Adulteration identification method for cod-liver oil

Abstract

The invention relates to an adulteration identification method for cod-liver oil. The adulteration identification method comprises the following steps: performing peak area determination on fatty acidin the cod-liver oil and fish oil for adulteration by adopting precolumn derivatization capillary gas chromatography, calculating the percentage of typical fatty acid relative to total fatty acid according to an area normalization method and establishing a threshold, wherein the threshold of vegetable fatty acid references to national standards; finding out fatty acid with characteristic indexesby comparing the threshold of the fatty acid in the cod-liver oil with that of the fatty acid in the oil for adulteration; rapidly identifying the adulterated fish oil in the cod-liver oil by establishing a two-dimensional adulteration model of characteristic fatty acid and drawing an adulteration identification analysis chart; rapidly identifying adulterated vegetable oil in the cod-liver oil byadopting linoleic acid in the vegetable oil as a characteristic index and analyzing and comparing the content of the linoleic acid in a sample with the threshold of the cod-liver oil. The adulterationidentification method based on the characteristic indexes of the fatty acids in the cod-liver oil, the fish oil and the vegetable oil, provided by the invention, has the characteristics of science, accuracy, simplicity and convenience.

Description

technical field [0001] The invention relates to the quality identification of cod liver oil, in particular to a cod liver oil adulteration identification method which can effectively regulate the adulteration chaos existing in the cod liver oil market and can quickly and accurately identify it. Background technique [0002] Cod liver oil is oil extracted from deep-sea cod livers in Norway and other countries at high latitudes. Cod is not omnivorous, clean, and pollution-free. The extracted cod liver oil is of high quality and safe. Cod liver oil is rich in natural vitamin A and vitamin D 3 And a variety of omega-3 unsaturated fatty acids (DHA, EPA, DPA) that are not available on land, among which DHA (docosahexaenoic acid) and EPA (eicosapentaenoic acid) are very high in content, which is the body's own inability Synthetic but indispensable important nutrients, especially DHA, is the main element for the growth and maintenance of the human nervous system, an important compo...

AI Technical Summary

Problems solved by technology

Pure cod liver oil has a shortage of natural resources and is expensive. Unscrupulous manufacturers mix a certain proportion of cheap fish oil or vegetable oil in cod liver oil to reduce costs, which seriously damages the interests of consumers.

Regulatory reliance solely on the determination of signature components vitamins A and D 3 content, and the content (ratio) of DHA and EPA is not enough, illegal manufacturers can synthesize vitamin A and D by adding 3 , Ethyl DHA makes each symbolic component in cod liver oil meet the index requirements, but it is actually adulterated cod liver oil, and it is difficult to identify whether it is true or false

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