TY - JOUR T1 - Estimation of alpha-amino nitrogen in plasma and urine by the colorimetric ninhydrin reaction JF - Journal of Clinical Pathology JO - J Clin Pathol SP - 150 LP - 153 DO - 10.1136/jcp.17.2.150 VL - 17 IS - 2 AU - D. M. Matthews AU - G. G. Muir AU - D. N. Baron Y1 - 1964/03/01 UR - http://jcp.bmj.com/content/17/2/150.abstract N2 - Methods are described for the estimation of plasma and urine α-amino nitrogen by the colorimetric ninhydrin reaction; in the method for urine, both ammonia and urea are separated by a rapid ion-exchange resin procedure. Two methods of estimation are given; one has the advantage of great simplicity, but involves the use of cyanide; in the other, cyanide is eliminated. Normal values are reported; they correspond well with those obtained by the gasometric ninhydrin method. ER -