野菜のカルシウム, 燐及び蓚酸の分布について
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概要
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1. Examination of the distribution of calcium and phosphorus in vegetables showed that total calcium is present in larger amount in the leaves than in the roots, especially in leaves of Japanese radish and carrots, whose roots are eaten. Total phosphorus was found to be approximately the same in all vegetables. 2. The calcium and phosphorus present in vegetables are in soluble and insoluble forms. The amount of soluble calcium against total calcium is about 40% in the roots and about 60% in the leaves, showing that there is more soluble calcium in the leaves. Soluble phosphorus is about 80% of total phosphorus content. 3. It is considered that insoluble calcium is present as a phosphate, carbonate, and oxalate, bound tightly in vegetable tissues, and is in a state not easily dissolved out. 4. Distribution of calcium in vegetables was found to be more concentrated in portions exposed to sunlight. 5. Molar concentration ratio of calcium and oxalic acid in the whole herb of spinach is 7.4 but the distribution differs markedly according to locations. It is 6 in leaves, 8 in the main leaf vein, and 12 in the stalk, while oxalic acid is small in the leaves. Even in a leaf, oxalic acid is present in comparatively larger amount in larger than smaller leaves. 6. When spinach is boiled from water, about 60% of oxalic acid dissolves out by boiling for about 5 minutes and the majority of insoluble oxalates, other than those remaining in spinach as insoluble calcium oxalate, dissolves out. This is advantageous in the absorption and utilization of calcium.
- 共立薬科大学の論文
- 1957-12-25
共立薬科大学 | 論文
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