【摘要】 富含(46%)花生四烯酸的微生物油脂会在低温(≤10℃)呈现凝固状态,为其使用带来诸多不便。本文以该微生物油脂为材料,采用表面活性剂法,优化了分提处理最佳工艺条件。另外,本文还对分提得到的液态油和固态脂的多项理化指标进行了评价,并采用气相色谱和质谱方法对液态油和固态脂的脂肪酸和甘油三酯的组成分别进行了测定。结果表明,采用本方法分提液态油得率为57.0%,熔点降到9℃,碘值增加,黏度降低,而且其花生四烯酸含量有所提高,其甘油三酯的类型主要为三不饱和型甘油三酯;而固态脂的熔点升至27℃,碘值降低,黏度增加,花生四烯酸的含量稍有降低,且甘油三酯的主要类型为二不饱和型甘油三酯。更多还原

【Abstract】 Solidification of microbial oil rich in 46% arachidonic acid at low temperatures(≤10℃) makes it difficult to use.In this paper,the microbial oil was used as the experimental material to optimize the best conditions of surfactant fractionation process.In addition,a number of physiochemical indexes about liquid and solid fat obtained by fractionation process were evaluated,and their compositions of fatty acid and triglycerols were also analyzed by gas chromatography and mass spectrometry.The result shows that the yield of liquid oil was 57.0%,the melting point drops to 9℃,the iodine value increased,the viscosity decreased,the content of arachidonic acid increased and its main type of triglycerols was tri-unsaturated triglycerol.The melting point of solid fat increased to 27℃,the main type of triglycerols was di-unsaturated triglycerol.Other indexes all display opposite trends compared to liquid oil.更多还原