Abstract: With Konjac as the research object,extraction and separation of the active components were studied by ultrasonic assisted co-production technology.The factors affecting the extraction of ceramide and alkaloids were investigated by orthogonal test,and the optimal extraction conditions were determined as follows:temperature 60 ℃,70% ethanol,time 20 min,solid/liquid ratio 1:40.After being separatedand purified,the ceramide was 1.57 mg/g with purity of 8077%;the alkaloid was 0.41 mg/g with purity of 71.68%;the extraction rate of KGM was 0.51 g/g by ethanol precipitation method,and the purity was 93.86%.In addition,the moisturizing property of extracted ceramide was investigated.The results showed that the moisturizing property of ceramide was better than these of olive oil and glycerol.In conclusion,the developed joint producing technology of active ingredients from Konjac provided reference for raising comprehensive use,decreasing production cost,increasing economical values and benefits.

Key words: Konjac, joint producing technology, ceramides, alkaloids, Konjacglucomannan