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Asini Corii Colla (ACC) (namely donkey hide gelatin, E'jiao in Chinese) was one of the most valuable tonic traditional Chinese medicines which is an infallible remedy to promote hematopoiesis. It should be produced by fresh or dried donkey hide according to Chinese Pharmacopeia (2015 edition) with a long-time decoction, while as donkey and horse (or mule) all belong to equids so their hides or their hide gelatins are share much in common, that cause the difficult in distinguishing raw materials donkey hide from horse/mule hide for manufacturer, and the challenge in the quality evaluation of ACC for regulatory authority to identify the adulterated with horse hide.

Identification of the adulterated Asini Corii Colla with cytochrome c oxidase subunit I gene-based polymerase chain reaction