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Journal articles on the topic 'Maleic acids'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Nunes, Fabrize Caroline, Mário Miyazawa, and Marcos Antonio Pavan. "Organic acid effect on calcium uptake by the wheat roots." Brazilian Archives of Biology and Technology 52, no. 1 (2009): 11–15. http://dx.doi.org/10.1590/s1516-89132009000100002.

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This work evaluated the effect of the natural organic acids on the uptake of Ca by the wheat roots in a hydroponic solution. The following organic acids were evaluated: citric, oxalic, tartaric, malic, malonic, maleic, DL-malic, p-hydroxybenzoic, aconitic, and salicilic. The organic acids neither enhanced the root growth nor increased Ca uptake. The salicilic and malic acids were highly toxic and decreased the root growth. The citric, tartaric, maleic, aconitic, and salicilic decreased the Ca uptake by the roots due to their higher capacity to form the stable complexes with Ca in solution at p

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2

Sato, Kei, Fumikazu Ikemori, Sathiyamurthi Ramasamy, et al. "Four- and Five-Carbon Dicarboxylic Acids Present in Secondary Organic Aerosol Produced from Anthropogenic and Biogenic Volatile Organic Compounds." Atmosphere 12, no. 12 (2021): 1703. http://dx.doi.org/10.3390/atmos12121703.

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To better understand precursors of dicarboxylic acids in ambient secondary organic aerosol (SOA), we studied C4–C9 dicarboxylic acids present in SOA formed from the oxidation of toluene, naphthalene, α-pinene, and isoprene. C4–C9 dicarboxylic acids present in SOA were analyzed by offline derivatization gas chromatography–mass spectrometry. We revealed that C4 dicarboxylic acids including succinic acid, maleic acid, fumaric acid, malic acid, DL-tartaric acid, and meso-tartaric acid are produced by the photooxidation of toluene. Since meso-tartaric acid barely occurs in nature, it is a potential

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3

Salama, A. M., J. R. Hicks, and J. F. Nock. "Sugar and Organic Acid Changes in Stored Onion Bulbs Treated with Maleic Hydrazide." HortScience 25, no. 12 (1990): 1625–28. http://dx.doi.org/10.21273/hortsci.25.12.1625.

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Maleic hydrazide (MH)-treated and untreated (control) onion (Allium cepa L.) bulbs were stored for up to 20 weeks at 0, 15, or 30C with relative humidities (RH) of 40% or 60%. MH and RH had minimal effect on sugars and organic acids in inner or outer scale leaves that were analyzed at S-week intervals. Concentrations of fructose, glucose, and total sugars were higher in inner than outer leaves of the bulb, while the reverse was true for sucrose. Total sugars, glucose, and fructose decreased and sucrose increased with higher storage temperature. Total sugars and glucose decreased with increased

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4

Teitei, T. "The Synthesis of (3'-Oxo-3',4'-Dihydro-2'h-1',4'-Benzothiazin-2'-Yl)Acetic Acid and (3'-Oxo-3',4'-Dihydro-2'h-1',4'-Benzoxazin-2'-Yl)Acetic Acid-Derivatives." Australian Journal of Chemistry 39, no. 3 (1986): 503. http://dx.doi.org/10.1071/ch9860503.

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Reaction of o-aminophenol with various maleic anhydrides gave first 2-hydroxymaleanilic acids (4-(2′-hydroxyphenylamino)-4-oxobut-2-enoic acids) (1), which were then converted into the 3-oxo-1,4-benzoxazines (2d-h) and (3f-1) under mild basic conditions; similarly the reaction of o- aminothiophenol with the maleic anhydrides gave the 3-oxo-1,4-benzothiazines (2a), (3a) and (3d) in one step. The facile cycloaddition and esterification of 2-hydroxymaleanilic acids to form the benzoxazines observed in this work is discussed in terms of the formation of the isomaleimide type intermediate (7).

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5

Kolyamshin, O. A., Yu N. Mitrasov, V. A. Danilov, Yu Yu Pylchikova, and A. A. Avruyskaya. "Synthesis and some transformations of 4-(2,5-dihydro-2,5dioxo-1<i>h</i>-pyrrrol-1-yl)benzoic and -phenylacetic acids amides." Журнал общей химии 93, no. 2 (2023): 173–78. http://dx.doi.org/10.31857/s0044460x23020026.

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The reactions of 4-aminobenzoic and 4-aminophenylacetic acids amides with maleic anhydride yielded the corresponding monoamides of maleic acid, the cyclization of which gave amides of 4-(2,5-dihydro-2,5-dioxo1 H -pyrrol-1-yl)benzoic and 4-(2,5-dihydro-2,5-dioxo-1 H -pyrrol-1-yl)phenylethanoic acids. Their reactions with secondary amines afforded the corresponding 4-(3-dialkylamino-2,5-dioxo-2,3,4,5-tetrahydro-1 H -pyrrol-1-yl) benzoic and 4-(3-dialkylamino-2, 5-dioxo-2,3,4,5-tetrahydro-1 H -pyrrol-1-yl)phenylethanoic acids amides.

