How to remove these dishes oxalic acid?

　  Oxalic acid is an organic compound with the formula H2C2O4.it's CAS Registry Number is 6153-56-6,It is a colorless crystalline solid that dissolves in water to give colorless solutions. It is classified as a dicarboxylic acid. In terms of acid strength, it is much stronger than acetic acid. Oxalic acid is a reducing agent and its conjugate base, known as oxalate (C2O42−), is a chelating agent for metal cations. Typically, oxalic acid occurs as the dihydrate with the formula H2C2O4·2H2O. Oral consumption of oxalic acid or prolonged skin contact is dangerous.

oxalic acid,6153-56-6

    Oxalic acid is a special foods naturally occurring compound. Eating too much food with high oxalic acid content will cause any negative impact, because this substance may be chemically bound food magnesium and calcium and minerals.
　　Most people know that spinach contains oxalic acid, harmful, should be boiled in boiling water and then cook food.
　　In fact, many vegetables contain oxalic acid. Oxalate-rich foods, including beans, beets, celery, chocolate, grapes, green peppers, parsley, spinach, strawberries and tea. However, the scientific method can be removed or reduced.
　　Oxalic acid in human gastric juice, due to the strong acidic environment, so in order to form molecules, the molecular form of oxalic acid on the human body will have a stimulating effect on the stomach, so eat a lot of fried spinach, some people will be uncomfortable stomach. Therefore, a better approach is the spinach and tofu with fried tofu such as oxalic acid and calcium to form calcium oxalate precipitate containing this precipitate solubility in gastric juice is not high, so there will not be any harm to the human body.
　　While other equally contain oxalic acid foods such as wild rice, bamboo shoots, peas dish, but a lack of understanding.
　　In fact, regardless of spinach or other foods containing oxalic acid, all with an astringent taste, and food can be combined into a difficult to dissolve calcium oxalate, affect the body's absorption of calcium.
　　If long-term consumption of foods containing oxalic acid, can produce kidney stones. Therefore, the consumption of such foods should be like, like boiled spinach, first in boiling water for a few minutes, most of the oxalic acid will dissolve in water, remove and re-cook food, can remove astringency, but also greatly reduce the bad effects of oxalic acid loss of nutrients is not too large.