About: Color reaction is a research topic. Over the lifetime, 1194 publications have been published within this topic receiving 19579 citations.
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TL;DR: The chapter focuses on the later modifications for the determination of DNA especially in microorganisms and animal tissues and presents the modifications described by Burton, Croft and Lubran, and Giles and Myers.
Abstract: Publisher Summary This chapter discusses the determination of DNA concentration with diphenylaraine and describes several other color reactions for DNA. The reaction between deoxyribose and diphenylamine is probably the most frequently used color reaction for the determination of DNA. The chapter focuses on the later modifications for the determination of DNA especially in microorganisms and animal tissues and presents the modifications described by Burton, Croft and Lubran, and Giles and Myers. Croft and Lubran were measuring the DNA in saline washes of human stomachs. The material has a high content of sialic acid, which seriously interferes in several color reactions for DNA, including Button's modified diphenylamine reaction. Sialic acid reacts in this method to give a color with a maximum absorption at 550 mμ. Giles and Myers found that the blank readings could be reduced by omitting the sulfuric acid and adding the acetaldehyde to the individual tubes. They also obtained a worthwhile increase of sensitivity by increasing the concentration of diphenylamine and altering the relative volumes of sample and reagent. Giles and Myers encountered turbidities in their reaction mixtures due to impurities in DNA extracts from plant tissues.
TL;DR: The serum total and free cholesterol levels of 200 blood donors measured with the new color reaction were found to agree well with normal values reported by others and validates its use for either clinical or research purposes.
01 Jan 1971
TL;DR: A modified method for the assay of serum phosphatase activity utilising disodium phenyl phosphate as substrate, based upon the reaction of free phenol with 4-amino-antipyrine and alkaline potassium ferricyanide is described.
Abstract: A modified method for the assay of serum phosphatase activity utilising disodium phenyl phosphate as substrate is described. This is based upon the reaction of free phenol with 4-amino-antipyrine and alkaline potassium ferricyanide. Study of the kinetics of the colour reaction has led to an alteration in the concentration of the reagents used; the colour is formed instantaneously and shows a very slow rate of decay. Sodium arsenate incorporated with the amino-antipyrine reagent effectively abolishes further enzyme activity and prevents the dilution of the colour inherent in earlier methods.
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