Asparagus strips and preparation method thereof

Abstract

The preparation method comprises the following steps: heating fresh asparagus strips in a free oscillation type parallel pole plate radio frequency heating system with the power of 6kW and the frequency of 27.12 MHz for 2-4 minutes, taking out the fresh asparagus strips, and quickly cooling the fresh asparagus strips to about 4 DEG C in a refrigerator; setting the temperature of the heat pump drying machine to 35-45 DEG C and the humidity to 35-40%, putting the asparagus strips into the heat pump drying machine, filling nitrogen, when the oxygen content of the heat pump drying machine is higher than 3-5%, repeating the nitrogen filling operation, circularly treating for 3-5 hours, taking out the asparagus sample tray, putting the asparagus sample tray in a normal-temperature environment for balancing for 20-30 minutes, putting the asparagus sample tray into the heat pump drying machine again, and carrying out heat preservation for 20-30 minutes under the conditions of 45-55 DEG C and the humidity to 30-35%. Treating for 3-5 hours; and taking out the asparagus strips, packaging with nitrogen, and storing at 4 DEG C. The asparagus strips prepared by the method disclosed by the invention can be effectively prevented from browning and spoilage, meanwhile, the problems of soft tissues, nutrient loss, unsafe eating and the like caused by traditional drying are solved, and the prepared asparagus strips are uniform in internal texture, bright in color and luster and quick in rehydration.

Description

technical field [0001] The invention belongs to the technical field of asparagus processing, in particular to a preparation method of asparagus strips and asparagus strips prepared by the preparation method. Background technique [0002] Asparagus is rich in a variety of amino acids, proteins and vitamins, and its content is higher than that of ordinary fruits and vegetables, especially asparagine and trace elements selenium, molybdenum, chromium, manganese, etc. in asparagus, which can regulate body metabolism and improve body immunity. The efficacy of asparagus has strong inhibitory and pharmacological effects in the prevention and treatment of hypertension, heart disease, leukemia, blood cancer, edema, cystitis, etc. In recent years, with the enhancement of people's health awareness, the demand for asparagus increase yearly. [0003] Drying is one way to keep asparagus from spoiling. There are many methods for drying asparagus, such as sun drying, boiling, drying, spray...

AI Technical Summary

Problems solved by technology

Therefore, its damage to the dry raw material components is less than that of other drying methods. This advantage makes it widely used in many fields, but it cannot be ignored that it still has some unavoidable shortcomings, such as vacuum freeze-drying due to simultaneous Using vacuum system and cryogenic system, long-term operation will lead to a large amount of energy consumption

[0005] In order to improve the stability of asparagus during hot-air drying, hot water blanching or additives are often used for pretreatment. Hot water blanching causes asparagus to be soaked in water, and there is a problem of loss of nutrients; additives are used for color protection treatment , there are also potential risks that are not conducive to eating health