Freshness is an important index to determine the value of these fresh agricultural products. Fresh agricultural products mainly include vegetables, fruits, flowers, meat, eggs, milk and aquatic products and other essential necessities in our daily life. We used to call it "three fresh", that is, fruits and vegetables, meat and aquatic products. Freshness is an important index to determine the value of these fresh agricultural products.
It can be said that the freshness of fresh agricultural products directly affects our health, so the safety of fresh agricultural products needs to be paid attention to.
What are the preservation methods of agricultural products?
Fresh agricultural products are perishable, seasonal and regional, which greatly restricts their storage, market supply and product development. Due to the relative lag of storage and processing technology, the corruption loss of fresh agricultural products in China is very serious. The preservation of fresh agricultural products is the key to ensure the stable quality of agricultural products during storage and realize the transaction in different places or off-season.
Although various preservation technologies have different emphases, they are all key factors affecting the quality of fresh agricultural products. The main preservation technologies of fresh agricultural products include low temperature preservation, chemical preservation, modified atmosphere preservation and ultra-high pressure preservation.
Among these preservation methods, low temperature means controlling temperature, and chemistry is also obvious, that is, chemical preservation methods such as preservatives, and high pressure should not be difficult to understand. Modified atmosphere preservation is unfamiliar to everyone. Modified atmosphere preservation is to achieve the purpose of storage and preservation by controlling the proportion of gases. Modified atmosphere preservation technology is a technology to extend the storage period and shelf life of food by adjusting the gas environment.
Its basic principle is: in a certain closed system, the regulated gas different from the normal atmospheric composition is obtained through various regulating methods to inhibit the physiological and biochemical processes and microbial activities that lead to food spoilage. The key of modified atmosphere preservation technology is to adjust the gas. In addition, when selecting and adjusting gas composition and concentration, two very important control conditions, temperature and relative humidity, must be considered.
We should not only pay attention to the individual effect, but also pay special attention to the overall comprehensive effect of the environment composed of various conditions. For example, different varieties of apples need different storage environments, so they can't be placed in a cold environment immediately after picking. Generally, commercial refrigerators can only store fruits for several months, but what about refrigerators at home? It may only last for a few weeks.
For fresh e-commerce companies, product preservation is a very important relief. Only by keeping fresh and ensuring the quality of products can we attract consumers.
In short, fresh agricultural products are actually some fresh primary products such as vegetables, meat and some eggs. Regarding the preservation of fresh agricultural products, there are many preservation methods of fresh agricultural products, and the costs of these preservation methods are different. When choosing a fresh-keeping method, fresh e-commerce must choose according to its own scale and cost.