AIM To study the antioxidant activity, UV absorption, concentration and stability of ascorbic acid (AA) in porcine and bovine aqueous humour (AH). METHODS Porcine and bovine AH was taken within 5 min after death and frozen at -70 degrees C. The characteristic UV absorption band of AA and the concentration of AA in AH was determined by UV spectrophotometry. The antioxidant activity of AA to se...

In this study, zero-, first-, secondand third-order derivative spectrophotometry methods were developed for the determination of metoprolol in pharmaceutical preparations. In zero order spectrophotometry, absorbance values were measured at 276 nm in zero order spectra of solution of metoprolol in methanol in the range of 240-310 nm. In first derivative spectrophotometry, absorbance values were ...

Compounds composed of [Cu(HIm, metIm)2–3L] ∙ nH2O (n = 0, 2) were obtained during the interaction slightly soluble tartrate and copper(II) salicylate CuL 1–2, L2−—Tar2−, Sal2−) with imidazole (HIm) 2-methylimidazole (metIm). Mono- bi-ligand salts analyzed; process their thermal decomposition was studied. The solubility constants KS CuC4H4O6 2H2O CuC7H4O3 H2O at ionic strength 0.3 determined. IR...

In this study, cotton spunlace nonwoven fabrics with four different basis weights were coated graphene oxide (GO) by conventional dip coating method which is one of the most simple and effortless process in textile industry. The immersed an aqueous sodium dithionite solution order to obtain reduced (RGO) fabrics. obtained became electrically conductive very low surface electrical resistivity 5....

A simple high sensitive, selective, and rapid spectrophotometric method for the determination of trace gold based on the rapid reaction of gold(III) with bis(salicylaldehyde)orthophenylenediamine (BSOPD) in aqueous and micellar media has been developed. BSOPD reacts with gold(III) in slightly acidic solution to form a 1:1 brownish-yellow complex, which has an maximum absorption peak at 490 nm i...

*Correspondence: T. D. Silva. Departamento de Farmácia. Faculdade de Ciências Biológicas e da Saúde. Universidade Federal dos Vales do Jequitinhonha e Mucuri, Campus JK. Rodovia MGT 367, Km 583, n° 5000, 39100-000, Diamantina, MG, Brasil. E-mail: [email protected] Development and validation of alternative methods by non-aqueous acid-base titration and derivative ultraviolet spectrophoto...

2,10-Disubstituted phenothiazines are the best drugs in psychiatry. Several methods for their analysis have been reported in the literature. The official methods are based on non-aqueous titration or spectrophotometry. Various oxidizing agents have been used for the spectrophotometric determination of 2,10-disubstituted phenothiazines, e.g. Ce(SO4)2, NH4VO3, K2S208, KIO4, KIO3, KBrO3, FeCl3, Na...