Letter | Published:

An Unknown Amino-acid occurring in the Rock Lobster (Jasus lalandii)

Nature volume 169, page 968 (07 June 1952) | Download Citation

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Abstract

IN the course of an investigation (to be reported elsewhere) of press liquor, a waste product of the South African rock lobster industry, it was necessary to examine certain nitrogenous fractions. The solute in de-proteinized (trichloroacetic acid) press liquor was found to consist almost entirely of free amino-acids. A phenol/lutidine chromatogram showed an unknown substance giving a pink to pink-purple colour with ninhydrin. From its position on the chromatogram, it could be either methionine sulphoxide, or the ‘T-spot’ (β-aminoisobutyric acid) of Crumpler, Dent, Harris and Westall1. The first possibility was disproved by oxidation with hydrogen peroxide in the presence of molybdate; the unknown appearing in its usual position, unlike the sulphoxide, which is oxidized to the sulphone and appears elsewhere on the chromatogram.

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References

  1. 1.

    , , , and , Nature, 167, 307 (1951).

  2. 2.

    , and , Nature, 164, 441 (1949).

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    , , , and , J. Biol. Chem., 193, 881 (1951).

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Affiliations

  1. South African Council for Scientific and Industrial Research, National Chemical Research Laboratory, Pretoria. March 8.

    • L. NOVELLIE

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DOI

https://doi.org/10.1038/169968a0

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