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張蓮熙,朴順姬,李英淑,朴相子 曉星女子大學家政學會 1971 효대가정학회지 : 효성여대 Vol.1 No.1
Haw much L-Ascorbic acid contained quantity in sweet Potato, be destroyed when we cook it especially, if we use the city-water for cookery. Haw much L-Ascorbic acid be destoyed by Fe ion which the city-water contain. We can see about it as a result of following experiment. First. when we use the city-water for cookery, as we, immediately, turn on the tap of the water-service which was rocket for a long time, there are much Fe ion in water, and as we use it for cooking sweet-potato, the L-Ascorbic acid destroyed in Sweet potato was very much. Second there are very few Fe ion in the water, if we turn on the tap and keep it on for 5 minites then we cook with it, we find there are very few L-Ascorbic acid destroyed. So we can see, when we cook, sweet potato, Fe ion contained in the water for cookery and the L-Ascorbic acid in sweet potato are in inverse proportion.