Study on extraction and characterization of red pigment from Tulipa gesneriana

Physical-chemical properties and extractions of the red pigment in flowers of Tulipa gesneriana were investigated.Results showed that good yield of pigment could be obtained by 95% C_2H_5OH solution(with 10% HCl) of ph1 at 80℃ for 20min with the solid-liquid ratio 1∶30(g/mL).The Tulipa gesnerianared pigment is classified to anthocyanins,it can be dissolved in water and acidity ethanol,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~+,Ca~(2+),Zn~(2+),Al~(3+),Cu~(2+) had no effect on the tone of pigment,but Fe~(3+),Pb~(2+)had severe disadvantageous effect.This kind of pigment possesses better oxidation ability.This kind of pigment has better endurance capability against oxidizing agent,but it has less resistance capability against reducing agent.Addition of glucose,sucrose had no effect on the pigment.