Study On Extraction And Purification Of Lonicera Edulis Red And Stability Of The Pigment

This paper mainly dealt with the extraction and purification conditions of bluehoneysuckle red and stability of the colorant. The study laid theoretical foundation for large-scale extraction and purification of bluehoneysuckle red.Through experiments, the optimum extraction conditions of ethanol extraction and microwave extraction were obtained. The optimum conditions of ethanol extraction were ethanol/water (6:4) extraction time 2h at 30 , bluehoneysuckle fruit:solvent=1:10. As a result, the yield of the extracted pigment achieved 95.1%. The optimum conditions of microwave extraction were ethanol/water (5:5) , extraction time 40s,extraction power at low. As a result, the yield of the extracted pigment achieved 93.8%.The optimum purification's conditions of bluehoneysuckle red by macroporous resin adsorption were studied. While ImL/min ~2mL/min as the flow rate on adsorption, 2mL/min as the flow rate on desorption, adsorption and desorption at normal temperature.absorbency of adsorption liquid at 0.55*50~0.85*50.The purificated pigment colourity enhanced 11 times.The stability of bluehoneysuckle red has obviously enhanced after purification.It is sensitive to light, heat, oxidant and Vc.This paper has proved that the pigment maintain stable under protection of Mg+, glucose and edible acid.Meanwhile, the pigment showed preserve-stability and high-colored capacity in beverage, frozen foods and flour products.