Abstract
The quantitative changes of vitamin C, acids and reducing sugars in juices of citrus Unshyu, lemon, grape-fruits, summer orange, strawberry, loquat, peach, grape, prince melon, pineapple, apple and plum during storage at 5°C for 3 weeks were investigated.
More than 40% of vitamin C in fresh juices were still remained in juices of citrus and prince melon after 3 week-storage, but in juices of peach, grape, pineapple and plum, vitamin C decreased to 1020% of original contents.
The contents of reducing sugars in juices of loquat and apple did not change during 3 weekstorage. Those of prince melon and peach increased and those of other fruits showed tendency to decrease.
The contents of acids increased during 3 weekstorage in juices of citrus Unshyu, loquat, peach and prince melon. In other juices no significant changes in acids contents were found.
The increase of amino nitrogen in several kinds of juices in which soluble nitrogen decreased may suggest the production of free amino acids or peptides from protein.
