Stearic Acid, or octadecanoic acid, is produced by the hydrolysis of oils and fats and is mainly used in the production of stearates. It is white waxy transparent solid or slightly yellow waxy solid. Stearic acid is widely used in the manufacture of PVC plastic pipes, plates, profiles and films. It is a PVC heat stabilizer with good lubricity and better light and heat stabilization. In plastic PVC pipes, stearic acid helps prevent "coking" during processing, and is an effective heat stabilizer when added to PVC film processing, as well as defending the finished film from discoloration caused by exposure to sulfide.
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For a long time, China's agricultural products have suffered serious post-harvest losses, and the circulation rate of fruits and vegetables has reached 25%. In developed countries, the loss rate of fruits and vegetables is generally controlled below 5%. It is understood that the direct loss of fruit and vegetable decay in China is as high as 100 billion yuan. In addition, compared with foreign countries, the comprehensive utilization rate of agricultural products such as fruits and vegetables in China is not high. Therefore, on the one hand, China has continuously strengthened the construction of cold chain logistics facilities, on the other hand, it has encouraged the development of fruit and vegetable processing industry, which has greatly improved the comprehensive utilization rate of fruits and vegetables.
With the upgrade of consumption, people pay attention to healthy and nutritious fruit and vegetable deep processing products*, such as mixed fruit and vegetable powder, which is favored because it retains natural vegetables, fruit flavor and high nutrient content. According to the author's understanding, mixed fruit and vegetable powder is mainly processed through drying and pulverizing process. Because of the low moisture content of the mixed fruit and vegetable powder through processing, it not only prolongs the shelf life and storage period of the product, but also reduces the related costs of transportation, packaging and storage of agricultural products such as fruits and vegetables, and reduces the circulation and decay rate of fruits and vegetables.
It is understood that the mixed fruit and vegetable powder is firstly juiced by fresh fruits and vegetables, and then dried and pulverized by a fruit and vegetable dryer and a pulverizer, and then made into a dry powder-like nutrient powder. However, some industry* pointed out that the traditional methods of drying and smashing fruits and vegetables are mainly based on intense heat treatment, while in the hot processing process for a long time, it is easy for the mixed fruit and vegetable powder to lose the natural vegetable and fruit flavor and lose the freshness of the raw materials. The nutritional content of the product is also destroyed, and the taste and quality are not good.
In order to better solve the problems of flavor and quality and poor quality brought by traditional hot processing, the processing of mixed fruit and vegetable powder at home and abroad is developing in the direction of low temperature freeze-drying and ultra-fine pulverization. “By introducing low-temperature freeze dryer, the mixed fruit and vegetable powder is dried in low temperature treatment, which reduces the problems of denaturation and deactivation of raw materials caused by traditional high-temperature drying process. It also solves the problem of heat-sensitive materials burning at high temperature and ensuring fruits and vegetables. Powdery taste," one manufacturer said.
If the low-temperature freeze-drying technology can ensure the flavor and quality of the mixed fruit and vegetable powder, then the low-temperature ultra-fine pulverization technology can make the granules of the fruits and vegetables reach the micron size, the particles are more refined, the taste is more delicate, and the mixed fruit and vegetable powder is improved. Water-soluble, making its nutrients easier for the body to digest and absorb. Ultra-fine pulverization technology is a high-tech that has been rapidly developed in the past 20 years. It can pulverize fruits and vegetables to ultra-fine powders of 10μm or even 1μm.
In addition, the ultrafine pulverizer is provided with a temperature control system, which can utilize the characteristics of materials having different properties at different temperatures to pulverize the fruits and vegetables under low temperature conditions, so that the local accumulation of heat can be effectively prevented during the pulverization process. It not only prevents excessive heat accumulation, but also causes the burnt taste of powdery and other heat-sensitive materials, and retains the activity and various nutrients of the mixed fruit and vegetable powder to a certain extent, reduces the loss of active ingredients, and ensures the flavor and quality of the product.
Today, in the foreign fruit and vegetable food and health care products market, the share of mixed fruit and vegetable powder is constantly expanding. Looking back at the domestic market, with the improvement of living standards, people pay more and more attention to nutrition and health products. Perhaps mixed fruit and vegetable powder with natural vegetable and fruit flavors and high nutrient content will be favored by consumers. The low-temperature freeze-drying and ultra-fine pulverization technology will also play an increasingly important role in ensuring the flavor and quality of mixed fruit and vegetable flour.
Fruit and vegetable powder is concerned about freeze-drying and ultra-fine grinding technology to ensure nutrition and quality
Traditional processing methods, such as pickled, dried, canned and other fruit and vegetable deep processing products, have been difficult to meet the needs of upgrading the consumer market and improve corporate efficiency, "health, nutrition, safety" fruit and vegetable products have become a new consumer trend. At present, fruit and vegetable processing products mainly include fresh-cut fruits and vegetables, fruits and vegetables, fruit and vegetable drinks, freeze-dried fruits and vegetables, mixed fruit and vegetable powder. Among them, mixed fruit and vegetable powder began to be loved by consumers as a new nutritious health food.