Abstract
ABSTRACTAn ion chromatographic method to determine phytic acid in foods, which allows for the direct injection of extracts into the column without need of a prepurification step, was developed. Infant formula powder, soy flour, soy isolate, wheat bran, and wheat bread were analyzed using the new ion chromatographic method and an ion exchange method. Phytic acid determined with the ion chromatographic method ranged from 0.2% for infant formula powder to 3.28% for wheat bran. The generally lower values found using the ion chromatographic method compared to the ion exchange method are attributed to the measurement of interfering substances such as breakdown products of phytic acid by the ion exchange procedure.
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