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6

MILLER, ARTHUR J., and JEFFREY E. CALL. "Inhibitory Potential of Four-Carbon Dicarboxylic Acids on Clostridium botulinum Spores in an Uncured Turkey Product." Journal of Food Protection 57, no. 8 (1994): 679–83. http://dx.doi.org/10.4315/0362-028x-57.8.679.

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Organic acids offer promising options for the food industry in its attempt to ensure product safety and to meet consumer demand for minimally processed foods. In this study, four-carbon dicarboxylic acids were individually screened for their inhibitory potential against proteolytic Clostridium botulinum spores. Ground turkey breast meat was formulated with 1.4% sodium chloride (NaCl), 0.3% sodium pyrophosphate, 2% organic acid, 8% water and 500 spores/g of a six-strain mixture of proteolytic C. botulinum. Samples were adjusted to pH 6. Ten g of product in vacuum packages were heated in 75°C wa

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7

Cascaval, Dan, Anca-Irina Galaction, and Corneliu Oniscu. "Modeling of the selective pertraction of carboxylic acids obtained by citric fermentation." Chemical Industry 58, no. 3 (2004): 97–103. http://dx.doi.org/10.2298/hemind0403097c.

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Facilitated pertraction was applied for the selective separation of citric, maleic and succinic acids from a mixture obtained by citric fermentation. The pertraction equipment included a U-shaped cell containing 1,2-dichloro-ethane as the liquid membrane and Amberlite LA-2 as the carrier. The experimental data indicated that maleic and succinic acids can be initially selectively separated from citric acid, followed by the selectively separation of maleic acid from succinic acid. Using statistical analysis and a second order factorial experiment, two mathematical correlations describing the inf

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8

Liu, Borui, Qing Huang, Yuefeng Su, et al. "Maleic, glycolic and acetoacetic acids-leaching for recovery of valuable metals from spent lithium-ion batteries: leaching parameters, thermodynamics and kinetics." Royal Society Open Science 6, no. 9 (2019): 191061. http://dx.doi.org/10.1098/rsos.191061.

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Environmentally friendly acid-leaching processes with three organic acids (maleic, glycolic and acetoacetic) were developed to recover valuable metals from the cathodic material of spent lithium-ion batteries (LiCoO 2 ). The leaching efficiencies of Li and Co by the maleic acid were 99.58% and 98.77%, respectively. The leaching efficiencies of Li and Co by the glycolic acid were 98.54% and 97.83%, while those by the acetoacetic acid were 98.62% and 97.99%, respectively. The optimal acid concentration for the maleic acid-, glycolic acid- and acetoacetic acid-leaching processes were 1, 2 and 1.5

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9

Vida, Norbert, Jiří Václavík, and Petr Beier. "Synthesis and reactivity of aliphatic sulfur pentafluorides from substituted (pentafluorosulfanyl)benzenes." Beilstein Journal of Organic Chemistry 12 (January 20, 2016): 110–16. http://dx.doi.org/10.3762/bjoc.12.12.

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Oxidation of 3- and 4-pentafluorosulfanyl-substituted anisoles and phenols with hydrogen peroxide and sulfuric acid provided a mixture of SF5-substituted muconolactone, maleic, and succinic acids. A plausible mechanism for the formation of the aliphatic SF5 compounds was presented and their chemical reactivity was investigated. SF5-substituted para-benzoquinone was synthesized; its oxidation led to an improved yield of 2-(pentafluorosulfanyl)maleic acid. The reaction of SF5-substituted maleic anhydride and para-benzoquinone with cyclopentadiene afforded the Diels–Alder adducts. Decomposition o

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10

Klimoszek, Daria, and Alina Pyka-Pająk. "Lipophilicity Study of Fumaric and Maleic Acids." Processes 11, no. 4 (2023): 993. http://dx.doi.org/10.3390/pr11040993.

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The experimental lipophilicity of fumaric acid (FA) and maleic acid (MA) using the traditional shake-flask method in an n-octanol–water system using reversed-phase thin-layer chromatography (RP-TLC) was determined. Experimental partition coefficients (logPexp) were equal to −0.65 and 0.63 for MA and FA, respectively. The chromatographic lipophilicity (RMW) of the FA and MA was evaluated using reversed-phase thin-layer chromatography on RP8F254s, RP18WF254, and CNF254s plates with a mixture of an organic solvent (methanol or dioxane) and water as the mobile phase. All applied chromatographic co

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11

Wei, Zhongjin, Fengshan Zhou, Sinan Chen, and Hongxing Zhao. "Composition, Properties, and Utilization of Fumaric Acid Sludge By-Produced from Industrial Phthalic Anhydride Wastewater Treatment." Polymers 14, no. 23 (2022): 5169. http://dx.doi.org/10.3390/polym14235169.

