The research of the extraction and the stability of durian pericarp yellow pigment

The stability of the yellow pigment of Durian fruit peel was tested from an experiment which was processed by L9(33) orthogonal on the basis of single factors of cycle.From the result we have a knowledge of the best way to extract pigments,which was extracted by ethyl acetate when the Liquid Ratio is 1:30,the extraction temperature 50℃,the extraction time 4 hours.Stability research shows that:(I)The temperature,redox,metal irons and all kinds of food additives are of little effect on its stability,especially citric acid have graces role.However,Fe3+,Cu2+have greater influence on the yellow pigment than others.(II)Sunlight has a great effect on the pigment,so in the process of storage it should avoid direct sunlight.(III)pH value certainly affects the red pigment.In pH value at 12,the pigment changed its color obviously.