期刊名称：Journal of Nutritional Science and Vitaminology
印刷版ISSN：0301-4800
电子版ISSN：1881-7742
出版年度：1983
卷号：29
期号：5
页码：523-531
DOI：10.3177/jnsv.29.523
出版社：Center for Academic Publications Japan
摘要：A sensitive radioassay method has been developed to quantitate the activity of the folate-hydrolyzing enzyme which catalyzes the hydrolysis of folic acid to pteroic acid and glutamic acid. The method is based on analyzing [2-14C]pteroic acid separated by a thin-layer chromatography on an Avicel SF cellulose plate using 0.1M potassium phosphate buffer, pH 7.0, as a solvent. This method was found to be more sensitive than a conventional photometric method to determine the activity of the folate-hydrolyzing enzyme. High activities of the enzyme were found in Crithidia fasciculata ATCC 12857, Neurospora crassa IFO 6979 and rat liver. Smaller activities of the enzyme were widely distributed in other microbial cells and mammalian tissues.
关键词：folate-hydrolyzing enzyme;radioassay of pteroic aci;Crithidia fasciculata;Neurospora crassa;rat liver
