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Under the active temperature, it is beneficial to inhibit the reproduction of microorganisms and their biochemical reactions; the residence time of food in the freezing equipment is short

Release time:

2024-02-01

Generally speaking, quick-frozen foods that meet the five elements of quick-frozen foods should have the following advantages: avoiding the generation of large ice crystals between cells; reducing the external separation of water in cells, and reducing the loss of juice during food thawing; in the process of freezing, the harm of concentrated residual water decreases; rapidly reducing the temperature of food to the temperature of microbial growth and activity is conducive to inhibiting the reproduction of microorganisms and their biochemical reactions; the short residence time of food in the freezing equipment is conducive to improving the utilization rate and continuous production of the equipment.

Before the start of the experiment, both groups reported an average daily intake of about 2400 calories; the subjects weighed about 97kg and had a body mass index (BMI) ranging from 26 to 42, making them overweight or obese. During the eight-week diet, all subjects reduced their average daily caloric intake to 1700 calories and lost weight as a result. However, compared with the first group of subjects (only 5.1kg), the second group of subjects who used packaged frozen staple foods lost more weight, reaching 7.4kg, and their average body mass index was also reduced by one more than the former. unit. For this result, the researchers believe that for those who eat the processed frozen staple food, the collocation of each part of the nutrients is easy to control and adjust, while preparing the staple food by themselves, they need to pay attention to the collocation when cooking. In fact, it is difficult to accurately follow the requirements of the "nutrition pyramid" and it is easier to make mistakes. Whether the subjects can maintain their current weight depends on whether they can maintain this scientific diet. In fact, the success of this study is to show people how effective and important a strict diet is to control weight. The expert who led the study also said, "In fact, the problem is really that simple."

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Rapid freezing causes food to form tiny ice crystals

Quick freezing generally refers to the use of modern freezing technology to reduce the temperature of food to a certain temperature below its freezing point in the shortest possible time, so that all or most of the water contained in it will form reasonable with the external heat of the food. Small ice crystals minimize the liquid moisture necessary for the life activities of microorganisms in food and the biochemical changes of food nutrients, A way to maximize the preservation of the original natural quality of food.

Characteristics of frozen food

General quick-frozen food should have the following five elements (characteristics): freezing should be carried out at 30~18 ℃, and should be completed in about 20 min; The temperature is rapidly reduced to below the temperature of microbial growth activity, which is conducive to inhibiting microbial activity and enzymatic biochemical reactions. The central temperature of frozen food should reach below -18~15 ℃, water in quick-frozen food forms numerous needle-like small ice crystals with a diameter of less than 100 μm to avoid the formation of large particles of ice crystals in the intercellular space. The distribution of ice crystals is similar to that of liquid water in raw materials, causing little damage to cell tissue structure. When food is thawed, the water melted by ice crystals can be quickly absorbed by cells again without juice loss.

Quick-freezing equipment

The general trend of food quick-freezing technology is low temperature and rapid freezing, and the form of frozen products has also developed from large disk-shaped freezing to monomer rapid freezing. At present, China's quick-freezing device can be roughly divided into strong blowing continuous quick-freezing device, tunnel freezing device, contact freezing device, direct freezing device.

How to lose weight quickly with frozen foods

The volume of food is also one of the factors that affect the weight loss effect of dieters, according to researchers in the United States. Nutritious frozen foods are easy to consume and can be used as a method of controlling food volume.

At present, China's quick-freezing device can be roughly divided into strong blowing continuous quick-freezing device, tunnel freezing device, contact freezing device, direct freezing device.

Nutrition experts working in the University's Food Science Laboratory compared the two dietary regimens, with subjects using the first dietary regimen eating their own food prepared according to the "nutrition pyramid" as a guide. Subjects who adopted the second diet plan ate packaged frozen food as the main meal every day, and configured auxiliary dishes according to the "nutrition pyramid. Both diets contain 1700 calories per day and equal amounts of carbohydrates, protein, and fat. Before the start of the experiment, both groups reported an average daily intake of about 2400 calories; the subjects weighed about 97kg and had a body mass index (BMI) ranging from 26 to 42, making them overweight or obese.
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