Bonding of monocarboxylic acids, monophenols and nonpolar compounds onto goethite

Chemosphere ◽  
2019 ◽  
Vol 214 ◽  
pp. 158-167 ◽  
Author(s):  
Chenglong Yu ◽  
J.F. Devlin ◽  
Erping Bi
Keyword(s):  
Monocarboxylic Acids ◽  
Nonpolar Compounds

Extraction of monocarboxylic acids from diluted solutions by polyethylene glycol

2018 ◽  
pp. 303-307
Author(s):  
I. V. Zinovyeva ◽  
◽  
Yu. A. Zakhodyayeva ◽  
A. A. Voshkin ◽  
◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Monocarboxylic Acids

Development of Pseudo-C2-symmetric Chiral Binaphthyl Monocarboxylic Acids for Enantioselective C(sp3)–H Functionalization Reactions under Rh(III) Catalysis

ACS Catalysis ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 4271-4277
Author(s):  
Yoshimi Kato ◽  
Luqing Lin ◽  
Masahiro Kojima ◽  
Tatsuhiko Yoshino ◽  
Shigeki Matsunaga
Keyword(s):  
Monocarboxylic Acids

scholarly journals Chiroptical activity of hydroxycarboxylic acids with implications for the origin of biological homochirality

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Jana Bocková ◽  
Nykola C. Jones ◽  
Uwe J. Meierhenrich ◽  
Søren V. Hoffmann ◽  
Cornelia Meinert
Keyword(s):  
Amino Acids ◽  
Lactic Acid ◽  
Organic Molecules ◽  
Building Blocks ◽  
Aliphatic Chain ◽  
Monocarboxylic Acids ◽  
Hydroxycarboxylic Acids ◽  
Polarised Light ◽  
Suitable Target ◽  
Anisotropy Spectra

AbstractCircularly polarised light (CPL) interacting with interstellar organic molecules might have imparted chiral bias and hence preluded prebiotic evolution of biomolecular homochirality. The l-enrichment of extra-terrestrial amino acids in meteorites, as opposed to no detectable excess in monocarboxylic acids and amines, has previously been attributed to their intrinsic interaction with stellar CPL revealed by substantial differences in their chiroptical signals. Recent analyses of meteoritic hydroxycarboxylic acids (HCAs) – potential co-building blocks of ancestral proto-peptides – indicated a chiral bias toward the l-enantiomer of lactic acid. Here we report on novel anisotropy spectra of several HCAs using a synchrotron radiation electronic circular dichroism spectrophotometer to support the re-evaluation of chiral biomarkers of extra-terrestrial origin in the context of absolute photochirogenesis. We found that irradiation by CPL which would yield l-excess in amino acids would also yield l-excess in aliphatic chain HCAs, including lactic acid and mandelic acid, in the examined conditions. Only tartaric acid would show “unnatural” d-enrichment, which makes it a suitable target compound for further assessing the relevance of the CPL scenario.

scholarly journals Concurrent chromatographic determination of pseudoephedrine and loratadine from combination syrups and tablets

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Imad Osman Abu Reid
Keyword(s):  
Ammonium Acetate ◽  
Chemical Properties ◽  
Chromatographic Determination ◽  
Analytical Challenge ◽  
Intermediate Precision ◽  
Box Behnken Design ◽  
Complex Samples ◽  
System Suitability ◽  
Nonpolar Compounds

Abstract Background Chromatographic separation of polar and nonpolar compounds when presented in combined dosage forms has always been considered as great analytical challenge. Separation and retention of both polar and nonpolar compounds by the same stationary phase can be a useful approach for analyses of complex samples with such a difference in chemical properties. Loratadine (nonpolar) and pseudoephedrine (polar) are typical examples of this situation. Results The Box–Behnken design was used to optimize the separation process, an efficient separation of loratadine and pseudoephedrine was achieved within 6 min; employing a mixture of 16.0 mM ammonium acetate buffer (pH 4.5) and acetonitrile (23:77, v/v) as isocratic mobile phase, pumped at 1.0 mL/min through a Zorbax cyanopropyl column (250 mm × 4.6 mm, 5 μm), the analytes were detected at 250 nm. Under the same conditions, separation of sodium benzoate preservative co-formulated with the two analytes in syrup formulation was also achieved. The calibration curve demonstrated excellent linearity in the range of 24.6–123.2 μg/mL and 594.8–2974.0 μg/mL for loratadine and pseudoephedrine, respectively with determination coefficient (r2) > 0.999. Conclusion The method’s accuracy bias < 2.0%, repeatability and intermediate precision (%RSD < 2.0%) were verified. In addition, system suitability parameters were found within the acceptable limits. Satisfactory results were obtained upon the application of the validated method to the analysis of commercial tablet and syrup formulations.

The infrared spectra of some aliphatic monocarboxylic acids in the 700-350 cm−1 region

1964 ◽  
Vol 20 (4) ◽  
pp. 685-693 ◽  
Author(s):  
F.F. Bentley ◽  
M.T. Ryan ◽  
J.E. Katon
Keyword(s):  
Infrared Spectra ◽  
Monocarboxylic Acids

scholarly journals The Uptake of Monocarboxylic Acids by Rat Diaphragm

1961 ◽  
Vol 236 (4) ◽  
pp. 1019-1022
Author(s):  
Ernest C. Foulkes ◽  
C.M. Paine
Keyword(s):  
Rat Diaphragm ◽  
Monocarboxylic Acids

Gold-catalyzed synthesis of dicarboxylic and monocarboxylic acids

2012 ◽  
Vol 114 (11) ◽  
pp. 1327-1332 ◽  
Author(s):  
Anna Kulik ◽  
Alexander Janz ◽  
Marga-Martina Pohl ◽  
Andreas Martin ◽  
Angela Köckritz
Keyword(s):  
Monocarboxylic Acids
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