Should the vegetables and fruits you buy back be soaked in salt water?

1. Tap water: You don't have to soak it for a long time, 10 minutes is appropriate.

Zhu Yi, an associate professor at the College of Food Science and Nutritional Engineering of China Agricultural University, said that soaking or washing with tap water can remove some pesticide residues, but it does not have to be soaked for a long time, and 10 minutes is appropriate.

If you soak for too long, you may cause nitrate.

There are also physical and mental health hazards. Food poisoning in vegetables and fruits caused by pesticide residues of methyl parathion.

The proportion of incidents is very high, including the commonly used insecticidal doubles, and when cleaning up such pesticide residues, the actual cleaning effect of warm boiled water is stronger than that of cold water.

2. Salt water: It is easy to let nutrients flow out, which is beneficial to remove small insects.

He Jiguo, an associate professor at the College of Food Science and Nutritional Engineering at China Agricultural University, said that soaking fruits and vegetables in salt water is not very usable, especially for green vegetables, which can destroy the cytoplasm of green leaves.

Not only does it damage the nutrients, but it also has a high risk of pesticide residues entering the dish. Ma Zhiying, head of the expert committee of the Shanghai Food Association, stressed that salt water is not very effective in cleaning up pesticide residues, but it can help remove pests and diseases in fruits and vegetables, such as salt water can be soaked into large cherries, cauliflower and other fruits and vegetables Some small insects.

3. Add water to the water.

Alkali (soda. : If the concentration value is not well controlled, it is the same as tap water.

Zhu Yi emphasized that for commonly used pesticide residues, the effect of soda foaming is likely to be better. Soda and other edible bases.

It has a certain practical effect on the removal of methyl parathion pesticide residues, and the addition of 10% edible alkali in cold water has the best practical effect, and the sludge load of insecticide can be achieved. As everyone knows, the actual effect of edible alkali concentration value less than 2% or more than 15% is the same as that of tap water. Therefore, use alkaline water.

To clean fruits and vegetables, it is necessary to grasp the concentration value.

4. Rice water.

There is help, but you have to make sure that you have no residue.

The rice washing water that everyone commonly uses in daily life is actually weak alkaline water, which helps to clean up pesticide residues. However, some rice itself will have pesticide residues, and there may be uncertainties and risks in the rice washing water.

5. Detergent: If it is not advocated, it is likely to lead to secondary pollution.

You can't soak it, but if there's any residue, can it get to you? Who is responsible for eating problems, so these soaking in salt water and soaking with soda are the marketing strategies of salt and soda manufacturers. It's because I usually eat too little salt and soda, so soaking in water is different.

A bag of salt ran out after a few runs.

I think it should be soaked in salt water because it has a bactericidal effect and it also helps our health, so I think it should be soaked in salt water.

Vegetables and fruits should be soaked in salt water to better remove pesticide residues on vegetables and fruits.

I think the vegetables and fruits I bought should be soaked in salt water to destroy bacteria and wash them more cleanly.

The vegetables you just bought need to be soaked in water, because the vegetables you just bought are very dirty, it may be that they have just been picked in the field, and there is not only dust on the leaves, but also residual pesticides, or animal feces, in short, they are very dirty, so be sure to wash them thoroughly.

Freshly bought vegetables need to be cleaned by hand, remove the yellow leaves and rotten leaves on the vegetables, and then remove the roots, leaving clean, fresh leaves. At this time, soak the leaves in a basin of water, soak for about ten minutes, and if you feel that it is not clean, you can buy some healthy dish soap and other things to clean the dirt on the leaves. This will be more reassuring.

If you want to eat vegetables, it is better to make them at home, because some vegetables are difficult to clean, and many restaurants will not wash them carefully in order to save time, and it is likely that they will eat bacteria in their mouths, and there may be some parasites. Therefore, if you want to eat with confidence, it is better to do it at home, and the processing process is clear to yourself, so as not to harm your health.

There are some vegetables that cannot be soaked for a long time, such as enoki mushrooms, mushrooms, etc. This kind of vegetable can be cleaned, very vegetables after soaking in water, but also rinsed with running water, must use running water, only flowing water, will rinse the dirty things on the leaves.

Eating more vegetables is very good for the body, it can supplement our dietary fiber, supplement the vitamins that our body lacks, eat vitamins will improve resistance, and colds and fevers will not find you! Therefore, we must have a balanced daily diet, preferably eat more vegetables, less meat, and consume enough protein.

