A colorimetric reaction for the quantitative estimation of nicotinic acid

A colorimetric reaction for the quantitative estimation of nicotinic acid.

The Quantitative Estimation of Nicotinic Acid in Animal Tissues

During the last few years the Konig reaction (1) between pyridine derivatives, cyanogen bromide, and aromatic amines has been made the basis of a number of procedures for the quantitative estimation of nicotinic acid in tissues. After extensive experience with several of these methods we have concluded that none is without severe defect and have attempted to formulate a more satisfactory proced...

The Quantitative Estimation of Nicotinic Acid in Animal Tissues

During the last few years the Konig reaction (1) between pyridine derivatives, cyanogen bromide, and aromatic amines has been made the basis of a number of procedures for the quantitative estimation of nicotinic acid in tissues. After extensive experience with several of these methods we have concluded that none is without severe defect and have attempted to formulate a more satisfactory proced...

Colorimetric Estimation of Indoleacetic Acid.

The wide use of the auxin, indoleacetic acid, in physiological and biochemical experiments has promoted interest in methods for its colorimetric estimation. MITCHELL and BRUNSTETTER (1) have proposed both the nitrite and the ferric chloride-sulphuric acid tests for the quantitative estimation of indoleacetic acid (IAA) in aqueous solutions, basing their suggested procedures upon a study of opti...

An improved colorimetric method for the quantitative estimation of thymine.

The Hunter (1) procedure was originally developed for the calorimetric d&&ion of minute amounts of thymine. In this procedure thymine is coupled under air with p-diazobenzenesulfonic acid in carbonate solut.ion, and a red color is subsequently produced by the addition of sodium hydroxide and hydroxylamine. Thymine was determined by this means in hydrolysates of dcsoxypentose nucleic acids (DNA)...