In order to investigate the effects of ultra high pressure(UHP) on the content of soluble protein,peroxidase(POD) and pectinmethylesterase(PME) in litchi fruit,the pulp of litchi(Litchi chinensis Sonn cv.Huaizhi) was subjected to UHP treatment(100~400MPa for 30min at 10℃).The activities of POD and PME were detected by spectrophotometry,the isoenzymes of POD and PME were detected by native-PAGE and active staining.The content of soluble protein was detected by SDS-PAGE. Results showed that the POD activit...