Dyer’s colorimetric procedure was applied to the determination of trimethylamine nitrogen (TMA-N) in distillates from frozen cod and frozen haddock. Studies show that a more accurate estimate of the TMA-N contained in fish is obtained when this colorimetric method is applied to the distillates rather than to the extract. The method is also shortened by the elimination of one distillation, two oxidations, and two titrations.
Analysis of eggs by the AOAC official methods demonstrated the presence of previously unreported components in decomposed eggs. Using column partition, gas chromatography, and gas chromatography with a mass spectrometer, isovaleric acid was established as one of the unknown components in incubator reject eggs.
Free succinic acid can be determined in eggs by gas-liquid chromatography, using a flame ionization detector, after prior extraction of the acid from the sample by ether. Decomposed or incubator reject eggs all exhibited sample peaks with the same retention time as succinic acid, while undecomposed eggs showed no peaks.
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