Optimization of Microwave Extraction for Procyanidins from Raspberry Seeds

Objective:To explore the microwave-assisted extraction of procyanidins from raspberry seeds and screen the optimal extraction parameters.Methods:The response surface design was used to investigate the effects of ethanol concentration,microwave power,material-liquid ratio and microwave time on extraction rate of procyanidins from raspberry seeds.Results:The optimal extraction conditions were ethanol concentration of 60%,ultrasonic power of 300 W,material/liquid ratio of 1:10(g/mL) and microwave extraction time of 3 min.Under the optimal extraction conditions,the extraction rate of procyanidins from raspberry seeds was up to 7.19 mg/g,which exhibited a 3-fold enhancement compared with traditional water extraction.Conclusion:The optimized microwave extraction process for procyanidins from raspberry seeds is highly efficient and less time consumption.