| Production of Lycium barbarum L. in China ranked first in the world, theprocessing proportion shows the tendency of increase year by year. With the growth ofLycium barbarum juice and wine, amounts of Lycium barbarum waste of resourcescaused by environmental pollution and waste problems have become increasinglyprominent. Lycium barbarum seeds is the main component of the residue, with25%ofoil content, which contains90%of unsaturated fatty acid, is an excellent oil resources.Therefore, the research and development of Lycium seed oil can not only solve theproblem of waste pollution, but also has great economic and social benefits.This thesis in Lycium barbarum seeds as raw materials, the use of supercriticalfluid extraction method to extract Lycium barbarum seed oil, through single factorexperiment and response surface method to obtain the optimal process conditions. Thephysical and chemical properties and nutrients, fatty acid composition of seed oil wereanalysisd. To increase resistance to storage of Lycium barbarum seed oil, expanding thescope of the processing and application, the spray drying method is adopted to researchon microcapsules, and analysis of the oxidation resistance of microcapsule products. Forincreased Lycium barbarum seed oil of storability, expanded processing applicationrange, used spray dry law on its for microcapsule of research, and analyzed theantioxidant of microcapsule product.Response surface methodology was employed to optimize the supercritical carbondioxide extraction conditions of Lycium barbarum seed oil. On the basis ofone-factor-at-a-time experiments, a center composite Box-Behnken design was utilizedby response surface methodology. Statistical methods was used for secondary multipleregression equation model of significance test. We discussed the interaction betweenvarious factors, and the mathematical simulation and prediction of test results. Theoptimal extraction conditions were found as follows:extraction pressure37.8MPa,extraction temperature38.4℃and extraction time41min, resulting in an oil yield of21.66%, oil extraction of pilot test was19.59%. At the same time also by solventextraction and ultrasonic assisted extraction Lycium barbarum seed oil.The physical and chemical properties of Lycium barbarum seed and seed oil wereanalysisd. Lycium barbarum containing3%seeds, including seed number about42.Each hectogram Lycium barbarum seed contained moisture, ash content, crude proteinand crude fat is4.71g,25.9g,3.12g and19.9g, respectively. Through analysis and comparison, supercritical fluid extraction of oil get golden color, transparent,odorless, acid value, peroxide value in edible oil sanitation standards. Solvent extractionand ultrasonic assisted method to extracted the seed oil of colour and lustre is deep,residual solvent heavier taste. Worst oil quality ultrasound-assisted method whichobtained an acid value of9.89mgKOH/g, rancidity serious. Supercritical fluid extractionmethod of Lycium barbarum seed oil physical and chemical indicators are: therefractive index of1.4812, relative density0.926,1.47%moisture and volatile matter,acid value2.08mgKOH/g, peroxide value0.57mmol/kg, saponification value88.67mgKOH/g. By gas phase analysis of Lycium barbarum seed oil, fatty acids werepalmitic acid, stearic acid, oleic acidlinoleic acid, linolenic acid, arachidonic acid,content is2.98%,4.35%,13.16%,74.37%,3.19%,1.95%, respectively. Unsaturatedfatty acid content as high as90.72%. Lycium barbarum seed oil was studied on DPPHscavenging ability, IC50was21.7mg/mL, explained Lycium barbarum seed oil hasgood free radical scavenging effect.The production process and antioxidant activity of Lycium seed oil microcapsulewere studied. Production of Lycium barbarum seed oil by spray drying methodmicrocapsules, by single factor and orthogonal test to determined the best process.Primary and secondary effects of Lycium barbarum seed oil microencapsulated orderefficiency of various factors: the ratio of wall material compounding> ratio of corematerial and wall material> emulsion concentration, optimum conditions for the soyprotein isolate: maltodextrin is1:1, core material: wall material is1:2, theemulsion concentration was25%, under these conditions, the embedding rate is88.55%.Electron microscope scanning analysis was carried out on the microcapsule products,microcapsule particle size between20μm~30μm, appearance is close to the ball, most ofthe particle surface is smooth, no obvious sag, rupture. Using oven method fordetermined the resistance to storage of microcapsule products. The result showed thatmicrocapsule technology can greatly reduced the oixdation rate of seed oil products, at20℃can be stored for240days. |
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