title: Preparation of high-specific-activity D-[3-3H]pantothenic acid.
abstract: High-specific-activity D-[3-3H]pantothenic acid (5 Ci/mmol) was prepared from commercially available beta-[3-3H]alanine employing Escherichia coli strain DV1 (panD2 pan F1). This strain is defective in beta-alanine synthesis and pantothenate uptake, and under appropriate growth conditions converted 85 to 90% of the input beta-[3-3H]alanine to extracellular D-[3-3H]pantothenate. The radiolabeled vitamin was purified from the medium by thin-layer chromatography followed by reverse-phase high-performance liquid chromatography. The overall yield of D-[3-3H]pantothenic acid was 30% and radiochemical purity was greater than 99%.
mesh_terms: D000409:Alanine / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D004926:Escherichia coli / Q000378:metabolism; D007553:Isotope Labeling / Q000379:methods; D010205:Pantothenic Acid / Q000096:biosynthesis* / Q000302:isolation & purification; D010770:Phosphotransferases / Q000378:metabolism; D017853:Phosphotransferases (Alcohol Group Acceptor); D014316:Tritium
chemical_list: D014316:Tritium; D010205:Pantothenic Acid; D010770:Phosphotransferases; D017853:Phosphotransferases (Alcohol Group Acceptor); C023088:pantothenate kinase; D000409:Alanine