Abstract
Donkey-hide gelatin (Ajiao in Chinese) is a gelatin drug, which is the dry glue pieces made from the hide of Equus asinus L. (family Equidae), and used to tone the blood, arrest bleeding, nourish yin and prevent dryness. After a series of processes of the hide: washing, soaking, plucking, rinsing and stewing, the collagen of the donkey hide was hydrolyzed into a mixture of polypeptides. It is used unprepared, or stir-baked with oyster shell powder or cat-tail pollenpowder into small glue balls for use. In China, bovine and porcine hides are also used as the gelatin drug. The similarity between different gelatins makes it difficult to trace their species origin[1].
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