منابع مشابه
Synthesis of C14-Labeled L-Sorbose and L-Ascorbic Acid
A m ethod is prese nted for preparing C'4-l abeled L-ascorbi c acid (vi tamin C) from labeled banum D-gluconate or D-glucose. The process is adapted from t he commercial synthesis of vi tamin C t hrough sorbitol, L-sorbose and potassium di-O-isopropylidene-2kelo-L-guloll.ate. In .th e cyanohydrin . synt hesis of labeled D-glucose, barium D-gluconate is used as an lI1term ed~at~ . Fo: prepanng l...
متن کاملPlasma Protein Labeled with Lysine-ε-c14
The metabolism of homologous plasma proteins, labeled with lysine-epsilon-C(14), after oral administration to dogs has been investigated. The speed of the various processes involved is indicated by the maximum rate of C(14) O(2) excretion which is attained within 1 to 4 hours, the prompt appearance of protein activity in the plasma and disappearance of non-protein activity from it, both virtual...
متن کاملIncorporation of C14-labeled substrates into violacein.
Previous studies on the physiological aspects of violacein biosynthesis (DeMoss and Evans, 1959) suggested that only L-tryptophan would serve as the primary source of carbon for pigment formation by Chromobacterium violaceum. In view of the pigment structure suggested by Ballantine et al. (1958), 5-[3-(5-hydroxyindolyl)]-3-(3-isatinyl)-2-pyrrolone, it seemed advisable to determine the actual so...
متن کاملSynthesis of ring labeled [ 1 ’ - 14 C ] - L - tyrosine Ryszard
The enzyme β-tyrosinase (tyrosine phenol lyase, EC 4.1.99.2) has been shown [8, 9, 15] to catalyze the decomposition of L-Tyr to phenol, pyruvate and ammonia. Under some conditions, this enzyme also participates in the reverse reaction leading to formation [10, 12, 13] of L-Tyr (Scheme 1). As a metabolism of L-Tyr is an important process of the living cells, the mechanism of the above reaction ...
متن کاملSynthesis of pyrrolidine ring of nicotine from several C14-labeled metabolites by Nicotiana rustica.
The pyrrolidine ring of nicotine has been shown to be formed from ornithine, glutamic acid, and proline (l-5). Although little information is available concerning the interrelationship of these three amino acids in higher plants, Al-pyrrolinedcarboxylate (in equilibrium with glutamic semialdehyde) has been shown to be a key intermediate in their interconversion in animals and microorganisms (6,...
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ژورنال
عنوان ژورنال: Science
سال: 1947
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.105.2721.208