Evaluation of a simple colorimetric analysis for urinary malondialdehyde determination

The colorimetric determination of urinary lipase.

With the use of titrimetric (1)) manometric (2)) stalagmometric (3), and calorimetric (4, 5) techniques, the esterase and lipase activities of sera and many tissues have been measured by employing a wide variety of substrates (6). The vast amount of data that resulted from these studies contains numerous discrepancies in the behavior of these esterolytic enzymes, which are still unexplained. Tw...

The Colorimetric Determination of Urinary Estrin

Kober (1931) was the first to suggest a calorimetric test for urinary estrin. He compared the degree of red color developed after treatment with phenolsulfonic acid in a test sample with a standard cresol red solution. Cohen and Marrian (1934) modified the Kober procedure and determined the hormone content of estrone and estriol fractions by comparison with a standard curve from a set of determ...

A new simple semimicro method for colorimetric determination of urea.

Evaluation of a colorimetric method for determination of glycosylated hemoglobin.

We evaluated a colorimetric assay for glycosylated hemoglobin to determine the effects of several variables --oxalic acid concentration, extraneous glucose, hemoglobin concentration, hydrolysis interval, and 5-hydroxymethylfurfural destruction--and the precision. The interference seen when the blood glucose concentration exceeds 2.0 g/L (11 mmol/L) can be eliminated by washing the erythrocytes ...

A Simple Colorimetric Method for the Evaluation of Chitosan

A simple sensitive and rapid colorimetric method has been developed, and herein described, for the qualitative and quantitative chemical assessment of the commercially available chitosan products. The described method relies on the reactivity of the basic amino function of chitosan with the acid dye bromocresol purple. The applied technique allows assessment of variability and selectivity chang...