The method of saccharifycation of purple sweet potato and simultaneous extracting purple pigment by α-amylase was developed in this work.The effect of α-amylase addition,enzymolysis temperature,enzymolysis time and solid-liquid ratio on the influence of extraction yield of pigment and saccharification were investigated.The results indicated that the optimal condition was enzyme addition 35 mg/g,enzymolysis temperature80 ℃,time 1.0 h,solid-liquid ratio 1∶5(g∶ml),extraction times 2,and the extraction yield of...