DETERMINATION OF AMINO ACIDS BY THE SOLUBILITY PRODUCT METHOD

Solubility of amino acids, sugars, and proteins*

The importance of biomolecules is well recognized nowadays, owing to their application in many industrial processes, particularly in the food, pharmaceutical, and cosmetic industries. Amino acids, carbohydrates, and proteins are the three types of biomolecules considered in this review. Solubilities of several amino acids and sugars have been measured in water and, more recently, in mixed solve...

An Improved Method for the Determination of Amino Acids by Spectral Reflectance.

The Microbiological Determination of Amino Acids

After the development of methods for the determination of valine, leucine, and isoleucine (1) with LactobacilEus arabinosus 17-5 as the test organism, it was assumed that other amino acids essential for the growth of this organism could be determined by about the same procedure. However, it was soon discovered that glutamic acid is unique in its relationship to the growth of Lactobacillus arabi...

The Basic Amino Acids of Silk Fibroin. the Determination of the Basic Amino Acids Yielded by Proteins*

Previous investigations of the basic amino acids yielded by human hair and by wool (1, 2) showed that the keratins of these closely allied tissues yield relatively high proportions of arginine but very low proportions of hi&line; both tissues also yield high proportions of cystine. Because of this the determination of the basic amino acids presented special analytical difficulties that necessit...

Determination of D - and ~ Amino Acids by Ion Exchange

A procedure for the precise determination of the D and L isomers in a given sample of an amino acid has been based upon chromatographic separation of the diastereoisomeric dipeptides obtained by derivatization with an L-amino acid N-carboxyanhydride. The conditions for the preparation of dipeptides developed by Hirschmann and associates make the derivatization step simple and rapid; the couplin...