以取自鱿鱼卵的富含多不饱和脂肪酸的磷脂酰胆碱为底物,在亚临界1,1,1,2-四氟乙烷(R134a)中通过磷脂酶 D 催化酰基转换反应制备了富含多不饱和脂肪酸的磷脂酰丝氨酸,并利用响应面法对影响磷脂酰丝氨酸合成的工艺条件进行了优化。结果表...以取自鱿鱼卵的富含多不饱和脂肪酸的磷脂酰胆碱为底物,在亚临界1,1,1,2-四氟乙烷(R134a)中通过磷脂酶 D 催化酰基转换反应制备了富含多不饱和脂肪酸的磷脂酰丝氨酸,并利用响应面法对影响磷脂酰丝氨酸合成的工艺条件进行了优化。结果表明,磷脂酶 D 在亚临界 R134a 中显示出高活性,可以高效地催化酰基转换反应制备富含多不饱和脂肪酸的磷脂酰丝氨酸,反应时间短,转化率高;反应时间、底物摩尔比、初始水分是影响转化率的显著因素。通过对转化率的拟合模型响应面分析,得到了优化工艺条件:在亚临界 R134a 体系中,体系压力6MPa,温度40℃,反应时间5.60h,酶量9.6U,鱿鱼卵磷脂75mg,L-丝氨酸1.02g,溶于2.30mL pH5.5磷酸盐缓冲液。在此优化工艺条件下,转化率的预测值为92.21%,实验值为89.06%,响应面模型的有效性得到了验证。展开更多
Euphausia pacific is an important source of natural astaxanthin. Studies were carried out to assess the extractability of astaxanthin from E. pacific using subcritical 1, 1, 1,2-tetrafluoroethane （R134a）. To examine...Euphausia pacific is an important source of natural astaxanthin. Studies were carried out to assess the extractability of astaxanthin from E. pacific using subcritical 1, 1, 1,2-tetrafluoroethane （R134a）. To examine the effects of multiple process variables on the extraction yield, astaxanthin was extracted under various conditions of pressure （30-150bar）, temperature （303-343 K）, time （10-50rain）, flow rate （2-10gmin-1）, moisture content （5.5%-63.61%）, and particle size （0.25-0.109mm）. The results showed that the extraction yield increased with temperature, pressure, time and flow rate, but decreased with moisture content and particle size. A maximum yield of 87.74% was obtained under conditions of 100bar, 333K, and 30min with a flow rate of 6gmin-1 and a moisture content of 5.5%. The substantial astaxanthin yield obtained under low-pressure conditions demonstrates that subcritical R134a is a good alternative to CO2 for extraction of astaxanthin from E. pacific.展开更多
文摘以取自鱿鱼卵的富含多不饱和脂肪酸的磷脂酰胆碱为底物,在亚临界1,1,1,2-四氟乙烷(R134a)中通过磷脂酶 D 催化酰基转换反应制备了富含多不饱和脂肪酸的磷脂酰丝氨酸,并利用响应面法对影响磷脂酰丝氨酸合成的工艺条件进行了优化。结果表明,磷脂酶 D 在亚临界 R134a 中显示出高活性,可以高效地催化酰基转换反应制备富含多不饱和脂肪酸的磷脂酰丝氨酸,反应时间短,转化率高;反应时间、底物摩尔比、初始水分是影响转化率的显著因素。通过对转化率的拟合模型响应面分析,得到了优化工艺条件:在亚临界 R134a 体系中,体系压力6MPa,温度40℃,反应时间5.60h,酶量9.6U,鱿鱼卵磷脂75mg,L-丝氨酸1.02g,溶于2.30mL pH5.5磷酸盐缓冲液。在此优化工艺条件下,转化率的预测值为92.21%,实验值为89.06%,响应面模型的有效性得到了验证。
基金supported by the National Natural Science Foundation of China (No.31071541)
文摘Euphausia pacific is an important source of natural astaxanthin. Studies were carried out to assess the extractability of astaxanthin from E. pacific using subcritical 1, 1, 1,2-tetrafluoroethane （R134a）. To examine the effects of multiple process variables on the extraction yield, astaxanthin was extracted under various conditions of pressure （30-150bar）, temperature （303-343 K）, time （10-50rain）, flow rate （2-10gmin-1）, moisture content （5.5%-63.61%）, and particle size （0.25-0.109mm）. The results showed that the extraction yield increased with temperature, pressure, time and flow rate, but decreased with moisture content and particle size. A maximum yield of 87.74% was obtained under conditions of 100bar, 333K, and 30min with a flow rate of 6gmin-1 and a moisture content of 5.5%. The substantial astaxanthin yield obtained under low-pressure conditions demonstrates that subcritical R134a is a good alternative to CO2 for extraction of astaxanthin from E. pacific.
