Barbary wolfberry fruit hot-air drying method using cold ion pretreatment

Abstract

The invention discloses a barbary wolfberry fruit hot-air drying method using cold ion pretreatment. The hot-air drying method comprises the steps as follows: 1) performing cold ion pretreatment on barbary wolfberry fruits; and 2) performing hot-air drying on the barbary wolfberry fruits treated by the step 1) to realize drying treatment of the barbary wolfberry fruits, wherein cold ion treatmentis performed for 15 s-60 s, the conditions of cold ion pretreatment are as follows: air serves as a cold ion generation source, the distance between a nozzle of a cold ion device and a barbary wolfberry fruit sample is 4-8 cm, the cold ion body flow is 2-4 L / min, the pulsation frequency is 15-30 kHz, and power is 600-900 w. The invention provides the cold ion pretreatment for drying the barbary wolfberry fruits, surfaces of the barbary wolfberry fruits after cold ion treatment can be etched and have micropores, barrier of wax coats on the surfaces of the barbary wolfberry fruits is broken through, and compared with non-pretreated barbary wolfberry fruit samples, the barbary wolfberry fruit sample greatly shortens the drying time and reduces energy consumption. Besides, the rehydration ratio, color and other physical and chemical qualities of the barabry wolfberry fruits are better kept.

Description

technical field [0001] The invention relates to a method for hot-air drying wolfberry by using cold ion pretreatment, and belongs to the technical field of agricultural product processing. Background technique [0002] Lycium barbarum is a kind of herb of Solanaceae, which is widely distributed in the world. At present, my country is the main producer and exporter of wolfberry. It has high economic value. As a functional food and traditional Chinese herbal medicine, it has been widely used for more than 2500 years. Goji berries have high nutritional value and contain many health-promoting bioactive substances, including flavonoids, polyphenols, vitamins, and goji berry polysaccharides. [0003] The moisture content of fresh wolfberry fruit is relatively high, which is susceptible to microbial infection and has a short storage period. At present, the main form of wolfberry sold in the market is dried fruit of wolfberry. Drying is a key unit operation in the production of wol...

AI Technical Summary

Problems solved by technology

In recent years, the pretreatment technology that has been used includes gas jet impingement blanching pretreatment technology, which can increase the drying rate of wolfberry, but the blanching temperature is too high, and heat treatment may lead to the degradation of physical and chemical quality of agricultural products such as color degradation, so the development of non-toxic Heat pretreatment is very necessary

Freeze pretreatment technology is applied in vacuum freeze-drying. The dried wolfberry fruit obtained by this technology has good color and high retention of biologically active substances, but the whole process takes too long, usually more than 24 hours, and consumes a lot of energy. Vacuum freeze-drying High cost, not conducive to mass production

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