Microdetermination of dl-alanine. II. Microdetermination of l-glutamic acid, dl-valine, and dl alanine in a mixture in one solution without separating

Abstract

Abstract dl -Alanine was determined in micro amounts separately and in a mixture of dl -valine and l -glutamic acid in one solution directly. Sodium tungstate, gold chloride, and potassium tellurite form complexes with l -glutamic acid, dl -alanine, and dl -valine in the ratios of 1:2, 1:3, and 1:4, respectively. Potentiometric data and results in analysis support the complex ratios. Maximum errors in determinations of l -glutamic acid, dl -alanine, and dl -valine are 0.0, 1.4, and 0.16%, respectively. Ranges mg/liter) in which l -glutamic acid dl -alanine, and dl -valine were estimated in a mixture were 5.892 × 10 −4 to 14.730 × 10 −4 ; 4.6602 × 10 −4 to 18.6209 × 10 −4 ; and 11.6956 × 10 −4 to 29.2390 × 10 −4 respectively.