FLOW-INJECTION ANALYSIS OF PHYTIC ACID BY A MODIFIED MOLYBDENUM BLUE METHOD

A simple and rapid flow-injection analysis (FIA) of phytic acid in cer eal food samples is reported based on a modified molybdenum blue metho d. The interference from inorganic phosphate ion was eliminated by usi ng an anion exchange resin. The samples treated with the ion exchanger s were analysed using an FIA system at a sampling rate of 60 samples p er hour, and the determination showed a working range from 0.05 to 2.0 x 10(-3) M of phytic acid. The method was highly reproducible for mea suring phytate in food material and proved to be more rapid than conve ntional methods. (C) 1998 John Wiley & Sons, Ltd.