Synthesis of alpha-D-xylose-1-C-14 and beta-D-lyxose-1-C-14
نویسندگان
چکیده
منابع مشابه
A short synthesis of d-[1-(14) C]-serine of high enantiomeric purity.
Herein, we report a short, three-step synthesis of d-[1-(14) C]-serine (4) in high enantiomeric purity. Starting from [(14) C]-KCN and 2-(benzyloxy)acetaldehyde, Strecker reaction using (R)-1-phenylethylamine as the chiral auxiliary gave two diastereomeric aminonitriles 1 and 2 in the ratio of 4:3, which were conveniently separated and purified chromatographically. Following hydrolysis and subs...
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Various mechanisms have been proposed for the biological degradation of pentoses. On the basis of similarity of end-products from pentose and hexose fermentation, it has been suggested that the CS chain is converted to a Cg chain by addition of a C1 unit and that the resulting hexose is then degraded in the usual manner (1). A second theory proposed by Dickens (2) postulates stepwise shortening...
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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 ...
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14C-Fumonisin B(1) (FB(1)) was produced by Fusarium proliferatum M-5991 in modified Myro liquid medium and purified to >95% purity with a specific activity of 1.7 mCi/mmol. Nine male and nine female F344/N rats were each dosed by gavage with 0.69 micromol of (14)C-FB(1), (14)C-hydrolyzed FB(1), or (14)C-FB(1)-fructose/kg body weight. Urinary excretion of (14)C-FB(1) and (14)C-FB(1)-fructose was...
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Nitrogen-14 (spin I = 1) has always been a nucleus difficult to observe in solid-state NMR and until recently its observation was restricted to one-dimensional (1D) spectra. We present here the first 3D H–C–N NMR correlation spectrum. This spectrum was acquired on a test sample L-histidine HCl H2O using a recently developed technique, which consists in indirectly observing N nuclei via dipolar ...
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ژورنال
عنوان ژورنال: Journal of Research of the National Bureau of Standards
سال: 1954
ISSN: 0091-0635
DOI: 10.6028/jres.053.041