The Determination of Amino-acids with Ninhydrin 

 -  Analyst, 80(948), p.209-214, 1955 .
<br/><br/> The colorimetric method for the determination of amino-acids based on the reaction with ninhydrin has been systeniatically examined. It has been found possible to obtain a stoicheiometric reaction for most amino-acids with a quantitative yield of diketohydrindylidenediketohydrindamine, the probable end-product of the reaction, by a simple procedure suitable for routine analysis.