PREPARATION OF D-RIBOSE FROM D-ERYTHROSE BY CYANOHYDRIN REACTION
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Preparation of D-Psicose from D-Fructose by Immobilized D-Tagatose 3-Epimerase
D-Tagatose 3-epimerase (D-TE) from Pseudomonas sp. ST-24 immobilized on Chltopearl beads of BCW 2503 was used in the preparation of D-psicose from D-fructose. When D-fructose solution (10%) was passed through a column packed with immobilized D-TE about 20% of the D-fructose was converted to D-psicose. This column was continuously used for 10 d at 4PC and about 90 g of D-psicose were obtained fr...
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The oxidation of D-ribose and 2-deoxy-D-ribose by CrVI yields the aldonic acid and Cr3+ as final products when an excess of sugar over CrVI is used. The redox reaction occurs through CrVI→CrIII and CrVI→CrV→CrIII paths. The complete rate laws for the CrVI oxidation reactions are expressed by –d[CrVI]/dt = kH[H +]2 [ribose][CrVI], where kH = (5.9 ± 0.1) × 10–2 mol–3 dm9 s–1, and –d[CrVI]/dt = (k...
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Neither n-ornithine nor n-citrulline has yet been described.’ A preparation of n-arginine by the action of arginase on racemic arginine was reported by Riesser in 1906 (2). For the ready preparation of these isomers, it was considered simplest to resolve DL-ornithine and to synthesize n-citrulline and n-arginine from n-ornithine by available procedures. The resolution of racemic ornithine was e...
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A very efficient route to the diastereoselective synthesis of polyhydroxy pyrrolidines, piperidines and azepanes from an aldehyde derivative of ribose is reported. Asymmetric α-amination of aldehydes using proline catalysed hydrazination is the key step in the synthesis. The method utilizes the stereocenters present in ribose and the extra carbon atoms present in the target molecules are incorp...
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ژورنال
عنوان ژورنال: THE JOURNAL OF VITAMINOLOGY
سال: 1965
ISSN: 0022-5398
DOI: 10.5925/jnsv1954.11.159