The suitability of micellar electrokinetic chromatography for the simultaneous trace determination of several compounds (sulfamethoxazole, trimethoprim, sulfanilic acid, sulfanilamide, 3,4,5-trimethoxybenzoic acid and nonoxynol-9) was assessed. The mixture was separated within 14min at an applied voltage of 22kV by using 30mM phosphate electrolyte, containing 10mM SDS, adjusted to pH 7.8. Under...

This communication describes the utility of a conformationally restricted aromatic β-amino acid (2-aminobenzenesulfonic acid, (S)Ant) inducing various folding interactions in short peptides. Sandwiching (S)Ant between diverse amino acid residues was shown to form robust folded architectures featuring a variety of H-bonded networks, suggesting its utility in inducing peptide folding.

In 1925, I published a method for the quantitative calorimetric determination of tyr0sine.l Up to that time tyrosine had been determined either by actual isolation or by calorimetric procedures that were applied to the crude hydrolysates. The calorimetric procedures employed were not certainly characteristic for tyrosine and reactions that are allowed to proceed in the presence of 95 or more pe...

Two upflow anaerobic sludge blanket (UASB) reactors were operated to investigate the fate of aromatic amines under denitrifying conditions. The feed consisted of synthetic wastewater containing aniline and/or sulfanilic acid and a mixture of volatile fatty acids (VFA) as the primary electron donors. Reactor 1 (R1) contained a stoichiometric concentration of nitrate and Reactor 2 (R2) a stoichio...

A procedure has been developed for the automated measurement of conjugated bilirubin in serum with a centrifugal analyzer. The conjugated bilirubin is measured by a fixed time kinetic method which monitors the reaction between conjugated bilirubin and diazotized sulfanilic acid at 550 nm. Results are calculated based on a comparison of the reagent blank-corrected absorbance changes between 15 s...

The determination of triflouperazine hydrochloride in pure and dose forms has been developed using a simple spectrophotometric approach. method employs an oxidative coupling reaction with sulfanilic acid the presence N-bromosuccinimide to produce red-violet colored product maximum absorbance 537nm. For 12 hours remains stable. molar absorptivity 0.55x104 L.mole −1.cm-1, Beer's law is followed o...