Abstract
In order to clarify the foods that contain condensed phosphates (CP), a newly simplified analytical procedure was adopted. Orthophosphate (OP) and CP were extracted from each sample with ice-cold 10% trichloroacetic acid. Two columns of ion-exchange resin per sample were prepared. The extract was loaded on both columns and OP was eluted with 0.2 M potassium chloride (KCl). OP in the eluate was extracted as a molybdenum complex and measured photometrically. From one column, CP were eluted with 20 ml of 2 M KCI. Qualitative analysis of CP was carried out with this eluate. Whenever CP were detected, subsequent fractionation was carried out using the remaining column. Color development of CP in each fraction as molybdenum blue was done in order to estimate their contents photometrically. OP was detected in all samples analyzed, but CP were sometimes not present. CP were found in the following foods; mashed potato, soybean products, boiled vegetables, frozen shellfish, cuttlefish products, canned crab, dried fish, fish paste, ham, sausage and cheese. The types and contents of CP varied from one food to another. It is suggested from these findings that intake of CP would result from consumption of these foods.
