【摘要】 研究了在超临界二氧化碳 ( SC- CO2 )脱除蛋黄粉中胆固醇时 ,萃取温度 ( 33℃和 45℃ )和萃取压力 ( 2 0 MPa,2 5MPa和 30 MPa)对蛋黄粉成分和微观结构的影响 ,并对不同萃取温度和压力条件下 SC- CO2 对蛋黄粉中脂类、胆固醇和磷脂溶解的选择性进行了探讨 ,结果表明 ,蛋黄粉中的胆固醇与磷脂在 SC- CO2 中的溶解性规律大体呈相反趋势。对 SC- CO2 处理的蛋黄粉扫描电镜结果表明 ,SC- CO2 具有较强的渗透性和溶解能力 ,可将蛋黄粉颗粒内部的脂类选择性地溶解 ,这样导致蛋黄粉颗粒的破裂 ,其破裂程度与 SC- CO2 的密度和溶解能力有关。更多还原

【Abstract】 Removal of cholesterol from egg yolk powder was investigated using supercritical carbon dioxide (SC CO 2) at different combinations of pressure and temperature. Three different pressures (20MPa,25MPa and 30MPa)were used at 33℃or 45℃.The optimum conditions are 33℃/25MPa or 30MPa and 45℃/25MPa. Under these conditions more cholesterol could be removed while phospholipids could be concentrated. The selective solubility for lipids, cholesterol and phospholipids in egg yolk powder at different combinations of SC CO 2 pressure and temperature were investigated.The results showed that the solubility of cholesterol in SC CO 2 was contrary to that of phospholipids. The effects of SC CO 2 pressure and temperature on microstructure of egg yolk powder were investigated by scanning electron microscopy.The results showed that grains of egg yolk powder could be destroyed by SC CO 2.SC CO 2 with high density could permeate these grains and encapsulated lipids could be selectively dissolved .The destruction might be related to the density or the solvent power of SC CO 2 .更多还原