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To understand fumaric acid sludge (FAS) systematically and comprehensively and find out how to utilize it, we conducted a series of characterization analyses on FAS. Fourier transform infrared (FT-IR) Spectra shows that the main component of FAS is fumaric acids and also contains a small amount of silicate. The nuclear magnetic resonance hydrogen (1H-NMR) spectrum also shows that fumaric acid accounted for a large proportion of FAS. The X-ray diffraction (XRD) shows that the main phase in FAS is fumaric acid, and there is also a small amount of Kaliophilite. After gas chromatography and mass s

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12

Hyvärinen, Antti-Pekka, Heikki Lihavainen, Anca Gaman, et al. "Surface Tensions and Densities of Oxalic, Malonic, Succinic, Maleic, Malic, andcis-Pinonic Acids." Journal of Chemical & Engineering Data 51, no. 1 (2006): 255–60. http://dx.doi.org/10.1021/je050366x.

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13

Cabelli, Diane E., and Benon H. J. Bielski. "A Pulse Radiolysis Study of Some Dicarboxylic Acids of the Citric Acid Cycle. The Kinetics and Spectral Properties of the Free Radicals Formed by Reaction with the OH Radical." Zeitschrift für Naturforschung B 40, no. 12 (1985): 1731–37. http://dx.doi.org/10.1515/znb-1985-1223.

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Abstract The reactions between the OH radical and fumaric acid, maleic acid, malic acid and succinic acid were studied using pulse radiolysis techniques. The rates of reaction, the absorption spectra of the resultant free radicals and the rates of disappearance of those radicals were determined as a function of pH over virtually the entire pH range (pH 2-14)

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14

Mageet, Adil Osman, Cristin Saber Aziz, Maab Adil Osman, and Rula Hasan Al-Haideri. "The Effect of Surface Treatments on Shear Bond Strength between Orthodontic Metal Bracket and Porcelain Face." Azerbaijan Pharmaceutical and Pharmacotherapy J 23, no. 1 (2024): 22–29. http://dx.doi.org/10.61336/appj/23-1-5.

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Objectives: To report on the different approaches taken to improve the bonding of orthodontic brackets to porcelain surfaces and review the literature and test the available alternatives of hydrofluoric acid use. Materials and Methods: The search engine PubMed, Scopus, Google Scholar and Science Direct were used for this study to obtain relevant information. The sample comprises 18 Porcelain fused to metal crowns, etchant acids like Hydrofluoric Acid 9.6%; Orthophosphoric Acid 37%; Maleic Acid 10, 20, 30%. Acrylic tooth holder, high-speed hand piece, round bur, bonding agent, composite, bracke

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15

Stepanovs, D., M. Jure, A. Yanichev, S. Belyakov, and A. Mishnev. "Molecular salts of propranolol with dicarboxylic acids: diversity of stoichiometry, supramolecular structures and physicochemical properties." CrystEngComm 17, no. 47 (2015): 9023–28. http://dx.doi.org/10.1039/c5ce01408e.

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16

Colmenero, Francisco. "Organic acids under pressure: elastic properties, negative mechanical phenomena and pressure induced phase transitions in the lactic, maleic, succinic and citric acids." Materials Advances 1, no. 5 (2020): 1399–426. http://dx.doi.org/10.1039/d0ma00019a.

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The behavior under pressure of the lactic, maleic, succinic and citric acids is studied using first principles methods. The four acids exhibit NLC effects due to the onset of pressure induced phase transitions or sudden structural rearrangements.

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17

Varga, Z., G. Kiss, and H. C. Hansson. "Modelling the cloud condensation nucleus activity of organic acids." Atmospheric Chemistry and Physics Discussions 7, no. 2 (2007): 5341–64. http://dx.doi.org/10.5194/acpd-7-5341-2007.

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Abstract. In this study vapour pressure osmometry was used to determine water activity in solutions of organic acids. The surface tension of the solutions was also monitored in parallel and then Köhler curves were calculated for nine organic acids (oxalic, malonic, succinic, glutaric, adipic acid, maleic acid, malic acid, citric acid and pinonic acid). Surface tension depression is negligible for most of the organic acids in dilute (≤1 w/w%) solutions. Therefore, these compounds affect the supersaturation only in the beginning phase of droplet formation but not necessarily at the critical size

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18

Bowes, Katharine F., George Ferguson, Alan J. Lough, and Christopher Glidewell. "Salts of maleic and fumaric acids with organic polyamines: comparison of isomeric acids as building blocks in supramolecular chemistry." Acta Crystallographica Section B Structural Science 59, no. 1 (2003): 100–117. http://dx.doi.org/10.1107/s0108768102020219.

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Maleic acid and fumaric acid both readily form adducts with organic diamines: maleic acid usually forms 2:1 adducts with bases, while fumaric acid usually forms 1:1 adducts, and the supramolecular stuctures within the two series are not simply related. The 1:2 adducts formed by 1,2-bis(4-pyridyl)ethane and by 4,4′-bipyridyl, respectively, with maleic acid, compounds (1) and (2), are salts [{(diamine)H2}2+]·[(C4H3O4)−]2 in which the cations lie across a centre of inversion and a twofold rotation axis, respectively. The ions are linked by N—H...O hydrogen bonds into three-ion aggregates, which a

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19

Papraćanin, Edisa, Abdel Đozić, Ermin Mujkić, et al. "Separation of Fumaric and Maleic Acid Crystals from the Industrial Wastewater of Maleic Anhydride Production." Hungarian Journal of Industry and Chemistry 50, no. 2 (2022): 1–6. http://dx.doi.org/10.33927/hjic-2022-10.

