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Study on extraction and characterization of red pigment from Oxalis vidacea L.

Xinlong Jiang

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Abstract

Physico-chemical properties and extractions of the red pigment in flowers of Oxalis vidacea L.were investigated.Results show that good yield of pigment could be obtained by 95% C2H5OH solution(with 10% HCl) of pH1 at 70℃ for 40min with the solid-liquid ratio 1∶30(g/mL).The Oxalis vidacea L.red pigment is classified to anthocyanins,for which pH had significant effect on the tone of pigment.The pigment is suitable to acid environment while its good heat resistance.Under sunlight,degradation of the pigment could be accelerated.Metallic ions Na+,Ca2+,Zn2+,A13+,Cu2+had no effect on the tone of pigment,but Fe3+,Pb2+ had severe disadvantageous effect.This kind of pigment possesses worse anti-oxidation ability.Addition of glucose,sucrose had no effect on the pigment.There was no unusual sign in the white mouse acute toxin experiment of the pigment.

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What this paper is about

Physico-chemical properties and extractions of the red pigment in flowers of Oxalis vidacea L.were investigated.Results show that good yield of pigment could be obtained by 95% C2H5OH solution(with 10% HCl) of pH1 at 70℃ for 40min with the solid-liquid ratio 1∶30(g/mL).The Oxalis vidacea L.red pigment is classified to anthocyanins,for which pH had significant effect on the tone of pigment.The pigment is suitable to acid environment while its good heat resistance.Under sunlight,degradation of the pigment could be accelerated.Metallic ions Na+,Ca2+,Zn2+,A13+,Cu2+had no effect on the tone of pigment,but Fe3+,Pb2+ had severe disadvantageous effect.This kind of pigment possesses worse anti-oxidation ability.Addition of glucose,sucrose had no effect on the pigment.There was no unusual sign in the white mouse acute toxin experiment of the pigment.

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Available abstract

Physico-chemical properties and extractions of the red pigment in flowers of Oxalis vidacea L.were investigated.Results show that good yield of pigment could be obtained by 95% C2H5OH solution(with 10% HCl) of pH1 at 70℃ for 40min with the solid-liquid ratio 1∶30(g/mL).The Oxalis vidacea L.red pigment is classified to anthocyanins,for which pH had significant effect on the tone of pigment.The pigment is suitable to acid environment while its good heat resistance.Under sunlight,degradation of the pigment could be accelerated.Metallic ions Na+,Ca2+,Zn2+,A13+,Cu2+had no effect on the tone of pigment,but Fe3+,Pb2+ had severe disadvantageous effect.This kind of pigment possesses worse anti-oxidation ability.Addition of glucose,sucrose had no effect on the pigment.There was no unusual sign in the white mouse acute toxin experiment of the pigment.

Key concepts: Pigment, Chemistry, Yield (engineering), Metal ions in aqueous solution, Sucrose, Metal, Nuclear chemistry, Botany

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