| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sweet potato juice having high sugar content and good for health, etc., in high yield by heating a sweet potato having high carotene content under a specific condition to attain a prescribed maltose content and squeezing the heat-treated sweet potato. SOLUTION: A sweet potato having high carotene content and containing >=1mg% of β-carotene is heat-treated under a condition to essentially deactivate a polyphenol oxidase existing in the potato and activate amylase to attain a maltose content of 1-10wt.%, preferably 3-8wt.% and the treated potato is squeezed with a screw press or a twin screw rotary extruder to obtain the objective sweet potato juice. |
