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Study on Extraction and Characteristics of Red Pigment from Rhododendron delavayi Franch

Chen Hai-xu

Abstract

A red pigment was extracted from Rhododendron delavayi Franch by resins method,and its characteristics were studied. The results showed that HPD-200 resin has the best performance of absorbing the red pigment. 75% Ethanol solution is optimal for desorbing the adsorbed pigment. After being used for 20 times repeatedly,the adsorption rate of HPD-200 resin is only at a loss of 1.4%. The pigment is stable to acidity,light,heating and common food additives. As a natural plant pigment from Rhododendron delavayi Franch,it has high value of development and utilization for the characteristics of low cost and easy availability,safety and reliability as well as convenience to use.

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Key concepts: Pigment, Chemistry, Adsorption, Extraction (chemistry), Botany, Chromatography, Organic chemistry, Biology