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A simple procedure which yields pure xylitol-5-phosphate is described. A cell extract ofLactobacillus casei Cl-16 from a 6-liter culture was used to synthesize up to 70 mg of xylitol-5-phosphate overnight from xylitol and phosphoenolpyruvate via a xylitol phosphoenolpyruvate:phosphotransferase system with a 53% yield. Centrifugation, filtration, precipitation as a barium salt, and ion-exchange batch chromatography permitted recovery of nearly 90% of the phosphorylated product synthesized. Thin-layer chromatography and enzymatic analysis indicated a purity level of more than 99%. The method was used to synthesize [U-14 C]xylitol-5-phosphate, and it is suitable for the synthesis of many other nonmetabolizable sugar phosphates.

Preparation and Purification of Xylitol-5-Phosphate from a Cell Extract of Lactobacillus casei Cl-16