Three types of ligands have been developed for copper-catalyzed Ullmann cross coupling reaction of bromaminic acid with amines in aqueous solution. Ligands with large steric hindrance and strong electron-donating capacity were beneficial to the reaction. UV–Vis and CV analyses demonstrated that...

To examine the consequences of nature and number of nitrogen atoms on metal ion sensing properties, four new molecular receptors based on 1-aminoanthracene-9,10-dione as chromogenic moiety and different types of nitrogen atoms viz. arylamine, alkylamine, and pyridyl nitrogen as appendages have b...

Few decades ago, the expertise gained from well-established extraction, processing and degradation techniques, paved the way for the use of ultrasounds as an alternative energy source in chemistry. Among other peculiar features, the locally extreme temperatures and pressures resulting from cavit...

The growing desire to produce organic acids through fermentative routes, as a starting point for bio-based plastics, has revived the scientific attention on carboxylic acid removal from aqueous streams. One of the main technologies to recover carboxylic acids from diluted aqueous streams is liqu...

Natural deep eutectic solvents (NADESs) are defined as mixtures of certain molar ratios of natural compounds such as sugars, organic acids, amino acids, and organic bases that are abundant in organisms. The melting points of these mixtures are considerably lower than those of their individual in...

Biomass is renewable, abundant, cheap, biocompatible, and biodegradable materials and has been used to produce chemicals, materials, energy, and fuels. However, most of the biomass, especially most of the biomass polymers are not soluble in common solvents, which hinders their pretreatment and c...

The catalytic oxidation of 1-amino-2-naphthol-4-sulfonic, acid proceeds quickly with microgram amounts of iodide in the presence of sodium chlorate at pH between 1.3 and 2.0. The oxidation product shows a sensitive tensammetric wave at potentials of about +0.03 V vs. SCE (pH 1.75), so that the c...

A quantitative method using liquid chromatography–tandem mass spectrometry (LC–MS–MS) was developed for the simultaneous determination of 23 endogenous steroids in primate urine. The introduced method includes estrone, pregnandiol, cortisol, testosterone and several human urinary glucocortico...

A series of poly(ester amide)s with ester/amide group ratios ranging from 199 to 14 were obtained using 1,6-hexanediamine, 1,6-hexanediol and 2,3-di-O-methoxy-l-tartaric and succinic acids as building blocks. The ester linkages were introduced in pairs using as comonomer the diacid resulting fro...

Dichloroacetic acid (DCA) is a complete hepatocarcinogen and tumor promoter in the male B6C3F1 mouse. Published reports indicate that the compound is non-genotoxic. This study examines possible non-genotoxic (epigenetic) mechanisms by which DCA elicits its carcinogenic response. Correlative bioc...

Poly(ester amide)s have emerged in the last years as an important family of biodegradable synthetic polymers. These polymers present both ester and amide linkages in their structure and they gather in the same entity the good degradability of polyesters with the good thermo-mechanical properties...

A gas chromatographic procedure is described which permits quantification of dichloroacetic acid in urine or plasma to a lower limit of about 0.04 μg/ml. Preliminary data are given to suggest that the method should be equally applicable to the determination of trichloroacetic acid. The procedur...

Quantitative analysis has been performed on the products of direct as well as benzene- and acetone-sensitized photolysis of ethyl and methyl dichloroacetates in cyclohexane. Their quantum yields have been determined. It has been found that the primary mechanism is similar to that for correspondi...

An analytical liquid-liquid extraction-gas chromatography–mass spectrometry (LLE-GC-MS) method was developed for the determination of nine haloacetic acids (HAAs) in water. Under the optimized conditions, the matrix-matched calibration curves of all analytes presented correlation coefficients h...

A simple and rapid headspace method for gas chromatographic determination of dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA) in drinking water was developed. Acidic methanol esterification followed by a headspace technique using a capillary column gas chromatograph (GC) equipped with ...

Halogenated acetic acids (HAAs) produced by chlorine disinfection of municipal drinking water represent a potentially important class of environmental contaminants. Little is known, however, about their potential to adversely impact fish and other aquatic life. In this study we examined the kine...

Monochloroacetic acid (MCA) is produced via the chlorination of acetic acid, in which a part is overchlorinated to the undesired dichloroacetic acid (DCA). The separation of DCA from MCA by distillation is highly energy intensive, because of the rather low relative volatility of ∼1.05–1.3, dep...

•Clostridium tyrobutyricum is an excellent microorganism for bio-based butyric acid production. However, the main obstacles for its industrialization are low butyric acid concentration and productivity. This study indicated that overexpression of rate-limiting enzymes in the Embden-Meyerhof-Parn...

A series of cocrystals and a salt of the indole-3-acetic acid (IAA) and indole-3-butyric acid (IBA) (plant hormone) with 2-aminopyrimidine (2AP), 2-amino-4,6-dimethylpyrimidine (2A-4,6-DMP) and 2,4,6-triaminopyrimidine (2,4,6-TAP) were successfully prepared, with an aim to explore the robustness...

A kinetic study of 2-methyl butyric acid esterification reaction catalyzed by immobilized lipase (from Candida antarctica) has been made in a range of 62 – 78°C temperature. The kinetic characteristics observed in the chiral resolution of (±) 2-methyl butyric acid by esterification reaction w...