为探索消除菜籽蛋白中酚污染的技术途径,采用菜籽蛋白沉淀率和菜籽蛋白-酚分配系数为指标,考察了菜籽蛋白与酚共存体系的固-液相平衡关系,并基于相行为特征提出了菜籽蛋白提取工艺的改进措施。结果表明:在碱性环境下,酚酸和单宁均可与...为探索消除菜籽蛋白中酚污染的技术途径,采用菜籽蛋白沉淀率和菜籽蛋白-酚分配系数为指标,考察了菜籽蛋白与酚共存体系的固-液相平衡关系,并基于相行为特征提出了菜籽蛋白提取工艺的改进措施。结果表明:在碱性环境下,酚酸和单宁均可与菜籽蛋白发生共沉淀作用,且浓度越高该作用越显著;在p H 4环境下,菜籽蛋白不仅溶解度最低,而且与单宁或菜籽多酚的结合作用最弱;而在溶液中添加1%的Na Cl有利于进一步提升菜籽蛋白和酚的分离效果。在菜籽蛋白的富集或提取工艺中,溶剂用量(液固比)、p H以及盐添加量都可对菜籽蛋白和酚的相互作用产生影响,对这些参数的优化将有利于提高菜籽蛋白提取的选择性并降低酚的混杂。展开更多
The solid-liquid equilibrium data for a ternary system of 4-hydroxybenzaldehyde (3) + 3-bromo-4-hydroxybenzaldehyde (2) + 3,5-dibromo-4-hydroxybenzaldehyde (1) were determined with differential scanning calorimetry (D...The solid-liquid equilibrium data for a ternary system of 4-hydroxybenzaldehyde (3) + 3-bromo-4-hydroxybenzaldehyde (2) + 3,5-dibromo-4-hydroxybenzaldehyde (1) were determined with differential scanning calorimetry (DSC).The data were obtained through the method of determining the solid-liquid equilibrium data for the pseudo-binary solution.The solid-liquid equilibrium data of the ternary system showed that the mixture was a eutectic system with mole fractions xl=0.2445,x2=0.3883,x3 =0.3672,and Teu=338.5 K.The corresponding eutectic type phase diagram was also presented.The data were correlated by the Ott’s equation.With interaction parameters from binary systems,the Wilson equation was extended to correlate the solid-liquid equilibrium data of the ternary system and the root mean square deviation of temperature was only 0.97 K.It demonstrates that the Wilson equation predicts the solid-liquid equilibrium for the ternary system with fair accuracy.展开更多
文摘为探索消除菜籽蛋白中酚污染的技术途径,采用菜籽蛋白沉淀率和菜籽蛋白-酚分配系数为指标,考察了菜籽蛋白与酚共存体系的固-液相平衡关系,并基于相行为特征提出了菜籽蛋白提取工艺的改进措施。结果表明:在碱性环境下,酚酸和单宁均可与菜籽蛋白发生共沉淀作用,且浓度越高该作用越显著;在p H 4环境下,菜籽蛋白不仅溶解度最低,而且与单宁或菜籽多酚的结合作用最弱;而在溶液中添加1%的Na Cl有利于进一步提升菜籽蛋白和酚的分离效果。在菜籽蛋白的富集或提取工艺中,溶剂用量(液固比)、p H以及盐添加量都可对菜籽蛋白和酚的相互作用产生影响,对这些参数的优化将有利于提高菜籽蛋白提取的选择性并降低酚的混杂。
文摘The solid-liquid equilibrium data for a ternary system of 4-hydroxybenzaldehyde (3) + 3-bromo-4-hydroxybenzaldehyde (2) + 3,5-dibromo-4-hydroxybenzaldehyde (1) were determined with differential scanning calorimetry (DSC).The data were obtained through the method of determining the solid-liquid equilibrium data for the pseudo-binary solution.The solid-liquid equilibrium data of the ternary system showed that the mixture was a eutectic system with mole fractions xl=0.2445,x2=0.3883,x3 =0.3672,and Teu=338.5 K.The corresponding eutectic type phase diagram was also presented.The data were correlated by the Ott’s equation.With interaction parameters from binary systems,the Wilson equation was extended to correlate the solid-liquid equilibrium data of the ternary system and the root mean square deviation of temperature was only 0.97 K.It demonstrates that the Wilson equation predicts the solid-liquid equilibrium for the ternary system with fair accuracy.
