We used a battery of different methods to study the association in aqueous sodium dehydrocholate (NaDHC) solutions. This salt associates by a stepwise mechanism. Below (9.64.2)104 moldm3 there is a molecular solution with some strongly insoluble dehydrocholic acid produced by hydrolysis. Between...
Presuming that the thermodynamic behavior of a system is symmetric, as in the Regular Solution Theory (RST or Rubingh’s method), may mask relevant characteristics and lead to erroneous conclusions derived from inexact computed properties (micelle composition, intramicellar interaction energy, a...
Bile salts are biologically important amphiphiles whose micellar behavior is considerably different from that of ordinary surfactants. In this work pre-micellar sodium dehydrocholate (NaDHC)–sodium deoxycholate (NaDC) mixed aqueous solutions composition is determined and their surface tension b...
The kinetics of the photochemical degradation of the nitromusk compounds musk xylene (MX), musk tibeten (MT), musk ketone (MK), musk ambrette (MA) and musk moscene (MM) in water was evaluated. The kinetics were of pseudo-first order. Different transformation pathways are discussed, nitromusks wi...
The synthetic steroid, pregnenolone-16-α-carbonitrile (PCN), has served for decades as a probe for a postulated series of hepatic defenses activated under situations of environmental ''stress''. PCN, an antiglucocorticoid, and also such glucocorticoids as dexamethasone (Dex) appear to stimulate...
For the first time, [3α‐3H] 17α‐hydroxy pregnenolone (1) was synthesized through a multiple step sequence. The presence of [3β‐3H] isomer in RP‐HPLC purified product was identified by tritium NMR. The [3β‐3H] isomer was then separated from [3α‐3H] 17α‐hydroxy pregnenolone with chira...
Background: Prior neurophysiological studies on patients with premenstrual syndrome (PMS) have revealed sleep electroencephalographic alterations in both cycle phases. We report on a study evaluating saccadic eye movements in PMS patients.Methods: Saccadic eye movements were examined in 21 women...
The analysis of the amino acids present in Murchison meteorite and in other carbonaceous chondrites has revealed the presence of 66 different amino acids. Only eight of these 66 amino acids are proteinaceous amino acids used by the present terrestrial biochemistry in protein synthesis, the other...
The alkylammonium salt of chloramine-T has been used as aminating agent of olefins in the presence of M(TPP)Cl (M = Fe, Mn; TPP = tetraphenylporphyrin) as catalyst. Main products were the corresponding allylamine, the aziridine, the α-chloro-amine derived by attack of chloride ion on the less s...
The kinetics of the oxidation of five catecholamines viz., dopamine (A), L-dopa (B), methyldopa (C), epinephrine (D) and norepinephrine (E) by sodium N-chloro-p-toluenesulfonamide or chloramine-T (CAT) in presence of HClO4 was studied at 30±0.1 °C. The five reactions followed identical kinetic...
The kinetics and mechanism of oxidation of d-glucose, d-mannose, d-fructose, d-arabinose, and d-ribose with chloramine-T in alkaline medium were studied. The rate law, rate=k [Chloramine-T] [Sugar] [HO - ] 2 , was observed. The rate of the reaction was influenced by a change in i...
The widespread occurrence of sulfonamide antibiotics in the environment has raised great concerns about their potential to proliferate antibacterial resistance. Sulfate radical (SO4•-) based advanced oxidation processes (SR-AOPs) are promising in-situ chemical oxidation (ISCO) technologies for r...
The optimized molecular structure, vibrational wavenumbers, atomic charges, molecular electrostatic potential, NBO, electronic properties, NLO, 1 H NMR and 13 C NMR chemical shifts of 4-amino-N-[2-pyridinyl] benzene sulfonamide (APBSA) have been studied in this investigation. The...
The X‐ray crystal structures of solvates of sulfapyridine have been determined to be conformational polymorphs. 4‐Amino‐N‐(1,2‐dihydropyridin‐2‐ylidene)benzenesulfonamide (polymorph III), C11H11N3O2S, (1), 4‐amino‐N‐(1,2‐dihydropyridin‐2‐ylidene)benzenesulfonamide 1,3‐dioxane monos...
The removal of sulfadiazine, sulfamethizole, sulfamethoxazole, and sulfathiazole from aqueous solution by ozonation was studied. The study was conducted experimentally in a semi-batch reactor under different experimental conditions, i.e., varying influent ozone gas concentration, bicarbonate ion...
Mammalian target of rapamycin (mTOR) is a serine/threonine kinase and member of the PI3K-related kinase (PIKK) family. It plays a central role in integrating signals from metabolism, energy homeostasis, cell cycle, and stress response. Aberrant PI3K/mTOR activation is commonly observed in diseas...
The equilibrium solubilities of sulfanilamide, sulfamethizole and sulfapyridine in methanol + water mixtures at 298.15 K were determined and the preferential solvation parameters were derived from their thermodynamic solution properties by means of the inverse Kirkwood–Buff integrals. In all ca...
Nitrogen-doped graphenes (NG) fabricated through thermal annealing of graphene oxide (GO) and urea was applied to activate peroxymonosulfate (PMS) for sulfacetamide (SAM) degradation. The contents of reactive functional groups (graphitic N, pyridinic N, pyrrolic N, nitric oxide and CO) and catal...
Six new N [(4-aminophenyl)sulfonyl]acetamide based hydroxytriazenes have been synthesized and characterized using elemental analysis, IR, 1H NMR, 13C NMR and MASS spectral analysis. Further, their theoretical predictions for probable activities have been taken using PASS (Prediction of Activity ...
Objective: The aim of this study was to explore the possibility of using natural deep eutectic solvents (NADES) as solvation media for enhancement of solubility of sulfonamides, as well as gaining some thermodynamic characteristics of the analyzed systems. Significance: Low solubility of many ac...
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