Abstract
A reliable and accurate analytical method was developed and validated for the quantitative determination of polyphosphates (diphosphate, triphosphate, trimetaphosphate and tetrapolyphosphate) in products of animal origin (meat, dairy and fish products) by ion chromatography with suppressed conductivity detection. The chromatographic separations were accomplished by using an anion-exchange column eluted with a sodium hydroxide gradient. The method validation, performed according to Regulation 882/2004/EC and Decision 657/2002/EC, provided results conform with the European Directives with respect to linearity (R > 0.996), specificity, precision (CV ≤ 4.5 %), recovery (ranging from 87.2 to 101.1 %), detection and quantification limits and ruggedness. The method reliability was confirmed evaluating the method measurement uncertainty, lower than 7.5 % and by proficiency test results. Finally, the method ability to discriminate samples treated from those not-treated with polyphosphates was verified by analyzing commercial samples containing polyphosphates (cooked ham, wurstel, corned beef, processed cheese and surimi) or treated in-house with polyphosphates (pangasius fillets, shrimps and cuttlefishes).
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