Study on extraction and stability of pigment from Fujiminori grape
This dissertation utilized fresh Fujiminori grape peel as materials,discussed extraction conditions,and gained the optimum conditions of extracting pigment from Fujiminori grape through orthogonal experiment.The optimal extraction condition for Fujiminori grape pigment were as follows,80% of the ethanol as extraction agent,pH2,extracting temperature 70 ℃,the ratio of grape skin(g) and reagent(mL) 1∶7.At the same time,the stability of pigment from Fujiminori grape were researched.The pigment remained stable and tolerate high temperature and heating at pH2～6.The metal ions had some effect on stability of pigment.The chroma of pigment was greatly reduced by Cu2+,Fe3+,Fe2+,while Mg2+ can protect it.The oxidant H2O2 and reducer Na2SO3 showed marked degradation effect on the pigment.