonly adopted understanding is that the adsorption of organic acids leads to the further adsorption of organic materials on the hydrophobic tail groups of the adsorbed organic acid molecules, making the rock surface oil-wet. Although the impact of organic acids in oil-wetting of the rock surface has been unfolded for many different conditions, there are still some questions around the oil-wetting reactions induced by organic acids. A group of in-house synthesized cationic gemini surfactants have been shown effective in altering rock wettability from oil-wet to water-wet conditions. To study the impact of spacer structure on organic acids desorption, experiments were taken to show the impact of the water film in the oil-wetting process of rock by organic acids, and the effectiveness of different cationic gemini surfactants in wettability alteration. SEM and zeta potential experiments were conducted to show the adsorption and desorption of organic acids. Static contact angle measurements were conducted to show the wettability change. Difference in the wettability alteration performance was closely related with the spacer structure. Results showed that polarity of the spacer group is not the only factor that impacts the surfactant's potential in changing rock wettability.

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Ray, Paresh Chandra. "First hyperpolarizabilities of weak organic acids". In 17th Congress of the International Commission for Optics: Optics for Science and New Technology. SPIE, 1996. http://dx.doi.org/10.1117/12.2316071.

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Ninan, Chinnu Mariam, Ramu Radhakrishnan, K. P. Ramaswamy e R. Sajeeb. "Investigation on Aggressiveness of Organic Acids on Degradation of Ordinary Portland Cement Mortar". In 6th International Conference on Modeling and Simulation in Civil Engineering. AIJR Publisher, 2023. http://dx.doi.org/10.21467/proceedings.156.4.

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Vulnerability of concrete when exposed to low pH acidic environment is a phenomenon known for its significance in the durability of concrete structures. These hostile low pH acidic conditions attack the cement paste and disrupts the equilibrium of the matrix. Mortar specimens prepared with ordinary Portland cement (OPC) responds differently to various organic acid solutions. This study examines the acid aggressiveness on degradation of OPC mortar specimens exposed to 10% concentration lactic acid, acetic acid, citric acid and propionic acid. Acids with higher aggressiveness exhibits higher degradation. This paper compares the effects of different organic acids on cement mortar specimens in terms of mass changes, compressive strength changes and pulse velocity changes. Propionic acid and acetic acid show lower acid aggressiveness comparing to citric acid and lactic acid. Citric acid exhibits a consistency in its degradation and is of higher magnitude. The investigation of aggressiveness of organic acids on OPC mortar aids in predicting degradation to structures on acid exposure and hence preventing the eventual failure of the structure.

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Seijas, Julio, M. Vàsquez-Tato e M. Martinez. "Synthesis of 2-Alkylbenzoic Acids: Alkyllithium Additions to 2-Vinylbenzoic Acid". In The 2nd International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 1998. http://dx.doi.org/10.3390/ecsoc-2-01671.

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Ali, Bakhat, Hélio A. Stefani e Fernando P. Ferreira. "Addition of Amino Acids to oxopyrrolidin compounds". In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_20131014161751.

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Elsheikh, Ellewa Ahmed, Taha Moawad, Ali Alnetaifi, Abdulrahman AlQuraishi e Yusuf Almutawea. "Evaluation of Organic Acids Implementation in Stimulating Tight Gas Reservoirs: A Case Study on Sarah Sandstone Formation". In SPE Conference at Oman Petroleum & Energy Show. SPE, 2022. http://dx.doi.org/10.2118/200242-ms.

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Abstract Sandstone formations are yet stimulated with mud acid when matrix acidizing is most competent. In terms of high-pressure high-temperature (HP-HT) conditions, the corrosive impact of hydrochloric (HCl) acid prompted the need to explore other alternatives to mud acid. This study examines the efficiency of organic acids in stimulating Sarah sandstone, a tight gas formation of potential. Two Berea cores were first exploited to investigate the optimum and most efficient injected acid volume. The mineralogy of Sarah formation was identified using X-ray diffraction (XRD) aided by Scanning Electron Microscopy (SEM). Formation mineralogy led to the selection of acetic-HF and oxalic-HF as proper acids for stimulation experiments. Bentonite water-base mud was used to alter the permeability of three fresh Sarah sandstone core samples. The organic-HF acids were used to stimulate two core samples, while mud acid was tested in the third core for comparison. Energy-dispersive X-ray spectrometer (EDX) and SEM were utilized to study the impact of acids on porous media. Experiments conducted in Berea core samples led to the execution of five pore volumes (PV) of preflush and one PV of main treatment as the optimum volume during the acidizing trials. XRD and SEM identified pore-filling clay minerals causing the low permeability of Sarah formation. Furthermore, the water-base mud injected decreased the permeability further by 80%. Oxalic-HF and acetic-HF mixtures recovered the initial permeability of core samples by 46% and 35% respectively. SEM-EDX results showed how organic acids have partially unblocked the pathways of the structural pores leading to permeability enhancement. This research not only recommends the use of oxalic-HF acid for acidizing Sarah sandstone formation but also spotlights the ability of organic acids employment as preflush in hydraulic fracturing operations.

