Freeze-dried tea samples are bright green in color, fresh and refreshing in taste, pure and refreshing in aroma, largely retaining the original color, aroma, taste, shape and nutritional value of tea, and the shelf life is prolonged. If the quality of freeze-dried tea is poor or the skin is intolerant, it will also cause skin allergies and other symptoms.
Advantages and disadvantages of freeze-dried tea powder;
Freeze-dried tea leaves are processed by vacuum freeze-drying equipment. The principle is that fresh tea leaves are frozen at low temperature and heated in vacuum environment, so that the water in the materials can be directly removed, so that the tea leaves can be dehydrated to obtain freeze-dried products, which reduces the enzyme activity and the decomposition reaction of heat-sensitive substances caused by low temperature.
Therefore, freeze-dried tea leaves can not only effectively retain the original sensory qualities such as active ingredients, color and fragrance, but also have the advantages of thorough dehydration, quick rehydration, light weight, suitable for long-term storage and continuous transportation at room temperature. It is a deep processing technology of agricultural products with industrial prospects.
It is difficult to control the temperature in production, which is easy to cause insufficient dryness, or burn tea leaves because of too high temperature and too long time; The color of tea leaves changes, and the appearance is easily damaged, which leads to the breakage of tea leaves and affects the appearance. Frozen tea technology is widely used in oolong tea, that is, green tea production.