Vacuum freeze drying method for flying fish roe

Abstract

The invention relates to a vacuum freeze drying method for flying fish roe, which relates to a freeze drying method for an aquatic product. The vacuum freeze drying method comprises the following steps of: pretreatment: washing and drying the flying fish roe after impurities on the flying fish roe are cleared, and entering a next step; freezing: delivering the dried flying fish roe into a ultra-low-temperature freezing room to be frozen rapidly, and entering a next step; and vacuum freeze drying: delivering the flying fish roe after being frozen into blocks into a vacuum freeze drying box to be dehydrated so as to acquire the flying fish roe after being vacuum freeze dried. The flying fish roe is dehydrated by a vacuum freeze drying machine through a radiation-type cold-heat exchanging method, the dehydrating rate reaches 75 percent, i.e. four tons of fresh products are dehydrated into one ton of dry products, so that the transportation cost and the storage expense can be greatly reduced, and the refreshing time can be prolonged from 5h to 2 years. When the flying fish roe is rehydrated two years later, original natural appearance shape of the flying fish roe can be maintained, granules are complete, original flavor is still reserved, and the rehydration rate can reach four times, i.e. one ton of dry products can be rehydrated to 4 tons of fresh products. According to the vacuum freeze drying method, not only is freshness maintained, but also the nutrients are reserved.

Description

technical field [0001] The invention relates to a freeze-drying method for aquatic products, in particular to a vacuum freeze-drying method for flying fish roe. Background technique [0002] In the world's oceans, there are nearly 100 species of flying fish, with an annual output of thousands of tons. Flying fish is a collective name for about 40 species of marine fish in the family Exocoetidae of the order Atheriniformes. There are 8 genera (Cheilopogon, Cypselurus Danichthys, Exocoetus, Fodiator, Hirundichthys, Oxyporhamphus, There are 50 species of flying fish of the genus Parexocoetus and the genus Prognichthys. There are 6 genera and 38 species recorded in China and its adjacent waters. The Taiwan Strait has the most, with an annual output of about 2,000 tons. From April to June every year (from late February to May in Hainan Island), flying fish roe is produced. Due to its high edible and medicinal value and delicious taste, flying fish roe is favored by consumers a...

AI Technical Summary

Problems solved by technology

However, after adding a large amount of table salt, the desalination process is complicated, and the salinity cannot be controlled. It must be washed many times, which leads to a large loss of nutrients.

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