云南核桃油的特征指标及脂肪酸组成分析研究

Analysis and research on the characteristic index and fatty acid component of yunnan walnut oil

对采自云南省核桃主产地的9个核桃样品所提取核桃油以及直接采集的15个成品核桃油样品的主要特征指标和脂肪酸组成进行分析测定。结果显示:核桃油样品的折光指数为1.475～1.477,相对密度为0.916～0.924,碘值为143.7～152.2,皂化值为189.0～200.6;核桃油样品的脂肪酸组成:棕榈酸含量3.08%～7.91%(平均5.79%),硬脂酸含量1.48%～2.75%(平均2.13%),油酸含量17.45%～25.57%(平均21.83%),亚油酸含量56.97%～66.12%(平均61.58%),亚麻酸含量6.30%～9.65%(平均7.7%),三种不饱和脂肪酸含量占检测脂肪酸总量的91%以上。

Main characteristic index and fatty acid component of walnut oil extracted from 9 walnut sam- ples planted in Yunnan and 15 walnut oil samples directly collected from market were analyzed and test- ed. The result showed that the refractive index of walnut oil was 1. 475 - 1. 477, relative density 0.916 - 0. 924, iodine value 143.7 -152.2, saponification value 189.0 -200.6. The fatty acid component of walnut oil sample was palmitic acid 3.08% -7.91% （ average 5.79% ）, stearic acid 1.48% -2.75% （ average 2. 13% ）, oleic acid 17.45% - 25.57% （ average 21. 83% ）, linoleic acid 56.97% - 66. i2% （ average 61.58% ）, linolenic acid 6.30% - 9.65% （ average 7.7% ） , the content of three un- saturated fatty acids accounts for more than 91% of total tested fatty acid.