Abstract: The supercritical CO₂ extraction of polyphenol from jackfruit seed was optimized by single-factor and orthogonal experiment.Experimental results showed that the successive order of different effect factors on yield of polyphenol was flow rate of CO₂>extracting temperature >ethanol concentration >ethanol dosage > extracting pressure.The optimal exterimental parameters were 30 g·min^-1 flow rate of CO₂,175 bar extracting pressure、70% ethanol concentration、5 mL/g ethanol dosage、50 ℃ extracting temperature、30 g/min flow rate of CO₂ and 1.5 h extracting time.The optimum technology of supercritical CO₂ extraction of polyphenol from jackfruit seed was high efficient,yield 0.6254 mg/g。

Key words: supercritical CO₂ extraction, jackfruit seed, polyphenol, ethanol