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In this research, a physicochemical analysis of the industrial wastewater from a factory that produces maleic anhydride was performed. Based on the conducted analysis (pH, electrical conductivity, density of the liquid phase, boiling point of the waste suspension, chemical as well as biological oxygen demand, and dry matter), it can be concluded that the waste stream obtained at the outlet pipe from the plant resulting from the production of maleic anhydride requires appropriate treatments. Some of the parameters measured, e.g. pH (0.97±0.06), boiling point (106.8±1.3°C) and acidity, indicate

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20

Carvalho, Paulo S., Luan F. Diniz, Juan C. Tenorio, et al. "Pharmaceutical paroxetine-based organic salts of carboxylic acids with optimized properties: the identification and characterization of potential novel API solid forms." CrystEngComm 21, no. 24 (2019): 3668–78. http://dx.doi.org/10.1039/c8ce02076k.

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21

Egberts, Jan-Hendrik, Ghulam Shere Raza, Cornelia Wilgus, Stefan Teyssen, Karlheinz Kiehne, and Karl-Heinz Herzig. "Release of Cholecystokinin from Rat Intestinal Mucosal Cells and the Enteroendocrine Cell Line STC-1 in Response to Maleic and Succinic Acid, Fermentation Products of Alcoholic Beverages." International Journal of Molecular Sciences 21, no. 2 (2020): 589. http://dx.doi.org/10.3390/ijms21020589.

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Alcoholic beverages stimulate pancreatic enzyme secretions by inducing cholecystokinin (CCK) release. CCK is the major stimulatory hormone of pancreatic exocrine secretions, secreted from enteroendocrine I-cells of the intestine. Fermentation products of alcoholic beverages, such as maleic and succinic acids, influence gastric acid secretions. We hypothesize that maleic and succinic acids stimulate pancreatic exocrine secretions during beer and wine ingestion by increasing CCK secretions. Therefore, the effects of maleic and succinic acids on CCK release were studied in duodenal mucosal cells

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22

Sun, Chuanyu, and Yu Wang. "Preparation of polyaniline nanostructures doped with different dicarboxylic acids through template-free method." Materials Science-Poland 32, no. 3 (2014): 419–22. http://dx.doi.org/10.2478/s13536-014-0221-1.

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AbstractIn this article nanoscaled polyanilines (PANI) were prepared based on template-free method in the presence of dicarboxylic acid dopants (e.g. D-tartaric acid, succinic acid, maleic acid and fumaric acid). The trans-cis isomerization of butenedioic acid played an important role in the formation of nanostructures from the plane-like to nanofibers, and the PANI doped with maleic acid (MA) had larger diameter, higher crystallinity and conductivity than PANI doped with fumaric acid (FA).

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23

Jokic, Anja, Radmila Dzudovic, Ljiljana Jaksic, and Snezana Nikolic-Mandic. "The application of hydrogen-palladium electrode for potentiometric acid-base determinations in tetrahydrofuran." Journal of the Serbian Chemical Society 78, no. 8 (2013): 1203–12. http://dx.doi.org/10.2298/jsc120927018j.

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The application of the hydrogen-palladium electrode (H2/Pd) as the indicator electrode for the determination of relative acidity scale (Es, mV) of tetrahydrofuran (THF) and the potentiometric titrations of acids in this solvent was investigated. The relative acidity scale tetrahydrofuran was determined from the difference half-neutralization potentials of perchloric acid and tetrabutylammonium hydroxide (TBAH), which were measured by using both H2/Pd-SCE and glass-SCE electrode pairs. The experimentally obtained value of Es scale THF with a H2/Pd-SCE electrode pair was 1155 mV, and those obtai

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24

Sigmundová, Ivica, and Mária Mečiarová. "Synthesis of New 2-Hydrazono-4-oxo-5-thiazolidineacetic Acids and Their Alkylamides." Collection of Czechoslovak Chemical Communications 62, no. 1 (1997): 124–29. http://dx.doi.org/10.1135/cccc19970124.

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The direct two step synthesis of three new 2-hydrazono-4-oxo-5-thiazolidineacetic acids from thiosemicarbazide, the appropriate ketones (acetophenone, cyclopentanone, cyclohexanone) and maleic anhydride is described. The prepared acids were transformed, via their mixed anhydrides with ethyl carbonate, into their alkylamides in a one-pot procedure.

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Habibie, Sudirman. "Chelation and Metal-Ion Complex Formation of Chitosan Treated Cotton." Majalah Ilmiah Pengkajian Industri 8, no. 3 (2019): 93–100. http://dx.doi.org/10.29122/mipi.v8i3.3652.

