Vitamin C retention in orange juice, imitation orange juice, and orange beverage from frozen concentrates

Four brands of frozen concentrated orange juice or drink were analyzed for vitamin C content to determine if preparation methods and storage time of reconstituted beverages affected vitamin retention. Methods of preparation included electric blending or stirring; vitamin content was determined immediately upon reconstitution, and after 3 and 7 days of storage at 0 degrees C. Vitamin retention was not affected by preparation method, but was somewhat altered by time and product variation. Retention levels of all concentrates were 94% after 3 days and 91% after 7 days