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The food additive polyvinylpolypyrrolidone is approved for use as a filter aid. The water-soluble substances test of polyvinylpolypyrrolidone often shows poor reproducibility. The instruction "boil gently while stirring using a stirrer" was considered critical, and so this issue was examined. The results showed that the use of a combination of both an oil bath and a stirrer provided good reproducibility without decomposition or other problems.

shokuhin eiseigaku zasshi/shokuhin eiseigaku zasshi

Study on Extraction Conditions of Water-Soluble Substances &mdash;Purity Test (4) for Polyvinylpolypyrrolidone Listed in Japan's Specifications and Standards for Food Additives&mdash;