Tannin is a kind of polyphenolic compounds with very important value in use. In this review, tannins’main natural source, physical and chemical properties, extraction technology and applications are summarized to provide a reference for further development and utilization.%单宁是一种多元酚类化合物，具有十分重要的利用和开发价值。本文主要综述了单宁的自然来源、理化性质、提取技术及应用，为单宁的进一步开发和利用提供参考。
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