The practice of green vegetables is also very simple, generally there is a cold salad and fried way to eat, vegetables must be blanched with water, wait for the vegetables to break off, and then mix with seasonings It is already very delicious! Usually, you should eat more like this, which is very beneficial.

Vegetables are generally soaked in water for 30 minutes, and then slightly scrubbed can play a good role in removing pesticide residues. If you use a special fruit and vegetable detergent, the soaking time can be controlled to about 20 minutes, and the final warm water rinse can also play a role in removing pesticide residues.

Soak fresh fruits and vegetables in detergent for 10-15 minutes, or tap water for 30 minutes, and rinse with water. If the skin needs to be peeled, direct peeling can effectively remove more pesticide residues.

Soak the vegetables in tap water for 10-60 minutes and then scrub them slightly to remove 15-60 pesticide residues. And the longer the soaking time, the less pesticide residue there will be.

The vegetables you just bought should be soaked in water and sprinkled with a little salt, because the vegetables are sprayed more frequently, and there are more pesticide residues.

It is best to soak the vegetables you just bought with water or light salt water, so that you can soak the pesticides on the vegetables or soak out the insects.

Many people are worried about pesticide residues in fruits and vegetables bought in the market, so they soak them before eating.

People always like to add a little salt when rinsing vegetables and fruits, thinking that salt can kill bacteria, and naturally can also remove pesticides left on the skin. Does this actually work?

Salt is the king of all flavors and is one of the most commonly used condiments by people. If you don't add salt to your cooking or coleslaw, you're in for a treat. In addition to seasoning, salt also has an insecticidal effect, killing mollusks (insects) with mucus such as slugs, snails, and leeches.

However, Tadpole Jun wants to tell you that there is no scientific basis for the claim that "salt water can effectively remove pesticides". Because the chemical composition of salt is relatively stable and does not easily react with other chemical components, even if a certain amount of salt is added to the water to soak fruits and vegetables, the actual effect is mainly water.

Therefore, the truth is that repeated rinsing with water can effectively remove pesticide residues from vegetables. There are many experiments on the Internet about salt water, washing salt water, baking soda water, flour water and rice washing water, etc., and the more people look at it, the more dizzy they become. However, the fact is that these methods have their own characteristics in removing pesticide residues, and the experimental environment is affected by various factors such as temperature, humidity and instruments, so it cannot be generalized.

There are many experiments on the Internet about various ways to remove pesticide residues.

The experimental equipment and environment are also different.

In fact, if you want to clean pesticide residues on the surface of fruits and vegetables, the easiest way is as follows:

1. Alkaline water

Most pesticides are acidic, and soaking them in alkaline water can neutralize the reaction, and the effect of removing pesticide residues in vegetables is better. Therefore, one of the easiest ways to clean pesticide residues in fruits and vegetables is to use edible alkali. The specific method is to add a pinch of alkaline noodles to the clean water, soak the vegetables for about 5 10 minutes after it is dissolved, and then rinse it with water to process or eat it directly.

2. Rice washing water

At present, most of the vegetable farmers and fruit farmers use organophosphorus pesticides and chloroformate pesticides, which are commonly used pesticides when they encounter alkaline solutions, and generally lose most of their toxicity quickly, while the rice water is weakly alkaline and can play a detoxifying role. If the uncut vegetables, melons and fruits are soaked in rice washing water for a few minutes, and then rinsed with water, most of the pesticide residues on the surface of vegetables and melons and fruits can be removed or rejected.

Rice washing water can not only decontaminate and disinfect, but also save water.

3. Clear water

In fact, there are strict national standards for pesticide residues on the surface of fruits and vegetables, so the fruits and vegetables that are normally sold can be eaten as long as they are carefully cleaned with water, and there is no need to be too nervous.

Tadpole-kun thinks that the most important thing is to eat fruits happily!

(We would like to thank the Beijing Food Society for their help with this article.) If you have any questions or rumors about food health that need to be answered, please be sure to tell Tadpole, and Tadpole will invite authoritative experts to solve your doubts scientifically as soon as possible. ）

How to reduce pesticide residues in vegetables, vegetables contaminated by pesticides or pesticide residues exceeding the national standards shall not be marketed and shall not be eaten. How to reduce pesticide residues in vegetables? Although in the past two years due to food safety has received widespread attention, such as the prohibition of the use of highly toxic pesticides, pollution-free vegetable area is expanding, but there is a gap in the understanding of some areas, the development is unbalanced, coupled with the complexity and uncommon detection of pesticide residues, some pesticides exceed the standard vegetables are also mixed into the market, and the general consumers do not know, so some simple methods are proposed to reduce the pesticide residue pollution of vegetables on the market after harvesting is effective.

