Process for drying and dehydrating fruit, vegetable and Chinese medicinal herb through medium-pressure and high-pressure gas permeation

Abstract

The invention discloses a process for drying and dehydrating fruits, vegetables and Chinese medicinal herbs through medium-pressure and high-pressure gas permeation, which is mainly suitable for the Chinese medicinal herbs and non-berry fruits and vegetables such as apples, pineapples, Hami melons, potatoes, burdocks, lotus roots, green sword beans, corns, Polygonum multiflorum, Lucid ganoderma and the like. The process comprises the steps of: washing the fruits, the vegetables and the Chinese medicinal herbs clean, removing free water, putting the materials in a pressure vessel, filling gas into the pressure vessel to enable pressure in the pressure vessel to reach more than 1MPa, maintaining the pressure for more than 10min, rapidly releasing the gas, transferring the materials to a vacuum drying oven in a short time and drying the materials under a low-temperature vacuum condition until the water content of the materials is below 5 percent to obtain finished products. The process has the positive effects that since drying and dehydration are conducted in the low-temperature vacuum condition, the losses of the nutrition and the flavors of the fruits, the vegetables and the Chinese medicinal herbs during high-temperature drying are avoided, the original nutrition, the active substances, the active constituent, the color, the fragrance and the taste of the materials are reserved to the utmost extent, the equipment investment is small, the process cost is low, the installation and the maintenance are convenient and the process is easy to master.

Description

technical field [0001] The invention relates to a technique for drying dehydrated fruits and vegetables and Chinese herbal medicines by adopting medium-high pressure infiltration in gas. It is mainly suitable for non-berry fruits and vegetables such as apples, pineapples, cantaloupe, potatoes, burdock, lotus root, green beans, corn, Polygonum multiflorum, Ganoderma lucidum, and Chinese herbal medicines. Background technique [0002] At present, the dehydration of fruits, vegetables and Chinese herbal medicines generally adopts hot air drying and vacuum freeze drying processes. The hot air drying dehydration process has the characteristics of small equipment investment, simple process, and easy operation, but it has serious loss of nutrients, poor flavor, poor rehydration degree, slow rehydration speed, long dehydration time, high energy consumption, and low production efficiency. Low, poor sanitary conditions and other defects; the vacuum freeze-drying process uses freeze-d...

AI Technical Summary

Problems solved by technology

It solves the shortcomings of the prior art, such as high loss of nutrients, poor flavor, taste, color and aroma, poor rehydration, poisonous, and high process cost.

However, this method only removes part of bound water and free water, and the resulting fruit and vegetable foods are not crisp enough and are not easy to preserve due to high moisture conte...