医薬品および食品添加物用縮合リン酸塩の分析とその性質

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Eight articles (made by 6 makers) of poly-, meta-, and ultraphosphate, being available commercially as condensed phosphates for medicinal and food additives, were submitted to the following tests : determination of phosphorus, pH of 1% solution, solubility, hygroscopic test, hydrolysis, and determination of phosphates with various chain lengths in condensed phosphates by means of anion-exchange chromatography. 1) P_2O_5 contents of poly- and metaphosphate, though somewhat variations were detected one another according to their makers, lay in the range of 66-69%, while those of ultraphosphate in the range of 71-77%. 2) Even the same metaphosphate or ultraphosphate, their solubility largely differed one another according to their makers. In some cases, the same articles of the same maker largely differed in their solubility rates, from one lot to another. It was found that the solubilities of poly-, meta-, and ultraphosphate depend strongly on the content of long- chain polyphosphates in them. 3) In the hygroscopic test, poly- and metaphosphates absorbed moisture little. However, ultraphosphate showed a strong hygroscopic property. The higher the P_2O_5 content of the condensed phosphates, the stronger was the hygroscopic property. 4) It was found from the results of anion-exchange chromatography that commercially available poly-, meta-, and ultraphosphates were mixtures of phosphates with various chain lengths. It was also ascertained that poly- and metaphosphates containing larger amounts of long-chain phosphates above undecaphosphate (P_<11>) were lower in their solubility rates as well as in their hydrolysis rates.
公益社団法人日本薬学会の論文
1984-07-25

医薬品および食品添加物用縮合リン酸塩の分析とその性質

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