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Clinical Chemistry, Vol 15, 154-161, Copyright © 1969 by the American Association for Clinical Chemistry
-Amino Acids
1 West Virginia University Medical Center, Department of Pharmacology, Morgantown, W. Va. 26506.
An automated system for the determination of the L-
form of the majority of amino
acids is presented. The method is based upon oxidative deamination of the amino acid
coupled with oxidation of o-dianisidine by hydrogen peroxide. This procedure can be
used comparatively for the determination of a mixture of L-
-amino acids or for the
majority of separated L-
-amino acids (especially in conjunction with column separations from urine and blood which give falsely positive identification with ninhydrin
detection). The stereospecific nature of the L-
-amino acid oxidase enables the
investigator to quantitate the amount of L-
-amino acid in the presence of the D-
form. From an academic viewpoint, the extreme sensitivity and wide range of the
detection system make it advantageous for the study of the enzyme itself. This
automated method also may be employed to follow enzymatic reactionse.g., those
catalyzed by peptidases or racemases. The methodology is extremely convenient with
good reagent stability and is much more sensitive than manometric technics.
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