脂肪酸是油脂的重要组成部份,不同脂肪酸组成及含量决定着油脂的工业用途。桐油中除含有一般植物所具有的十六碳酸、十八碳酸外,还含有大戟科油桐属植物油的特异酸——桐酸,它使桐油具有特殊的工业用途并直接影响到油质的优劣。为给生产和科研提供科学依据,1979、1980年我们对油桐主要农家品种的脂肪酸组成进行了分析研究。一、材料与方法试材来自川、滇、粤、桂、鄂、湘、赣、浙、豫、苏、鲁等11个省(区),均为当地的主栽农家油桐品种,共计33份(包括千年桐、三年桐)。样品处理方法;将样品在105℃烘箱中烘30分钟,剥壳,将桐仁刨成薄片放于扁型称量瓶,在65℃、700mmHg真空干燥箱烘8小时,然后用直滴式索氏抽提器测含油量。从抽出油样中取0.1克放入带瓶塞的10毫升试管中,并放入7毫升5/10000 B、H、T、甲醇溶液,保存在冰箱内。脂肪酸测定液制备:将装有0.1克油样的5/10000 B、H、T、甲醇溶液加2毫升石油醚,振荡5分钟后,取50微升,加1毫升0.4N Fatty acids are an important part of the fat, different fatty acid composition and content of the oil determines the industrial use. Tung oil contains in addition to the general plant with the hexadecanoic acid, octadecanoic acid, also contains Euphorbiaceae tung oil-specific acid - Tong acid, which makes tung oil has a special industrial use and directly affects the quality of the oil Pros and cons. In order to provide a scientific basis for production and scientific research, in 1979, 1980, we analyzed the fatty acid composition of the main farm varieties of tung oil. Materials and Methods The test materials came from 11 provinces (districts) of Sichuan, Yunnan, Guangdong, Guangxi, Hubei, Hunan, Jiangxi, Zhejiang, Henan, Jiangsu and Shandong provinces, (Including Millennium Tong, San Tong). Sample processing method; the sample baked in an oven at 105 ℃ for 30 minutes, peeled, the Tong Ren planing into flat weighing bottle, at 65 ℃, 700mmHg vacuum drying oven for 8 hours, then use a straight drop cable Extractor measured oil content. Take 0.1 g of the extracted oil sample into a 10 ml tube with stopper and place in 7 ml of 5/10000 B, H, T, methanol solution and store in refrigerator. Fatty acid determination of liquid preparation: Will be loaded with 0.1 grams of oil sample 5/10000 B, H, T, methanol solution plus 2 ml of petroleum ether, shaking for 5 minutes, take 50 microliters, add 1 ml 0.4N