食品工艺学英文课件.ppt

Freezing;Freezing;Freezing Fresh Green Beans;Freezing Fresh Green Beans;Freezing Fresh Green Beans;Freezing Fresh Green Beans;Freezing Fresh Green Beans;Freezing Fresh Green Beans;Freeze Vegetables;Freeze Vegetables;Freeze Vegetables;Freeze Vegetables;Freezing Fruit;Instructions;4. Pre-treat fruits that tend to darken when cut, such as peaches and nectarines, using an ascorbic acid treatment. Find options near the your store’s canning section.;Freezing Fruit;Freezing Fruit——apple; Ascorbic acid solutions can also be used , but these tend to be expensive . A surface blanch , using steam or boiling water , can also be employed , thought it results in a softened slice , which may not be suited to some uses . The treated slices in a ratio of five parts fruit to one part dry -10℉. Some apples may be frozen using a dehydrofreezing process , where about 50% of the removed from the apple slices by standard drying equipment prior to freezing the slices. ;Freezing Fruit——Peach ;Freezing Fresh——Peach;Freezing;