Extraction Craft and Properties of Yellow Pigment from Marigold

The extraction craft and stability of marigold pigment are investigated in this paper.The pigment is extracted with ethyl acetate,petroleum ether,acetic acid,ethanol,separately,and their strongest absorption wavelength are detected by ultraviolet scanning in order to choose the optimum extract solvent.The optimum craft conditions are determined by both single-factor and orthogonal experiment.The results indicate that the pigment has the strongest absorption peak at 447 nm.The optimum extraction condition is the petroleum ether with the material fluid ratio of 1∶8,and extraction time of 60 min under 30 ℃.The pigment has a bad thermostability,the degeneration rate under the lights is faster than in dark,the concentration of the sucrose,salt and preservatives have little influence on the pigment,K +,Na +,Ca 2+ and Al 3+ have a little influence on the pigment,but Fe 2+,Cu 2+ and Fe 3+ can reduce stability of the pigment,thus,iron,copper vessels should not be used during the utilization and processing of this pigment.