以碱解法制备水溶性红曲红色素。碱解过程可使红斑素和红曲红素分子中的内酯键打开 ,生成羧酸盐 ,提高其亲水性。当反应体系中 Na OH与红曲色素用量比例为1∶ 13时 ,碱解过程可在 15min内完成。在 p H 5～ 9范围内 ,生成的水溶性红色素...以碱解法制备水溶性红曲红色素。碱解过程可使红斑素和红曲红素分子中的内酯键打开 ,生成羧酸盐 ,提高其亲水性。当反应体系中 Na OH与红曲色素用量比例为1∶ 13时 ,碱解过程可在 15min内完成。在 p H 5～ 9范围内 ,生成的水溶性红色素的吸光值随 p H增大而略有提高。加热和光照都将影响其稳定性 ,绝氧则对提高其稳定性无明显影响。在中性条件下 ,Ca2 +和 Mg2 +导致色素溶液沉淀 ,Sn2 +、Al3+和 Fe3+则对其稳定性影响较小。展开更多
Factors influencing the stability of the red pigment extracting form Haihongguo fruit,a natural fruit,were investigated in this paper.The results showed that the pigment was stable in acid,under the light and heat con...Factors influencing the stability of the red pigment extracting form Haihongguo fruit,a natural fruit,were investigated in this paper.The results showed that the pigment was stable in acid,under the light and heat condition.The food additions such as starch,carbohydrate,ascorbie acid,sucrose,glucose sodium benzoate ect.,have no bad influence on the color quality of the pigment,so did the reace element for human body such as K+,Na+,Ca2+,Zn2+,ect.,However the Fe3+,Sn2+,H2O and Na2SO3,have redox reaction with the pigment and change its color.The exaction of red pigment in the Haihongguo Fruit may provide the new sources for the food addition.展开更多
文摘Factors influencing the stability of the red pigment extracting form Haihongguo fruit,a natural fruit,were investigated in this paper.The results showed that the pigment was stable in acid,under the light and heat condition.The food additions such as starch,carbohydrate,ascorbie acid,sucrose,glucose sodium benzoate ect.,have no bad influence on the color quality of the pigment,so did the reace element for human body such as K+,Na+,Ca2+,Zn2+,ect.,However the Fe3+,Sn2+,H2O and Na2SO3,have redox reaction with the pigment and change its color.The exaction of red pigment in the Haihongguo Fruit may provide the new sources for the food addition.
