Optimization of Extraction Process and Stability Study of Black Rice Pigment

The technological procedure of extracting pigment from edible black rice was studied.This study choose alcohol as the extract agent.Using orthogonal experimental method,it proved that the optimum extracting condition was:solid to water ratio 1∶50,alcohol percent 95%,pH 1.8,temperature 60 ℃,extraction time 90 min.At the same time,the acid-resistant,oxidation resistant,light-fastness,heat resistance of the pigment was discussed.It proved that black rice pigment is not very stable and vulnerable to light,temperature,pH,oxidant effects of factors such as fading or discoloration occurred.