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单宁虽然广泛地存在于各种植物的不同器官中,但不同的植物种类、不同的树龄、不同的采取部位,以及不同的季节,单宁的含量差异甚大。例如栓皮栎的橡碗(壳斗),在5—10年的树龄,单宁的含量只有18.3％,而15年树龄则含27.3％。又如地榆的根,在4月间采收,单宁含量为12.8％,若8月间采收,单宁含量则为14.5％。在国际市场上,我国栲胶和国外栲胶在质量上差距主要是色泽深,除需在加工技术上进一步改进外,其根本原因还在于供给优质原料。例如我国的橡碗及化香果资源丰富,但收购到
Although tannin is widely found in different organs of various plants, the content of tannin varies greatly depending on the species of plant, the age of the plant, the site of application, and the season. For example, the cork oak (bowl) has a tannin content of 18.3% at 5 to 10 years and 27.3% at 15 years of age. Another example is the root of Burnet, harvested in April, tannin content of 12.8%, if harvested during August tannin content was 14.5%. In the international market, the gap between the quality of China’s gums and foreign gums is mainly the deep color. In addition to the need to further improve processing technology, the fundamental reason lies in the supply of high-quality raw materials. For example, China’s rubber bowls and incense rich resources, but the acquisition