Composition of Ribes stenocarpum Maxim Seed Oil and the Optimization of Crude Oil Refining Process
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Graphical Abstract
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Abstract
Taking Ribes stenocarpum Maxim seed oil in Qinghai area as the research object, the unsaponifiable matter and fatty acid composition were analyzed. At the same time, the seed oil hydration degumming, adsorption decolorization, and adsorption deacidification processes were optimized with the help of single factor and response surface tests. The physical and chemical indexes of seed oil before and after refining were compared to clarify the composition of Ribes stenocarpum Maxim seed oil and the better refining technology in Qinghai, and expand the development and application of Ribes stenocarpum Maxim seed oil in Qinghai. The results showed that there were 8.78% phytosterols and a certain amount of sitosterol and neophytodiene in the seed oil of Ribes stenocarpum Maxim, and 8 fatty acids were detected, of which 88.89% were unsaturated fat, and the contents of oleic acid and linoleic acid were relatively high, 37.09% and 50.80%, respectively. The results of response surface methodology showed that the optimum degumming conditions were as follows: hydration time 16 min, addition of phosphoric acid 0.3%, addition of water 3.0%, degumming temperature 50 ℃, the optimum conditions of decolorizing were decoloring time 20 min, addition of decolorizing agent 7.0%, and decolorizing temperature 51 ℃, the optimum conditions of deacidification were 87 min, 2.0% of microcrystalline cellulose and 40 ℃. Under these conditions, the degumming rate, decoloring rate and acid removal rate of Ribes stenocarpum Maxim seed oil were 80.48%, 66.48% and 71.30% respectively. After refining, the acid value and optical density of the seeds oil of Ribes stenocarpum Maxim decreased greatly, the iodine value and saponification value decreased slightly, and the peroxide value increased slightly, the results showed that this refining process had certain effect on the nutritive value of oil, but it could improve the sensory quality of Ribes stenocarpum Maxim seed oil, and was beneficial to the storage of oil and could be used for refining of Ribes stenocarpum Maxim seed oil.
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