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Chitin dan chitosan adalah bahan â€œchelateâ€ yang sangat kuat untuk ion transisi logam terutama tembaga, nikel dan merkuri, dan sifat-sifat ini yang akan intensif di bahas. Pada studi ini kain kapas (cotton) dikerjakan dengan larutan chitosan-asam polikarboksilat untuk memperoleh kain kapas-chitosan yang mengandung gugus group karboksilat (-COOH) dan gugus amina (-NH2) fungsional. Penggunaan asam polykarboksilat (asam sitrat dan maleik) pada pelarutan chitosan menghasilkan group karboksil 0,5 meqs/g pada kain yang dicelup dengan larutan chitosan asam karboksilat. Kemudian kain kapas yang tel

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Obushak, Mykola D., Fedor I. Zubkov, Maryana A. Nadirova та ін. "Application of the Intramolecular Diels–Alder Vinylarenе (IMDAV) Approach for the Synthesis of Thieno[2,3-f]isoindoles". Synthesis 52, № 15 (2020): 2196–223. http://dx.doi.org/10.1055/s-0039-1690833.

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3-(Thien-2-yl)- and 3-(thien-3-yl)allylamines, readily accessible from the corresponding thienyl aldehydes, can interact with a broad range of anhydrides and α,β-unsaturated acids chlorides (maleic, сitraconic, and phenyl maleic anhydrides, сrotonyl and сinnamyl chlorides, etc.) leading to the formation of a thieno[2,3-f]isoindole core. Usually, the reaction sequence involves three successive steps: acylation of the nitrogen atom of the initial allylamine, the intramolecular Diels–Alder vinylarenе (IMDAV) reaction, and the final aromatization of the dihydrothiophene ring in the Diels–Alder ad

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27

Varga, Z., G. Kiss, and H. C. Hansson. "Modelling the cloud condensation nucleus activity of organic acids on the basis of surface tension and osmolality measurements." Atmospheric Chemistry and Physics 7, no. 17 (2007): 4601–11. http://dx.doi.org/10.5194/acp-7-4601-2007.

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Abstract. In this study vapour pressure osmometry was used to determine water activity in the solutions of organic acids. The surface tension of the solutions was also monitored in parallel and then Köhler curves were calculated for nine organic acids (oxalic, malonic, succinic, glutaric, adipic, maleic, malic, citric and cis-pinonic). Surface tension depression is negligible for most of the organic acids in dilute (≤1 w/w%) solutions. Therefore, these compounds affect equilibrium vapour pressure only in the beginning phase of droplet formation when the droplet solution is more concentrated bu

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Khabadze, Z. S., Ya A. Negorelova, A. A. Gevorkyan, et al. "Comparative analysis of smear layer removal techniques in the treatment of dental caries." NEW ARMENIAN MEDICAL JOURNAL, no. 1 (2022): 49–57. http://dx.doi.org/10.56936/18290825-2022.16.1-49.

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The purpose of this systematic literature analysis is to review the application features of various types of acids and to determine the most effective etching technique to achieve maximum elimination of the smear layer. Materials and methods: the analysis of up-to-date Russian and English literature was carried out in Google Scholar and PubMed electronic databases. The analysis identified the features of various etching techniques using phosphoric, maleic and polyacrylic acids to achieve maximum elimination of the smear layer. Results: during the analysis, 67 articles were examined. After anal

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Rodenas, Y., R. Mariscal, J. L. G. Fierro, D. Martín Alonso, J. A. Dumesic та M. López Granados. "Improving the production of maleic acid from biomass: TS-1 catalysed aqueous phase oxidation of furfural in the presence of γ-valerolactone". Green Chemistry 20, № 12 (2018): 2845–56. http://dx.doi.org/10.1039/c8gc00857d.

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V., BALASUBRAMANIYAN, V. PATEL M., and ARGADE N.P. "Reactions of o-Aminothiophenol with Maleic Anhydride. A Correction in Structural Assignment of the Product." Journal of Indian Chemical Society Vol. 65, Jun 1988 (1988): 455. https://doi.org/10.5281/zenodo.6303574.

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Science Research Centre, HPT Arts & RYK Science College, Nashik-422 005 <em>Manuscript received 9 November 1987, accepted 11 March 1988</em> Reactions of <em>o</em>-Aminothiophenol with Maleic Anhydride. A Correction in Structural Assignment of the Product.

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(Mrs.), V. S. KATKAR, and N. MUNSHI K. "Physicochemical Investigation on some Ternary Complexes of Dioxouranium(VI)." Journal of Indian Chemical Society Vol. 62, Oct 1985 (1985): 736–39. https://doi.org/10.5281/zenodo.6322748.

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Department of Chemistry, Nagpur University, Nagpur-440 010 <em>Manuscript received 5 September 1984, revised 19 June 1985, accepted 29 October 1985</em> This paper reports potentiometric studies on some mixed ligand complexes of U<em><sup>VI</sup></em>O<sub>2</sub> using nitrilotriacetic acid as primary ligand, and succinic, malic, maleic, fumaric, malonic, adipic, itaconic phthalic and mandelic acids as secondary ligands. The thermodynamic parameters, <em>\(viz\)</em> .∆G, ∆H and ∆S have been evaluated. The ∆G and ∆H values have been further separated into their electrostatic compon

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Ribeiro, Rui S., Adrián M. T. Silva, Helder T. Gomes, and Joaquim L. Faria. "High-performance liquid chromatography as a tool to evaluate the performance of the catalytic wet peroxide oxidation of 4-nitrophenol: pre-validation of analytical methods." U.Porto Journal of Engineering 1, no. 1 (2017): 50–66. http://dx.doi.org/10.24840/2183-6493_001.001_0006.