Pesticide residues in vegetables.

Methods for reducing pesticide residues in vegetables:

a) Immersion method.

Rinse the purchased vegetables with water 2-3 times and soak them in clean water for 1-2 hours to remove pesticides from the remaining surface. You can also add a small amount of dish soap to water and soak it for 10 minutes, which can transfer most of the pesticides on the surface to the dish soap solution. After soaking, rinse with water 2-3 times.

2) Alkaline water immersion.

Many organophosphorus pesticides decompose easily in alkaline environments. The method is to put a small spoon of baking soda in the water, then put the vegetables and fruits into the soak for 15 minutes, remove them and wash them with water.

c) Peeling method.

Some organophosphorus, organomercury and pyrethroid pesticides have low solubility in water, but are easily soluble in organic solvents or waxy solvents, while melons and fruits vegetables have wax and are easy to absorb pesticides, so they should be peeled and eaten again.

4) Heating method.

With the increase of temperature, methyl aminoester pesticides can accelerate decomposition, and pesticides can be removed by heating method, by cleaning the surface of vegetables first and then blanching them in boiling water for 2-5 minutes, and removing more than 90% of the residual pesticides.

5) Acid immersion method.

Most pesticides and insecticides such as methamidophos, dimethoate, etc., will lose their toxicity when exposed to acid, you can wash the vegetables first and then put a small amount of sour vinegar in the water, soak the vegetables for 10 minutes, remove and rinse, can reduce pesticide residues.

6) Pesticide residue detector.

CSY-N12 portable pesticide residue detector is an instrument specially designed according to the national standard method --- rapid test card method (paper method). It is mainly used for the rapid detection of organophosphorus and carbamate pesticides in fruits, vegetables, tea, grain, water and soil, especially for on-site law enforcement use of food safety testing institutions at all levels.

Some of them can be removed, but not all of them can be removed.

Brackish water immersion is one of the ways to remove pesticide residues. When the salt concentration of the cell fluid in plants such as vegetables and fruits is lower than the salt concentration in the soaked water, the cells will lose water, and the process of water loss will lose some of the water-soluble pesticides remaining in the plant cells and reduce the residues of some pesticides. Some studies have found that 5% salt solution has a good effect on removing pesticide residues of methyl parathion, malathion, methamidophos and oxymethoate.

Soaking in an acid or alkaline solution can also help remove pesticide residues. For example, vitamin C, citric acid solution, etc. will remove pesticide residues such as profenofos, lindane, and DDT on potatoes; Sodium carbonate alkaline solution can remove residual organophosphorus pesticides.

Introduction:

Washing rice and washing vegetables and fruits is also one of the methods that can be used in daily life. Soak fruits and vegetables in rice washing water for a few minutes, and then wash them with water to reduce pesticide residues to varying degrees.

Boiling water heating can also remove some pesticides, such as celery, spinach, cauliflower, beans and other vegetables can be treated with boiling water before cleaning, and then soaked in clean water for cleaning, the pesticide removal rate can be as high as 90%. Do not treat boiling water for too long to reduce the loss of nutrients.

Incorrect, salt water can make insect eggs, borers, etc. easier to fall, but salt will reduce the cleaning ability of water, and if the concentration of salt is too high, it will form osmotic pressure, so that pesticides in the water will enter the vegetables and fruits, which is counterproductive.

Wash vegetables properly:

1. For cucumbers, green peppers, carrots, bitter gourds and other stems and melon vegetables, you can put on the washing spirit and soak it in warm water for 1-2 minutes, and then scrub it with a soft brush, especially the depression, brush it a few times, and then rinse it with water, and if necessary, you can also peel and wash it.

2. For Chinese cabbage, cabbage and other leafy vegetables, the peripheral leaves can be removed, and the inner leaves can be soaked in warm water and then rinsed with running water one by one.

3. For spinach, chrysanthemum, chicken hair, cabbage and other green vegetables with small leaves, the roots can be cut off, put in water and shake to clean, and then the roots are rinsed in front of the faucet, and the residual pesticides are removed through the impact and vibration of the water.