Using orange peel as raw material,the pectin was extracted by ultrasonic assisted ammonium oxalate method,and the effects of ammonium oxalate concentration,liquid-solid ra-tio,ultrasonic time,and extraction temperature on pectin extraction rate were studied by single factor and orthogonal experiment.The results showed that the optimal extraction conditions were as follows:ammonium oxalate concentration 0.75％,solid-liquid ratio 1∶21(g/mL),ultra-sonic treatment time 50 min,extraction temperature 85℃.Under these conditions,the extrac-tion yield of pectin reached 21.42％.This study provided theoretical basis for the industrial pro-duction of orange peel pectin extraction.
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