How to store food scientifically and keep it fresh?

In principle, all cultures can be preserved with porcelain bead culture preservation tubes. The principle of culture preservation is that spontaneous mutations during DNA replication lead to the degradation of bacteria, so it is necessary to create a state of inactive metabolism, a dry, low-temperature, hypoxic-deficient, and nutrient-deficient environment, and the closer to this state the environment created, the longer the strains will be preserved. However, it should be noted that due to the storage of special bacteria such as harsh bacteria (such as Haemophilus influenzae and Naphthella meningitidis), it needs to be stored at a temperature of -80 or lower to achieve a longer period of storage.

Food is stored properly.

In the hot summer, it is not only necessary to know how to eat food, but also to have a clear understanding of how to preserve food, and to ensure food safety while retaining the nutrition of food as much as possible. Because improper storage can lead to the growth of bacteria and the loss of nutrients in food, let's find out.

How to preserve the four types of food.

The way to preserve food is a green dish.

Usually, leafy greens are bought and dried to dry before being packed in a grocery bag and put in the refrigerator. It should be noted that the bag should not be completely sealed, and several ventilation holes can be pierced in the bag before storage to ensure good air permeability of green leafy vegetables.

Food preservation methods for leftovers.

Wrap the leftovers in a clean container (crisper or bag) and put them in the refrigerator after drying, and heat them up well the next time you take them out to eat. Uneaten fruits should be covered with clean plastic wrap and placed in the refrigerator, where a layer of surface is cut off.

Food preservation methods of eggs.

Generally, there will be two kinds of bulk eggs and boxed eggs on the market, most of the boxed eggs have gone through the process of cleaning, disinfection, film and other processes before leaving the factory, which can ensure the quality of eggs very well, and there is no need to clean them, and bulk eggs are generally not cleaned, and the surface dust should be gently wiped off with a clean cloth before being stored, and then put into an independent box in the refrigerator to avoid cross-infection.

Food preservation methods of meat.

Whether it is pork, beef, mutton or poultry aquatic products, they do not have the same protective mechanism as vegetables, and they are easy to cause bacterial growth regardless of whether they are raw or cooked. In particular, fresh meat contains a lot of bacteria, so it is more helpful to preserve it after heating.

The above is the specific food preservation method introduced to you, do you understand? Different foods should be stored in different ways, and we should also remind everyone that it is best to measure the temperature after the refrigerator has been used for a long time, and the general refrigerator should be kept at about 4, and the freezer should be kept at about minus 18.

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If you want to keep your food longer, you need to keep it in the freezer to keep it longer.

Tool raw materials. Knife ice cubes plastic wrap kitchen paper sealed bag.

Method: Read step by step.

Cut the meat into small pieces.

Put the cut meat in ice water and let it sit for 5 minutes.

After removing the meat, wrap it tightly in plastic wrap and freeze it in a sealed bag to keep it fresh for two to three weeks.

Dry the washed fish with kitchen paper.

Wrap the fish tightly in plastic wrap and refrigerate it in a sealed bag so that it stays fresh for two to three days.

A few tips for preserving food:

1. Hang up and preserve: such as onions and garlic can be placed in a mesh bag and stored in the air, which can prolong the storage time and avoid contact with too much water, the onion can be stored for more than 8 months, and the garlic can be stored until the spring of the next year.

2. Store in the dark: Potatoes are easy to sprout and turn green when they see light, so it is best to store them in the dark, put them in a carton, and be in a ventilated place.

4. Preserve in paper bags: Generally, fungi will rot after a long period of storage, so it is recommended to use dry and breathable paper bags for preservation.

5. Preservation after heating: Taking shrimp as an example, if it is directly frozen, during the freezing period, the shrimp shell will turn black due to oxidation, and it is best to freeze it in a sealed seal after heating, and it can be stored for up to half a year.

6. Use newspapers or cartons for preservation: If the Chinese cabbage may be too large to fit in the refrigerator, you can wet the carton or newspaper and put the vegetables vertically on it to prolong the shelf life of the cabbage.

1. The methods of food preservation generally include refrigerator preservation, plastic wrap, plastic bag, and fresh-keeping box.

2. Refrigerator freshness. Most Chinese's "food storage" method is to get everything done with a refrigerator, thinking that this way the food will not rot and spoil, absolutely safe. Actually, a refrigerator is definitely not a safe!

The nutritional value of food lies not only in its innate growth factors, but also in the acquired preservation environment. The refrigerator has a wide range of temperature control, which affects the adaptability of different foods to temperature, and it cannot guarantee that all foods are in the best state of freshness. For example, the optimal storage temperature for apples is 0-1 degrees Celsius, while for cucumbers is 7-8 degrees Celsius.

What's even more terrifying is that low temperatures don't kill bacteria, and the microorganisms in the refrigerator will become active once the temperature conditions are right, and unprocessed leftovers can cause food poisoning if they are contaminated with germs.

3. Plastic wrap and plastic bag. In order to overcome the frozen-freezer defects, people have begun to widely use plastic wrap and plastic bags to preserve food. After the packaging of plastic wrap and plastic bag, the evaporation of water in food is slowed down, and the freshness is stored in the refrigerator for several times longer than that of socks without treatment, and it can also solve the problem of cross-smell between foods to a certain extent.

However, the durability and sealing of plastic wrap and plastic bags are poor, and the food with good taste and strong food pollutes the environment in the refrigerator. Packaged food is piled up in the fridge and cluttered.

4. Fresh-keeping box. The fresh-keeping function of the fresh-keeping box is further than that of the plastic wrap and fresh-keeping bag, and the cross-flavor is basically solved. However, there are also problems with the design of the crisper box:

If the lid and the body of the box are close to each other, although the sealing performance is greatly enhanced, it is difficult to open and close, and it is not suitable for the elderly and children to make the tung coarse; However, if it is easy to open and close, this will greatly reduce the sealing performance of the crisper.

Here are a few ways on how to store your food properly and avoid food spoilage:

Temperature control: The temperature at which food is stored is very important, and different foods require different temperatures. In general, the refrigeration temperature is around 4 degrees Celsius and the freezing temperature is around -18 degrees. Choose the right temperature for different foods and storage methods.

Avoid cross-contamination: Avoid putting raw and cooked foods, meats and vegetables, etc., in the same container, which increases the risk of cross-contamination.

Separate storage: Storing large quantities of food in separate packages can reduce the exposure time of food after opening and reduce the chance of bacterial growth.

Keep it dry: Food needs to be kept dry because a humid environment helps bacteria grow and food spoils.

Seal when storing food: Food needs to be stored tightly to prevent bacteria and air from entering and maintain the freshness of the food.

Food classification filial piety storage: different kinds of food are stored separately to avoid cross-contamination of peculiar smells, such as meat, vegetables, fruits, etc. should be stored separately.

By storing food properly, you can maintain the freshness of your food, reduce waste, and keep it safe and healthy.