Acidic Extraction and Refining of Red Pigment from Myrica rubra Pomace

doi:10.7506/spkx1002-6630-201224005

Abstract

Abstract:

An orthogonal array design was used to optimize conditions for the acidic extraction of red pigment from Myrica rubra pomace and optimum conditions for refi ning the crude pigment extract by ion exchange resin adsorption were studied.The optimum conditions for extracting red pigment from Myrica rubra pomace were found to be extraction at 60 ℃ for 4 h with acidic water at pH 1.5. D002 ion exchange resin showed the best refi ning effi ciency for the crude pigment extract among 5 types of ion exchange resin investigated. Static adsorption and desorption and dynamic adsorption experiments were carried out to determine the optimum refi ning conditions as follows: sample concentration adjustment to an absorbance value (at 509.5 nm) varying from 0.5 to 1, pH adjustment to a value between 2 and 3, adsorption at around 25 ℃ for 1.5 h,and sample loading at a fl ow rate of 3 BV/h.

Key words: Myrica rubra pomace, red pigment, ion exchange resin, extraction process, refining

CLC Number:

TS202.3

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