A comparative study between solvent and microwave assisted extraction technology of pigment from orange peel

In order to conform the extraction condition of pigment from orange peel, methods of pigment extracted from orange peel by solvent of ethyl ethanol and micro-wave assisted extraction were compared. In the method extracted by solvent of ethyl ethanol, the optimized conditions were: the concentration of ethanol was 95%; the ratio of raw material to solvent was 1:20 (g/ml); extraction time was 1.5 h; extraction temperature was 55 °C; extraction times was 3 times. In the method of micro-wave assisted extraction, the optimized conditions were: the concentration of ethanol was 95%; the ratio of raw material to solvent was 1:40 (g/ml); microwave irradiation time was 80s; extraction times were 3 times; microwave irradiation power was middle and high frequency.