Study on Extraction and Stability of Red Pigment from Bougainvillea glabra

Abstract

Abstract: Red pigment was extracted using Bougainvillea glabra Choisy bract as raw material.The optimum extracting conditions were selected by the orthogonal experiment,while the effects of light,temperature,pH value,oxide-reducing medium,6 kinds of metal ions and 4 kinds of food additives on the red pigment stability were studied respectively.The results showed that the pigment belongs to water-soluble anthocyanins,at the maximum absorption wavelength was 541nm,and the optimum extracting solvent was 5% ethanol,the sample weight to solvent volume 1:15 at 25℃ for 3 times,with an hour each time.It is stable below 70℃ and pH<7,but sensitive to light intensity and oxidant.Cu2+,Zn2+,Fe3+ evidently degrade the pigment,but Mn2+,Mg2+,Al3+,glucose,NaCl,VC and sodium benzoate have no harmful effect on it.

Key words: , Bougainvillea glabra Choisy； red pigment； thin-layer chromatography； extraction； stability；

LIU Jian-Xin, HU Hao-Bin, Zhao-Guo-Lin. Study on Extraction and Stability of Red Pigment from Bougainvillea glabra[J]. FOOD SCIENCE, 2006, 27(8): 98-102.

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Study on Extraction and Stability of Red Pigment from Bougainvillea glabra

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