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普通鑑别油类都依靠理化学特性及各种常数的测定。桐油的比重、折光指数、碘价均较一般植物油为高,但由于混杂量不多,理化常数的变动亦不大,不容易区别,因之在检验上就有些困难。桐油的化学组成与别种植物油不同。根据文献记载,我国桐油中含有的甘油脂酸酯是由饱和胆酸4%、油酸5%、亚麻油酸1%及桐酸90%所组成的。桐酸为十八碳王烯(9∶11∶13)酸,含有三个双键的不饱和脂酸(C_(17)H_(31)COOH),容易吸收氧气,发生聚合作用而干固,加热时作用更快。根据这个道理,在检
Ordinary identification of oils depends on the determination of chemical and chemical properties and various constants. The specific gravity, refractive index, and iodine value of tung oil are all higher than those of common vegetable oils. However, due to the small amount of contaminants, the variation in physicochemical constants is not large, and it is not easy to distinguish them. Therefore, it is somewhat difficult to test. The chemical composition of tung oil is different from that of other vegetable oils. According to the literature, the glycerol esters contained in tung oil are composed of saturated cholic acid 4%, oleic acid 5%, linoleic acid 1% and eleostearic acid 90%. The eleostearic acid is an octadecanolone (9:11:13) acid and contains three double bonds of unsaturated fatty acids (C_(17)H_(31)COOH), which easily absorbs oxygen and undergoes polymerization to dry out. The effect is faster when heated. According to this principle,