HE RENEWED INTEREST in magnesium alterations in human disease states has originated a search for simpler and more accurate analytic technics for the determination of magnesium in body fluids. Several recent methods are based upon the chelating reaction of ethylenediamine tetraacetic acid (EDTA). A procedure for the determination of magnesium in erythrocytes (1) involving spectrophotometric titr...

A multiwavelength spectrophotometric (WApH) titration method for determination of acid dissociation constants (pK(a) values) of ionizable compounds developed previously was applied in the case of pyridine derivatives of pharmaceutical interest. Specifically, UV absorption spectra of the drug solution are acquired in the course of a pH-metric titration using an optical device based on a fibre op...

ABSTRACT. The present work was aimed to determine the contents of ascorbic acid and antioxidant activity eight types common fruits commercially available in Addis Ababa, Ethiopia using iodometric titration UV-Vis spectrophotometric methods, respectively. were found range 15.41 mg/100 g grapes 78.01 papaya. highest papaya (89.41) lowest water melon (31.28) mg equivalent per 100 edible part fruit...

1. A convenient spectrophotometric assay for the determination of l-ergothioneine in solution including deproteinized blood haemolysate was developed. 2. The method consists of deproteinization by heat precipitation and Cu(2+)-catalysed oxidation of thiols such as glutathione and of l-ascorbic acid, both in alkaline media, and titration of l-ergothioneine (which is not oxidized under these cond...

The application of evolving projection analysis (EPA) to second-order bilinear data sets consisting of more than two components is described. EPA is a method for rank analysis of ordered data matrices where the components appear sequentially as a function of time or some other ordinal variable. It was found that extension of the method to mixtures of more than two components was best accomplish...