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A high-performance liquid chromatography (HPLC) method capable to detect 4-nitrophenol (4-NP) in aqueous solutions with concentration in the range 0.0495-118.8 mg L-1 was developed and validated under the typical criteria for in -house pre-validations. Accordingly, linearity was demonstrated through the Fisher’s exact probability test. Accuracy and precision were then assessed in three concentrationlevels over the linear range. The reproducibility of the catalytic wet peroxide oxidation (CWPO) of 4-NP was evaluated together with the analytical error of 4-NP determination in independent experim

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Levdansky, Vladimir Aleksandrovich, Natal'ya Viktorovna Garyntseva, and Aleksandr Vladimirovich Levdanskiy. "ESTERIFICATION OF BETULIN 3-ACETATE IN MELTS OF THE MALEIC AND LEVULINIC ACIDS." chemistry of plant raw material, no. 4 (December 15, 2023): 361–65. http://dx.doi.org/10.14258/jcprm.20230412656.

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Esters of betulin containing residues of bioactive aromatic and aliphatic acids are of interest to the chemical and pharmaceutical industry as hepatoprotectors, anti-inflammatory, antiulcer and immunomodulatory substances. The development of new efficient, ecological and economical methods for the synthesis of betulin esters is an actual task. A new "green" method for the production of betulin 3-acetate-28-maleate and betulin 3-acetate-28-levulinate has been developed. For the first time, esterification of betulin 3-acetate with melts of maleic acid and levulinic acids was carried out at a tem

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Dashkevich, Svetlana, Svetlana Gordeiko, and Natalia German. "THE PRODUCTION OF NEW MODIFIED ROSIN PRODUCTS AND THEIR APPLICATION FOR THE HYDROPHOBIZATION OF PAPER AND CARDBOARD ON RESOURCE-SAVING TECHNOLOGIES." Transaction Kola Science Centre 15, no. 1 (2024): 130–36. https://doi.org/10.37614/2949-1215.2024.15.1.020.

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The developed modified rosin products (MCP), unlike analogues of TM and LM, contain a new modifying substance in the structure of resin acids (monoesters of maleic anhydride and higher fatty alcohols) instead of monoethylcellose maleinate and maleic anhydride and have improved (by 1.7–2.1 times) hydrophobic properties. The technology of using new MCPs ensures a reduction in their costs from 4 to 2% and electrolyte by 2.5–3.5 times due to the shift of the sizing process from the traditional homocoagulation mode to a more efficient heteroadagulation mode.

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Camarasa, Carole, Frédérique Bidard, Muriel Bony, Pierre Barre, and Sylvie Dequin. "Characterization of Schizosaccharomyces pombe Malate Permease by Expression in Saccharomyces cerevisiae." Applied and Environmental Microbiology 67, no. 9 (2001): 4144–51. http://dx.doi.org/10.1128/aem.67.9.4144-4151.2001.

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ABSTRACT In Saccharomyces cerevisiae, l-malic acid transport is not carrier mediated and is limited to slow, simple diffusion of the undissociated acid. Expression in S. cerevisiae of the MAE1 gene, encodingSchizosaccharomyces pombe malate permease, markedly increased l-malic acid uptake in this yeast. In this strain, at pH 3.5 (encountered in industrial processes),l-malic acid uptake involves Mae1p-mediated transport of the monoanionic form of the acid (apparent kinetic parameters:V max = 8.7 nmol/mg/min;Km = 1.6 mM) and some simple diffusion of the undissociated l-malic acid (Kd = 0.057 min−

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Tudorascu, Marius, Spiridon Oprea, Afrodita Doina Marculescu, and Stefania Tudorascu. "Enzymatic Iodination of Maleic and Fumaric Acids Diethyl Esters." Revista de Chimie 59, no. 12 (2009): 1400–1404. http://dx.doi.org/10.37358/rc.08.12.2071.

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The mechanism of the enzymatic iodination process of diethylmaleate and diethylfumarate (which present no miscibility with water) in the presence of lactoperoxidase, both in diluted hydrogen peroxide solution and in a generating system of hydrogen peroxide using ammonium and calcium iodides as halide sources in disperse system (after an ultrasonic pretreatment) was studied. The obtained sole product (diethyl-2, 3-diiodosuccinate) after the enzymatic iodination process was directly hydrolyzed to a tartaric acid present in an optically inactive form. The mechanism of obtaining the intermediate a

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37

Leban, Ivan, Nina Lah, Žiga Hodnik, Danijel Kikelj, and Jože Kastelic. "Fluconazole and its cocrystals with maleic and glutaric acids." Acta Crystallographica Section A Foundations of Crystallography 66, a1 (2010): s227. http://dx.doi.org/10.1107/s0108767310094845.

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Gabriele, Bartolo, Lucia Veltri, Giuseppe Salerno, Mirco Costa, and Gian Paolo Chiusoli. "Synthesis of Maleic Anhydrides and Maleic Acids by Pd-Catalyzed Oxidative Dicarbonylation of Alk-1-ynes." European Journal of Organic Chemistry 2003, no. 9 (2003): 1722–28. http://dx.doi.org/10.1002/ejoc.200210706.

