Polyphosphates and fish: some chemical studies

Abstract
Summary: Polyphosphates are widely used for treating fish, but little information is available on the amounts taken up by fish and the suitability of some commercial polyphosphate mixtures. Phosphorus assays were performed on extracts of fish muscle which had been treated or not treated with polyphosphate mixtures. Fish‐to‐fish variation in natural phosphorus content was so large that it was difficult to determine whether or not fish had been treated with polyphosphate. The amount taken up under the conditions of treatment adopted was equivalent to 50–100 mg P/100 g fish muscle.Earlier experiments showed that sodium tripolyphosphate and sodium pyrophosphate were the most active condensed phosphates for preventing drip in prepacked chilled fish. The commercial mixtures found to give the best anti drip effect contained a high proportion of one or both of these two phosphates.

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