Because of this, most people are very worried that pesticides will remain on fruits and vegetables. How to clean them? Some people say to use salt and baking soda; Some people say that white vinegar is used, so which one is the best among many cleaning methods? Let's take a look.
A research team at Tufts University used a detailed national database, which contained more than 8,000 kinds of foods and beverages consumed by Americans. Fifty-four characteristics in nine fields (nutrition ratio, vitamins/minerals, protein, lipids, etc. ), the total score is * *1(the lowest health) to 100 (the highest).
But also according to nutritional characteristics related to obesity and diabetes, major cardiovascular and cardiovascular lifestyle-related diseases, and malnutrition risks (especially infants, mothers and the elderly). When I finally looked at all the food and drinks, I found three high-scoring food groups. The healthiest are vegetables (average score 69. 1), fruits (73.9) and beans/nuts/seeds (78.6). In particular, almost all raw fruits get 100 points. According to this score, it can be said that the healthiest foods are fruits and vegetables.
In the eyes of many people, fruits and vegetables contain residual pesticides, which can be removed by pouring white vinegar into water. In addition to cleaning with vinegar, there are also methods of cleaning fruits and vegetables with baking soda and salt solution circulating on the Internet. In fact, these are not suitable cleaning methods, because these compounds will increase the ionic strength of the solution and there are many kinds of pesticides. Sometimes these compounds will strengthen the adsorption of pesticides and make them difficult to be cleaned.
After all, pesticides are acidic, neutral and alkaline, vinegar is acidic and baking soda is alkaline. Neutral pesticides will not change their solubility because of adding acid or alkali, but if they are acidic pesticides, adding acid will make them insoluble, and vice versa. In other words, there are many kinds of pesticides, and different chemical structures may produce different metabolites due to different removal methods. On the other hand, because we don't know the types or properties of pesticides used in planting at that time, the cleaning methods we used can't be generalized.
In addition, the surfaces of fruits and vegetables are more or less natural waxy. These natural fruit waxes not only protect fruits and vegetables and reduce water evaporation, but also are one of the clues to observe whether pesticides are improperly applied. If the natural fruit wax on the surface of fruits and vegetables is deliberately removed, although the fruits and vegetables will be brighter, more nutrients may be removed at the same time, and the fruits and vegetables will not be able to withstand storage. In an experimental test, vinegar was added to one pot of water, then strawberries and apples were soaked, and pure vinegar was soaked in another pot of water. After 10 minute to 1 hour, no wax was dissolved by vinegar.
In fact, if you think about it carefully, you will understand that the wax on fruit is hydrophobic and belongs to lipid substances, and its solubility in water is very poor. Even if it is washed with water and vinegar, it is difficult to clean it. Generally speaking, the wax on fruits from regular sources is mostly edible wax, which will not cause harm to health, and we can also eat it with confidence. If you are really uneasy, you can choose to peel it.
As we all know, fruits and vegetables need to be washed before eating. But in real life, there are many ways to clean fruits and vegetables. When we use the wrong cleaning methods, fruits and vegetables are not only unhealthy, but also harmful to our health. So, how to wash to wash out healthy fruits and vegetables? Generally speaking, do 2 o'clock or better
1, rinse with running water.
According to Colorado State University's guidelines for handling fresh agricultural products, it is best to wash fruits and vegetables with water, and the best way is to use flowing water. Before eating fruits and vegetables, we can wash them with running water, peel the peelable fruits and clean the gaps with a soft brush. In addition, most detergents purchased in the market claim to remove pesticides, but in fact they are not better than tap water. Sometimes we worry about the secondary residue of surfactants in vegetable and fruit detergents. Therefore, it is suggested that when washing vegetables and fruits, you can rinse them with tap water for at least 30 seconds, combined with rubbing or rubbing.
2. Heat by blanching or cooking.
As we all know, there are many kinds of pesticides, which can be divided into contact-killing type and internal-sucking type according to the mode of application. Contact pesticides are sprayed on the surface of crops and can be easily washed off with clean water. It is generally recommended that you soak for one minute, and then rinse with water for two or three times. Systematic pesticides are scattered on the soil for plants to absorb. Because pesticides are not on the surface of crops, they cannot be removed by washing with clear water, but they can be removed by scalding or boiling.
# Family Health Guardian # # Health Science Competition #