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39

Sivamani, S. "Production of Total Reducing Sugars from Bambusa balcooa through Oxalic Acid Pretreatment." Bioscience Biotechnology Research Communications 15, no. 1 (2022): 236–42. http://dx.doi.org/10.21786/bbrc/15.1.36.

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This study aims to assess the applicability of organic acid pretreatment on culm of Bambusa balcooa for the production of maximum total reducing sugars. The experiments were performed by varying organic acids (Formic, acetic, pyruvic, maleic, malic, tartaric, adipic, citric and oxalic acids), concentration of oxalic acid (1-4% (w/v)), solvent to solid ratio (5-40 mL/g), pretreatment time (0-60 min) and temperature (75-135 0C) to maximize total reducing sugars (TRS) concentration using fractional factorial design based one-factor-at-a-time (OFAT) approach. Total reducing sugars concentration wa

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40

Gueche, Yanis Abdelhamid, Noelia M. Sanchez-Ballester, Bernard Bataille, Adrien Aubert, Jean-Christophe Rossi, and Ian Soulairol. "Investigating the Potential Plasticizing Effect of Di-Carboxylic Acids for the Manufacturing of Solid Oral Forms with Copovidone and Ibuprofen by Selective Laser Sintering." Polymers 13, no. 19 (2021): 3282. http://dx.doi.org/10.3390/polym13193282.

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In selective laser sintering (SLS), the heating temperature is a critical parameter for printability but can also be deleterious for the stability of active ingredients. This work aims to explore the plasticizing effect of di-carboxylic acids on reducing the optimal heating temperature (OHT) of polymer powder during SLS. First, mixtures of copovidone and di-carboxylic acids (succinic, fumaric, maleic, malic and tartaric acids) as well as formulations with two forms of ibuprofen (acid and sodium salt) were prepared to sinter solid oral forms (SOFs), and their respective OHT was determined. Plas

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Borkina, Ya V., V. L. Fleisher, and Zh S. Shashok. "Features of modification of polyaminoamides with rosin-maleic adducts." Proceedings of the National Academy of Sciences of Belarus, Chemical Series 58, no. 3 (2022): 294–301. http://dx.doi.org/10.29235/1561-8331-2022-58-3-294-301.

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The features of the process of chemical modification of polyaminoamides based on adipic acid and diethylenetriamine with rosin-maleic adducts differing in the content of maleopimaric acid (8.55; 16.46 and 31.12 % wt.) are considered. Modification of polyaminoamides with rosin-maleic adducts in the amount equal to the number of secondary amino groups in the repeating unit of the polymer was carried out in the melt at temperature 160–180 °C for 3 h under continuous stirring. The process was controlled by monitoring the change in the acid and amine numbers of the reaction mass. The most intensive

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Mitrasov, Yury N., Natalia A. Chigarova, Anzhelika A. Avruyskaya, Oleg A. Kolyamshin, Larisa M. Trofimova, and Oksana V. Kondratieva. "Synthesis and growth-regulating activity of ammonium salts maleamic acids." Butlerov Communications 59, no. 9 (2019): 75–81. http://dx.doi.org/10.37952/roi-jbc-01/19-59-9-75.

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The article describes the synthesis of ammonium salts of maleamic acids containing amino acid fragments. At the first stage, the interaction of maleic anhydride with aliphatic and aromatic amino acids yielded the corresponding maleamic acids. Glycine, α-alanine, ε-aminocaproic, para-aminosalicylic, ortho-, meta- and para-aminobenzoic acids were used as amino acids. In the case of aliphatic amino acids, the process was carried out in an aqueous or aqueous-acetone (2: 1) medium. For aromatic amino acids, acetone was used as a solvent. As weakly exothermic reactions progressed, colorless finely c

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T., SAROJINI, C. SOMASEKHARA REDDY M., and RAMACHANDRAIAH A. "Electrochemical Characteristics of N-Phenylmonoamide Derivatives of some 1,2-Dicarboxylic Acids." Journal of Indian Chemical Society Vol. 72, Jan 1995 (1995): 33–36. https://doi.org/10.5281/zenodo.5900449.

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Department of Chemistry, Regional Engineering College, Warangal-506 004 Department of Chemistry, G. Pulla Reddy Engineering College, Pulla Reddy Nagar, Kurnool-518 002 <em>Manuscript received 16 December 1992, revised 9 June 1993, accepted 12 October 1993</em> Electrochemical investigations have been carried out on a few NaL systems by cyclic voltammetric and coulometric techniques, where HL' s are N-phenylmonoamide derivatives of 1,2-dicarboxylic acids (1), on mercury electrode in a buffered aqueous media (pH range 6-12) at room temperature (25°). Only the maleic acid derivatives resp

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44

Bogdanowicz-Szwed, Krystyna, and Artur Budzowski. "Hetero-Diels-Alder Reactions of Enaminothione with Electrophilic Olefins. Synthesis of 2-Furyl Substituted 2H-Thiopyrans." Zeitschrift für Naturforschung B 57, no. 6 (2002): 637–44. http://dx.doi.org/10.1515/znb-2002-0608.

