Study on the optimal extraction condition and the stability of the pigment from blood orange peel

Immersed extraction is used to extract the pigment from fresh ripe blood orange peel by.The experiments on extraction agents,extracting time,the liquid-solid ratio and extracting temperature show how to determine the optimal extraction process.That is,choosing ethanol as extraction reagent,with its ratio of liquid to solid being 1:70,with 5 hours of extraction,and the temperature of extraction: 60℃.The thermal stability of the blood orange pigment is good;in strong acid and alkaline solutions,the stability is reduced,while in neutral and weakly acid and alkaline solutions,the stability is good.Most metal ions,such as Na+,Mg2+,Ca2+,cannot affect the stability strongly.While Zn2+ and Cu2+ can deepen the color of this pigment.Oxidizing substances can make the color of the pigment fade,and affect its stability,while the pigment is not reacted with reducing substances.