A process for producing oral blueberry powder by vacuum freeze-drying

Abstract

The invention provides a process for producing oral blueberry powder by vacuum freeze-drying method. The blueberry fruit is cleaned and drained for later use; the drained blueberry fruit is pre-frozen at -20 to -25°C, and the vacuum degree is 10 to 30 mTorr. Keeping constant temperature for 2-20 hours; crushing at -20 to -25° C. to obtain crude blueberry freeze-dried powder. The process route is simplified, and the present invention does not need a long-term high-temperature sublimation process to obtain blueberry freeze-dried powder, which reduces production costs; reduces the heating steps, and further improves the protection of active substances in blueberries; the processing process can avoid high temperature and high humidity, light, and oxidation The influence of factors such as protecting the whole active substance of blueberry; Through comparative measurement the content of anthocyanin contained in the blueberry freeze-dried powder produced by the preparation method of oral blueberry freeze-dried powder provided by the present invention is about 3.0mg / g, conventional method The anthocyanin content contained in the prepared blueberry freeze-dried powder is about 2.4 mg / g, and the anthocyanin content is increased by 15-20%.

Description

technical field [0001] The invention provides a process for producing oral blueberry powder by vacuum freeze-drying, which belongs to the technical field of food industry. Background technique [0002] Blueberry (Blueberry) is a perennial green leaf or evergreen shrub, and the fruit is a berry. Blueberry fruit is rich in anthocyanins (anthocyanins), which mainly have the effects of antibiotics, anti-free radicals, anti-vision degradation, and anti-arteriosclerosis and thrombosis. [0003] At present, in the traditional fruit and juice preservation process, high temperature and high pressure sterilization is basically used to solve the corruption problem caused by microbial pollution. Studies have shown that the loss rate of anthocyanins in blueberry fruits is about 50% under high temperature and high humidity conditions, vitamin C Loss of more than 15%, vitamin A will lose more than 30% when stored under high temperature and high humidity for 3 months. In addition, the lig...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for producing oral blueberry freeze-dried powder by vacuum freeze-drying, which solves the shortcomings of the existing blueberry active freeze-dried powder preparation method, which has a cumbersome process route and low content of active substances in the blueberry freeze-dried powder. The present invention The process route is simple, the production conditions are relatively low, and the prepared blueberry freeze-dried powder has a high content of active ingredients