Fernández-López JA, Latres E, Remesar X, Alemany M. A radio-enzymatic method for the estimation of L-leucine-specific radioactivity.
JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 1993;
26:291-7. [PMID:
8409201 DOI:
10.1016/0165-022x(93)90030-r]
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Abstract
A method is presented for the estimation of L-leucine concentration and radioactivity in biological samples. The sample L-leucine is specifically bound to tRNA and its radioactivity estimated in the presence of either added labelled L-leucine or cold L-leucine (in the same proportion), as well as in the presence of a large excess of cold L-leucine. The latter gave the measurement of non-leucine radioactivity present in the sample. The measurements in the presence and absence of labelled/cold L-leucine allowed the estimation of L-leucine levels and radioactivity by using a simple set of calculations and a standard curve built with known cold L-leucine concentrations in the presence of a fixed known amount of [14C]L-leucine.
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