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Gonçalves, M., S. A. Barros, Vânia Frade e João Moura. "Fluorescence Derivatisation of Amino Acids". In The 9th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2005. http://dx.doi.org/10.3390/ecsoc-9-01478.

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Czollner, Laszlo, Dirk Classen-Houben, Paul Kosma, M. C. Del Ruiz-Ruiz, Hassan Amer, Christian Stanetty, Ulrich Jordis e Igor Beseda. "Ugi reactions of tertiary carboxylic acids: Combinatorial synthesis of glycyrrhetinic acid derivatives". In The 13th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2009. http://dx.doi.org/10.3390/ecsoc-13-00200.

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Rapporti di organizzazioni sul tema "Organic acids"

Cruz Barrera, Mauricio, Martha Isabel Gómez, Carlos Andrés Moreno e Bettina Eichler Loberman. Strains of Trichoderma spp. and their Capacity to Mobilize Phosphorus. Corporación Colombiana de Investigación Agropecuaria - AGROSAVIA, 2016. http://dx.doi.org/10.21930/agrosavia.reporte.2016.63.

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Soil microorganisms enhance the plant availability of phosphorus (P). This ability is related to the production of organic acids and the activity of phosphatases. It is assumed that the production of organic acids solubilize insoluble phosphate forms to usable form such as orthophosphate, increasing its potential availability to plants (Vázquez et al. 2000). Filamentous fungi such as Trichoderma sp. have advantages in acid soils presenting morphological and metabolic characteristics that make them promising organisms (Nahas, 1996; Vera et al, 2002). On the other hand, inoculation of soil with phosphate solubilizing fungi has been shown to increase yields in crops like maize and wheat (Singh and Reddy, 2011), beans (Wahid and Mehana, 2000), chickpea (Kapri and Tewari, 2010).

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Fields, Nathan, Dennis J. Miller, Navinchandra S. Asthana, Aspi K. Kolah, Dung Vu e Carl T. Lira. Reactive Distillation for Esterification of Bio-based Organic Acids. Office of Scientific and Technical Information (OSTI), settembre 2008. http://dx.doi.org/10.2172/937553.

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Singh, Anjali. Amino Acids: Building Blocks of Proteins. ConductScience, giugno 2022. http://dx.doi.org/10.55157/cs20220612.

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Amino acids are essential organic compounds serving as protein building blocks. Recognized for their biological roles, they underpin proteins' structure and interactions. Classified by polarity and nutritional necessity, essential amino acids, not synthesized by the body, include histidine, leucine, lysine, and more, while non-essential ones are produced internally. These molecules exhibit diverse functions, from neurotransmitter precursor synthesis to immune support. Industries leverage amino acids in animal feed, artificial sweeteners, flavor enhancers, and drug manufacturing, highlighting their vital role in various applications beyond biological systems.

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Klasson, K. T. Direct Capture of Organic Acids From Fermentation Media Using Ionic Liquids. Office of Scientific and Technical Information (OSTI), novembre 2004. http://dx.doi.org/10.2172/861707.

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Miller, Anneka, Stehpen Mezyk e Dean Peterman. Evaluate the role of organic acids in the protection of ligands from radiolytic degradation. Office of Scientific and Technical Information (OSTI), agosto 2016. http://dx.doi.org/10.2172/1389191.

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Ozkan, Gursel. Phenolic Compounds, Organic Acids, Vitamin C and Antioxidant Capacity in Prunus spinosa L. Fruits. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, febbraio 2019. http://dx.doi.org/10.7546/crabs.2019.02.17.

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Li, Jie. Methods development for separation of inorganic anions, organic acids and bases, and neutral organic compounds by ion chromatography and capillary electrophoresis. Office of Scientific and Technical Information (OSTI), aprile 1999. http://dx.doi.org/10.2172/354894.

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Starr, John N. Water-enhanced solubility of carboxylic acids in organic solvents and its applications to extraction processes. Office of Scientific and Technical Information (OSTI), novembre 1991. http://dx.doi.org/10.2172/10146497.

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Starr, J. N., e C. J. King. Water-enhanced solubility of carboxylic acids in organic solvents and its applications to extraction processes. Office of Scientific and Technical Information (OSTI), novembre 1991. http://dx.doi.org/10.2172/5273252.

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Gazzo, David Vincent, e David W. Reed. Optimization of a Lithium Ion Battery Bioleaching Process Utilizing Organic Acids Produced by Gluconobacter oxydans. Office of Scientific and Technical Information (OSTI), luglio 2019. http://dx.doi.org/10.2172/1546738.

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