Frozen food is divided into; Frozen food "refers to" frozen food ";. Food that freezes rapidly at temperatures below -30 ℃ is called frozen food, while food that freezes at temperatures below -18 ℃ is called frozen food Food at 23 ℃ is called frozen food& nbsp;
Nutritional components of frozen food
& nbsp; Fresh food undergoes rapid freezing processing, which can reduce the activity of water in the food matrix, inhibit the activity of microorganisms and many enzymes, slow down the speed of various chemical and biochemical reactions, and slow down the rate of food spoilage, thereby maximizing the preservation of the original freshness, color, flavor, and nutritional content of natural food. This is also the characteristic of frozen food.
How to thaw frozen food& nbsp;
The biggest problem with frozen food is thawing. If thawed improperly, not only will the taste deteriorate, but it will also lead to the loss of nutrients. During the freezing process of food, protein denaturation occurs due to cooling, local dehydration, and changes in pH value. Freezing can also affect the tenderness of beef& nbsp;& nbsp;
When thawing, one should take the following measures:; Slowly Thaw” Don't be impatient and put it directly on the stove to thaw. Thawing frozen food in water can cause loss of nutrients due to the loss of juice.
The various enzymes in frozen vegetables are not easily inactivated even at low temperatures, and after thawing, their activity increases with the rise of temperature, which can cause the food to change color and affect its quality.
The best thing is 0 ℃‐ Completely thaw at 10 ℃& nbsp;
Preservation methods for frozen foods
& nbsp; Frozen foods have a certain shelf life, and it's not enough to just store them in the refrigerator without worries. The best thing is that families can regularly clean their refrigerators and freezers to promptly clear the accumulated food. If the prawns put in during the Spring Festival are not eaten until the National Day, it is ignorance.
How to choose frozen food
& nbsp; When making a purchase, the following points should be noted:& nbsp;
Is there any softening phenomenon in the food? If there is softening, it indicates that the storage temperature is too high; When there is a lot of frost on the surface of the food or inside the packaging bag, it indicates that the food has been repeatedly frozen and should be avoided from purchase. Pay attention to whether the products inside the packaging have a natural color; If there are spots or discoloration, it indicates that it has deteriorated& nbsp;
Due to the incomplete disinfection and sterilization of frozen food during the production process, only the activity of pathogenic bacteria in the food is reduced. Once the ambient temperature rises, it is easy to restore the vitality of the bacteria. When food is repeatedly thawed and frozen, its quality begins to change, and its original nutritional content, freshness, and taste will be affected to varying degrees. Some unscrupulous stores sell frozen food that cannot be sold out on the same day, freezes it again at night, and sells it the next day. Although this type of food has not yet spoiled and is cheap, it is not advisable to buy it& nbsp;
It is recommended to choose products that are labeled with the factory name, address, phone number, shelf life, and have intact packaging. Once the rights and interests are damaged, the complainant can also be found to avoid losses& nbsp;
You should choose shopping malls or supermarkets with sufficient power supply and good refrigeration equipment to purchase frozen food.
Every time a purchase is made, frozen food should be picked up after the last minute to avoid leaving the freezer for too long.
Do you eat 30 types of food every day
& nbsp; Adjusting dietary structure and consuming nutrients rationally are concerns for many people. My ideal goal is to consume over 30 types of food every day, which is nutritionally balanced and beneficial for overall health.
& nbsp; & nbsp; Dual employees need to prepare food for their families when they return home. Adopting the home frozen food preservation method, combined with purchased frozen food, it is convenient, time-saving, nutritionally balanced, diverse in dishes, and satisfying for families.
Misunderstandings about frozen food
& nbsp; When it comes to frozen food, people often have two attitudes: either they think it's convenient, scientific, and delicious, or they think it's better to eat less processed food because it lacks nutrition. Is frozen food healthy and nutritious?
Zhang Yonghui, director of the Guangdong Provincial Health Supervision Institute, told citizens not to be afraid of processed foods. Frozen foods preserve the nutrients of natural foods to the fullest extent in their storage methods, which is actually a scientific dietary choice. Especially for people who are busy with work, buying groceries and cooking rice should be done in the shortest possible time. Instead of buying fresh meat and vegetables needed for a week at once and stacking them in the refrigerator to reduce the frequency of going to the market, it is better to choose frozen foods instead. Because the nutrient loss of frozen food is much lower than that of fresh food stored in household refrigerators& nbsp;
Being able to eat the freshest food is certainly the best, but if storage is needed, even if it is frozen in the refrigerator, it is not as beneficial for preserving nutritional value as quick freezing. Freezing food in a household refrigerator takes at least a few hours, while truly frozen food achieves its freezing effect within 15-30 minutes; Quick Freeze” The process ensures that the molecular structure of the food remains largely unchanged and does not resemble; Slow freezing; It also causes nutrient loss& nbsp;
The eating habit of countrymen is to eat fresh and hot food. Refrigerated food is considered "inferior food" and does not taste good. This habit greatly increases the pressure on housewives. At the same time, nutrition cannot be balanced.
& nbsp; How many types of food can a family of three with two employees buy every day? Too much food is wasted and left for the next day to eat, which makes the family unhappy. Vegetables and leaves stored in the freezer for one night lose half of their vitamins, turn yellow, and also grow bacteria and decay.
Currently, there are as many as 3000 varieties of frozen foods in the world, while in China, frozen pastry foods are still the main type, with only over 50 varieties.
& nbsp; & nbsp; Data shows that currently, the per capita annual consumption of frozen food in developed regions is generally over 20 kilograms, and it is increasing at a rate of 30%. Frozen food has become one of the fastest growing foods in the world today.
& nbsp; & nbsp; With the improvement of people's living standards and changes in their attitudes, frozen food; Home” The days will not be far away either.
& nbsp; How to process frozen food at home
& nbsp; The freezing process of water is as follows: when water begins to freeze, it forms ice crystals the size of rice grains, which then expand into larger ice crystals. The ice crystals generated during the freezing process are the main factor affecting the quality of frozen food. The freezing process of foods containing water is basically the same as that of water.
Generally speaking, frozen food and frozen food refer to pre treated food that is rapidly passed through -1 ℃ - within 30 minutes Food stored and transported in an environment below -18 ℃ in the largest ice crystal zone at 5 ℃. Due to the many similarities between frozen food and frozen food, people often refer to them as“ Frozen food;.
& nbsp; Fresh food undergoes rapid freezing, resulting in small ice crystals and intact food tissue, maintaining its original flavor and nutrients& nbsp;
& nbsp; & nbsp; The lowest temperature for household refrigerators is -18C ° C;, Freezing food at this temperature is slow, which will damage the organization of the food and fail to maintain its original flavor and nutrients. The solution is to prevent small ice crystals from turning into large ones during the process of freezing food. The specific method is to cut the food into 1-2 cm thin pieces, place the food on a metal box with good thermal conductivity, etc., and let the food pass through -1 ℃ to -5 ℃° as soon as possible; The largest ice crystal region& nbsp;
The advantages of processing frozen food at home
Reduce the pressure on housewives, balance the intake of nutrients, and achieve diversification of household dishes.
Different seasons have different types of food on the market, and when a certain type of food is released in large quantities, it is fresh and inexpensive. Buy more of these foods at this time, cook them, freeze them, and store them. The family has a small population and cannot finish the purchased food. They freeze and store the food, and eat it in several portions.
On weekends, cook various dishes that your family loves and freeze them for storage. After work, heat them up and they can be eaten.
