2014•Zhongguo tiaoweipinRequires access

Study on Extraction and Stability of Pigment from Peel of Pitaya

Sun Jun-ta

Abstract

The extraction and stability of pigment from the peel of pitaya are studied.The results indicate that the optimum extraction parameters are alcohol concentration of 70%,extraction time of50 min,the ratio of material to fluid of 1∶1.5,extraction temperature of 40℃.The pigment of pitaya is more stable at pH 5.0~6.0and 60℃.The stability of pigment gradually reduces in the dark,sunlight,blue-ray,ultraviolet light.Metal ions such as Na+,Ca2+,K+,Fe2+,Al 3+and Mg2+with0.01mol/L display little effect on the stability of pigment.Starch,sucrose and glucose additives can improve the stability of pigment.

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Key concepts: Pigment, Extraction (chemistry), Starch, Chemistry, Sucrose, Ultraviolet light, Metal ions in aqueous solution, Chromatography