Carboxylic Acids
Mostrando 1-12 de 268 artigos, teses e dissertações.
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1. Diesel-Like Biofuels Production Using Fatty Waste
According to the waste-to-energy (WTE) valorization and circular economy principles, the use of waste oil and grease (WOG) for obtaining biofuels shows the tendency towards sustainability, makes the interest in green chemistry, and the development of environmentally friendly processes grow. Three different fatty wastes (from the fat trap of a sewage station,
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Structure-Physical Properties Relationship of Eutectic Solvents Prepared from Benzyltriethylammonium Chloride and Carboxylic Acids
Deep eutectic solvents (DESs) have attracted the attention of the researchers as alternative solvents due to desirable properties such as easy preparation and high thermal stability. In this work, it was reported the preparation of five DESs from benzyltriethylammonium chloride (BTEAC) as quaternary ammonium salt (QAS) and carboxylic acids (oxalic, malonic o
J. Braz. Chem. Soc.. Publicado em: 2021-03
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3. Inhibition of Acetylcholinesterase by Coumarin-Linked Amino Acids Synthetized via Triazole Associated with Molecule Partition Coefficient
A previous study for the identification of acetylcholinesterase (AChE) inhibitors demonstrated that the hybrid between tyrosol, the 1,2,3-triazole nucleus, and the coumarin group, namely 7-({1-[2-(4-hydroxyphenyl)ethyl]-1H-1,2,3-triazol-4-yl}methoxy)-4-methyl-2H-chromen-2-one (10), has a high enzyme inhibitory activity. Here, we synthesized analogues of 10 v
J. Braz. Chem. Soc.. Publicado em: 2021-03
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4. Metabolization of Insecticidal Amides from Leaves of Piper tuberculatum by Heraclydes hectorides and Naupactus bipes
Amides have been recognized as potent insecticidal natural products but, despite their variety of targets and mechanisms of action, their metabolic fate in insects is virtually unknown. The currently accepted hypothesis is that specialist herbivores are capable of biotransforming xenobiotics rendering them more polar and excretable while generalist insects d
J. Braz. Chem. Soc.. Publicado em: 2020-04
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5. ELECTROCHEMICAL INCINERATION OF SHORT-CHAIN CARBOXYLIC ACIDS WITH NB‑SUPPORTED BORON DOPED DIAMOND ANODE: SUPPORTING ELECTROLYTE EFFECT INTO THE ELECTROGENERATED OXIDANT SPECIES (HYDROXYL RADICALS, HYDROGEN PEROXIDE AND PERSULFATE)
This work describes the electrochemical oxidation study of three short chain carboxylic acids (acetic, oxalic and formic 0.18 mol L-1) using different electrolysis conditions (electrolyte composition and current density) in an electrochemical reactor fitted with niobiumsupported/BDD electrode (Nb/BBD) as anode and titanium plate as cathode. The experiments w
Quím. Nova. Publicado em: 2020-03
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6. PERFIL METABÓLICO DOS EXTRATOS POLARES DAS FOLHAS, GALHOS E CASCAS DE Copaifera multijuga HAYNE (COPAÍBA MARI-MARI DA AMAZÔNIA) POR ESI-EM
Copaifera multijuga Hayne is the main species of the genus in the Amazon region, being exploited for copaiba oil production mainly because of its therapeutic properties. The plant parts (leaves, branches, and barks) are widely used in folk medicine. However, they are little explored in terms of chemical composition. In this study, the polar extracts of leave
Quím. Nova. Publicado em: 2020-01
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7. Efeito dos ácidos itacônico e fumárico na copolimerização em emulsão do estireno com acrilato de n-butila para produção de argamassa cimentícia
RESUMO Monômeros carboxílicos são frequentemente empregados em formulações de polímeros obtidos via polimerização em emulsão e miniemulsão visando melhorar ás propriedades de aplicação dos látexes. O objetivo deste trabalho foi avaliar o efeito dos ácidos itacônico IAI), fumárico (AF) e metacrílico (AMA) na copolimerização em emulsão do
Matéria (Rio J.). Publicado em: 16/09/2019
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8. Value of Functionalized Charcoal for Increasing the Efficiency of Urea N Uptake: Insights into the Functionalization Process and the Physicochemical Characteristics of Charcoal
ABSTRACT Functionalized charcoal (CHox) incorporated into urea is known for its ability to reduce NH3 volatilization and increase agronomic efficiency. However, it is important to optimize the functionalization process and to elucidate its relationship with the physicochemical properties of CHox for N supply. Thus, charcoal obtained from eucalyptus wood was
Rev. Bras. Ciênc. Solo. Publicado em: 15/08/2019
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9. Design, synthesis, biological evaluation, and nitric-oxide release studies of a novel series of celecoxib prodrugs possessing a nitric-oxide donor moiety
A new group of hybrid nitric oxide-releasing anti-inflammatory drugs (NONO-coxibs), in which an O 2-acetoxymethyl-1-(N-ethyl-N-methylamino)diazen-1-ium-1,2-diolate NO-donor moiety is attached directly to the carboxylic acid group of 1-(4-aminosulfonylphenyl)-5-aryl-1H-pyrazol-3-carboxylic acids (6a-c), were synthesized. A low amount of NO was released from t
Braz. J. Pharm. Sci.. Publicado em: 08/04/2019
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10. SPME Fiber Evaluation for Volatile Organic Compounds Extraction from Acerola
Volatile organic compounds (VOCs) were isolated from acerola fruits (Malpighia emarginata D.C.), by means of different solid phase microextraction (SPME) fibers. For the extraction, the headspace SPME method was used, identifying the VOCs by gas chromatography (GC) with mass spectrometry (MS). The objective of this work was to evaluate the efficiency of SPME
J. Braz. Chem. Soc.. Publicado em: 2019-02
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11. (+)-BINOL and Pure Shift Experiment: A Bidirectional Approach for NMR Chiral Discrimination of Overcrowded Spectra of Primary Amines
In this work, enantiopure 1,1’-bi-2-naphthol (BINOL) derivatives and carboxylic acids were evaluated as chiral solvating agents (CSAs) in the nuclear magnetic resonance (NMR) chiral discrimination of primary amines. Among the CSAs screened, the readily available (+)-BINOL revealed a simple and rapid chiral auxiliary for 1H NMR chiral discrimination. The pr
J. Braz. Chem. Soc.. Publicado em: 2018-08
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12. Lupeol and its esters: NMR, powder XRD data and in vitro evaluation of cancer cell growth
ABSTRACT The triterpene lupeol (1) and some of its esters are secondary metabolites produced by species of Celastraceae family, which have being associated with cytotoxic activity. We report herein the isolation of 1, the semi-synthesis of eight lupeol esters and the evaluation of their in vitro activity against nine strains of cancer cells. The reaction of
Braz. J. Pharm. Sci.. Publicado em: 01/02/2018