METHOD OF DETERMINING CONTENT OF POLYCHLORINATED BIPHENYLS IN FOODS Russian patent published in 2005 - IPC

FIELD: analytical methods in food industry.

SUBSTANCE: method of determining weight concentrations of toxic polychlorinated biphenyls in foods comprises: destruction and dissolution of weighed sample of food product by boiling sample mixed with potassium hydroxide and ethanol; extraction of polychlorinated biphenyls from thus obtained solution with hexane; concentration of polychlorinated biphenyls by evaporating extract; purification of resulting concentrate on chromatographic column filled with phlorhizyl; and determining polychlorinated biphenyls in concentrate with standard procedures and devices involving capillary gas-liquid chromatography provided with electron capture detector. More particularly, sample of food product is destroyed by boiling it in 7.5±0.5% potassium hydroxide in 96% ethanol, freshly obtained solution of sample is cooled to temperature not higher than 25°C for not longer than 30 sec, and polychlorinated biphenyls are then extracted utilizing consecutive four-step procedure.

EFFECT: extended spectrum of controllable food products, improved quality and reliability of controlling polychlorinated biphenyls in foods.

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