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AbstractThe hetero-Diels-Alder reaction of 1-(2-furyl)-3-(dimethylamino)-2-propene-1-thione (diene) with maleic and fumaric acids, and β-nitrostyrenes yielded 3,4-dihydro-2H-thiopyran derivatives. Treatment of some of those cycloadducts with acetic acid caused elimination of dimethylamine yielding stable 2H-thiopyrans. Reaction of the diene with maleic anhydride furnished a cycloadduct which underwent spontaneous rearrangement to form an N,N-dimethylamide derivative. Cycloadditions of the diene to maleimide, N-phenylmaleimide, diethyl maleate, fumarate and butenolide, carried out in the presen

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45

Leitzke, Achim, and Clemens von Sonntag. "Ozonolysis of Unsaturated Acids in Aqueous Solution: Acrylic, Methacrylic, Maleic, Fumaric and Muconic Acids." Ozone: Science & Engineering 31, no. 4 (2009): 301–8. http://dx.doi.org/10.1080/01919510903041354.

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46

Nisar, Madiha, Lawrence W. Y. Wong, Herman H. Y. Sung, Richard K. Haynes, and Ian D. Williams. "Cocrystals of the antimalarial drug 11-azaartemisinin with three alkenoic acids of 1:1 or 2:1 stoichiometry." Acta Crystallographica Section C Structural Chemistry 74, no. 6 (2018): 742–51. http://dx.doi.org/10.1107/s2053229618006320.

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The stoichiometry, X-ray structures and stability of four pharmaceutical cocrystals previously identified from liquid-assisted grinding (LAG) of 11-azaartemisinin (11-Aza; systematic name: 1,5,9-trimethyl-14,15,16-trioxa-11-azatetracyclo[10.3.1.04,13.08,13]hexadecan-10-one) with trans-cinnamic (Cin), maleic (Mal) and fumaric (Fum) acids are herein reported. trans-Cinnamic acid, a mono acid, forms 1:1 cocrystal 11-Aza:Cin (1, C15H23NO4·C9H8O2). Maleic acid forms both 1:1 cocrystal 11-Aza:Mal (2, C15H23NO4·C4H4O4), in which one COOH group is involved in self-catenation, and 2:1 cocrystal 11-Aza2

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47

Moldoveanu, Serban C., Thomas Poole, and Wayne A. Scott. "An LC-MS Method for the Analysis of Some Organic Acids in Tobacco Leaf, Snus, and Wet Snuff." Beiträge zur Tabakforschung International/Contributions to Tobacco Research 28, no. 1 (2018): 30–41. http://dx.doi.org/10.2478/cttr-2018-0004.

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SummaryThe present study describes the analysis of several organic acids in tobacco and smokeless tobacco products using a liquid chromatography (LC) method with mass spectrometric (MS) detection (LC-MS). Prior to the application of the LC-MS method, a qualitative analysis for the identification of the organic acids in tobacco and oral tobacco products was performed. The qualitative method used direct silylation of the plant material followed by GC-MS separation and detection. For the acids’ quantitation, a novel LC-MS method has been developed and validated. The acids of interest for quantita

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Nakamura, Y., T. Sawada, F. Kobayashi, and M. Godliving. "Microbial treatment of kraft pulp wastewater pretreated with ozone." Water Science and Technology 35, no. 2-3 (1997): 277–82. http://dx.doi.org/10.2166/wst.1997.0537.

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Kraft pulp wastewater was treated with a combination of ozone and activated sludge. The effects of pH on the degradation of lignin and the production of organic acids were examined experimentally in the ozonolysis of wastewater. The strong alkaline condition enhanced not only the degradation of lignin but also the production of organic acids. The dynamic behaviours of microbial growth and substrate consumption were investigated in the biodegradation of organic acids using activated sludge. Maleic acid and oxalic acid in the ozonized wastewater were degraded completely by the activated sludge.

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Yu, Changxia, Yan Wang, Hui Cao, et al. "Simultaneous Determination of 13 Organic Acids in Liquid Culture Media of Edible Fungi Using High-Performance Liquid Chromatography." BioMed Research International 2020 (July 31, 2020): 1–7. http://dx.doi.org/10.1155/2020/2817979.

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The study aimed at detecting 13 organic acids (oxalic acid, maleic acid, citric acid, tartaric acid, malic acid, quinic acid, succinic acid, fumaric acid, formic acid, acetic acid, propionic acid, isobutyric acid, and butyric acid) by establishing a high-performance liquid chromatography (HPLC). The analysis was performed using two sugar columns, i.e., SH1011 column and KC-811 column. The optimal conditions were as follows: 4 mmol/L HClO4 solution as the eluent with UV-visible detector (210 nm), a flow rate of 1 mL/min at the temperature of 60°C, and the injection volume at 10 μL. The results

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Herrington, Philip R., Yinqui Wu, and Murray C. Forbes. "Rheological modification of bitumen with maleic anhydride and dicarboxylic acids." Fuel 78, no. 1 (1999): 101–10. http://dx.doi.org/10.1016/s0016-2361(98)00120-3.

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