Abstract:Abstract：The extraction and purification technology of 8 synthetic pigments （new red，lemon yellow，amaranth，carmine，sunset yellow，allure red，brilliant blue，erythrosine）which contained in decorated cakes and their detection method by high performance liquid chromatography were studied.The samples were first degreased by petroleum ether，precipitated by zinc acetate（21.9%，mass fraction）and potassium ferrocyanide（10.6%，mass fraction）solution，and extracted by ethanol-ammonia （7 ∶3 volume ratio），then purified by solid phase extraction column of polyamide.After that，high performance liquid chromatography was used to detect the contents of the 8 synthetic pigments.The standard curves of the eight kinds of synthetic pigments were obtained with more than 0.999 of correlation coefficients in their concentration gradients.The recoveries of standard addition of the samples were between 83.1%-99.7%and the relative standard deviations were between 0.767%-6.626%.The results indicated good recovery rates and precisions.