Abstract:Using Qinghai plateau Chenopodium quinoa as raw material and alkaline protease as enzymatic agent to study the extraction process of Chenopodium quinoa starch.On the basis of single factor experiment，the extraction rate of Chenopodium quinoa starch was used as the evaluation index，and the response surface method was used to optimize the process conditions for extracting Chenopodium quinoa starch.The results indicated that the optimal conditions were enzyme dose added at 0.598 %，under the condition of pH 9.09，hydrolysis for 122 min and enzymatic hydrolysis temperature at 40.60 ℃.Under this condition，the predicted extraction rate of Chenopodium quinoa starch was 89.26%.Extraction of Chenopodium quinoa starch was under optimal processing conditions.The starch extraction rate was（89.09±0.15）%，and the protein residual rate was（1.02±0.46）%.The relative error between the predicted value and the measured value was 0.19%，which was close to the predicted value of the established model.It indicated that this model was feasible and scientific to optimize the extraction technology of Chenopodium quinoa starch.