The optimization of extraction technology of procyanidins from apple pericarp by orthogonal experiment

The extraction technology of procyanidins from the apple pericarp was optimized.Based on single factor test,the effect of ethanol concentration,extraction time,extraction temperature,solid/liquid ratio(g/mL)on the extraction rate of procyanidins was studied according to L9(34)orthogonal test.The results showed that the order of the factors influencing the extraction by the water bath method were:ethanol concentrationsolid/liquid ratio(g/mL)extraction timeextraction temperature.The optimum extracting conditions of procyanidins from the apple pericarp by orthogonal test were:adding 10%(v/v)of 60% alcohol and extracting for 120 minutes at 65℃.The extraction of procyanidins was 2.82mg/g under the above conditions.