Relative Activity of the Nonphosphorylated B-6 Vitamers for Saccharomyces uvarum and Kloeckera brevis in Vitamin B-6 Microbiological Assay
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چکیده
منابع مشابه
Neonatal epileptic encephalopathy: role of vitamin B-6 vitamers in diagnosis and therapy.
The term ‘‘vitamin B-6’’ refers to a group of naturally occurring pyridine derivatives represented by pyridoxine, pyridoxal, and pyridoxamine and their phosphorylated derivatives with similar physiologic actions. These 6 compounds are referred to as vitamin B-6 vitamers. The free forms of the vitamers could be converted to the key coenzymatic form pyridoxal phosphate (PLP) by the action of 2 en...
متن کاملB-6 vitamers and 4-pyridoxic acid in the plasma, erythrocytes, and urine of postmenopausal women.
BACKGROUND Although many studies have reported reduced vitamin B-6 status with aging, little information is available about the specific effects of menopause. OBJECTIVE We aimed to examine vitamin B-6 metabolism in premenopausal and early postmenopausal women. DESIGN We examined dietary intake and vitamin B-6 metabolites in the plasma, erythrocytes, and urine of 30 premenopausal women (x +/...
متن کاملRole of vitamin B 6 biosynthetic rate in the study of vitamin B 6 synthesis in Escherichia coli.
Nutritional auxotrophs of Escherichia coli synthesize vitamin B(6) compounds at a rate of 1 x 10(-10) to 2 x 10(-10) moles per hr per mg (dry weight) of cells when they are suspended in minimal medium lacking their required nutrients. A few auxotrophs have been found to stop or reduce vitamin B(6) synthesis during such an experiment. These include thiamineless, citrate synthaseless, and pyridox...
متن کاملPlate assay of thiamine. I. Using Kloeckera brevis.
Lactobacillus fermenti strain 36 is the most frequently used microorganism for the assay of thiamine both in the tube method, (Sarett and Cheldelin, 1944; Fitzgerald and Hughes, 1949), and in the plate method, (Bacharach and Cuthbertson, 1948; Jones and Morris, 1949). Other microorganisms have more recently been suggested for the tube assay; Hoff-Jorgensen and Hansen (1955) used the yeast Kloec...
متن کاملHyperhomocysteinemia in chronic alcoholism: correlation with folate, vitamin B-12, and vitamin B-6 status.
Serum homocysteine concentrations have been shown to be a sensitive functional indicator of intracellular folate, vitamin B-12, and vitamin B-6 status. Chronic alcoholism is known to interfere with one-carbon metabolism, for which the above vitamins serve as coenzymes. In the present study, these vitamins were assessed in 32 chronic alcoholics and 31 healthy volunteers by measuring blood vitami...
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ژورنال
عنوان ژورنال: The Journal of Nutrition
سال: 1982
ISSN: 0022-3166,1541-6100
DOI: 10.1093/jn/112.8.1643