Abstract:

Abstract:The effects of extraction pigment of red sorghum such as solvent species,chroma,acidity,temperature and extraction time was tested respectively.The best extraction condition of pigment of red sorghum was determined by using the orthogonal experiment(L934). Analysed to two kind of sorghum pigment solution ultraviolet-visible spectrum. The orthogonal experiment definite that the best extraction method of pigment of red sorghum were 80℃,75% (v/v)alcohol ,a 2.0 of pH value, the ratio of solid to liquid of 1﹕100(g/ml), extraction time of 2h. Pigment of red and purple black of sorghum solution biggest absorption peak is 494nm and 499nm respectively in the visible light area.Preliminary identification pigment of red sorghum includes the flavones and flavonols substance by analyzing the ultraviolet spectrograph data.