Microwave-assisted Extraction of Yellow Pigments from Mango Peel
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Abstract:
Effects of microwave power, irradiation time and the ratio of pulp to ethanol (95% (V/V)) on microwave assistant extraction of yellow pigments in mango peel were investigated, and the optimum conditions of aforementioned factors were optimized by using orthogonal experiment. The qualitative analysis of the crude pigments obtained was carried out by color reaction. The pigments were separated and structurally identified through HPLC. The category and content of the pigments were also determined. The results showed that microwave power, irradiation time and the ratio of pulp to ethanol [95% (V/V)] significantly affected the extraction of yellow pigments in mango peel. The extraction rate and yield could be up to 89.92% (m/m) and 5.1% (m/m) respectively when the mango peel were extracted three times in 6-times ethanol [95% (V/V)] at 640 W of microwave power for 30 s. The significance order of above three factors on the extraction was the ratio of mango peel to 95% (V/V) ethanol >microwave power > irradiation time. Determination of elementary structure of pigments showed that the pigments were of carotenoid compounds, and the main components were xanthophylls with hydroxy. The total content of those components was about 99.82% (m/m).
