Seed oil content and fatty acid composition analysis of four main hemp plant
In order to investigate the development and utilization value of seed oils of four main hemp plants ramie,kenaf,hemp and flax,the oil contents of seeds and fatty acid compositions and contents of seed oils were comparatively studied by Soxhlet extraction and GC.The results showed that the difference in seeds oil contents of the four hemp plants were greater,and the oil content of flax seed was the highest,followed by hemp seed,kenaf seed and ramie seed,and their mean values were 36.54％,33.43％,23.44％ and 18.77％,respectively.Palmitic acid,stearic acid,oleic acid,linoleic acid and linolenic acid were the main fatty acids in the four hemp plant seed oils,accounting for over 97.40％ of the total fatty acids content,and the change range of mean value of unsaturated fatty acids in the oils was 74.87％-92.43％,in which ramie seed oil was the highest,followed by flax seed oil and hemp seed oil,kenaf seed oil was the lowest.Compared with fatty acid compositions of other vegetable oil,the four hemp plant seed oils had their own characteristic advantages.Kenaf seed oil contained the highest oleic acid (30.09％),significantly higher than the other three hemp plant seed oils,sunflower seed oil and soybean oil;ramie seed oil contained abundant of linoleic acid (81.38％),much higher than sunflower seed oil,soybean oil,rapeseed oil,olive oil and the other three hemp seed oils;flax seed oil and hemp seed oil had obvious advantages of linolenic acid content,which were 51.27％ and 18.47％respectively,much higher than kenaf seed oil,hemp seed oil and other four vegetable oils.Comprehensive analysis showed that there was important value and great application potential of four main hemp plant seeds for the development and utilization of special health edible oil.
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