Making method of dried pitaya peel fruit

Abstract

The invention relates to a making method of dried pitaya peel fruit. The method comprises the following steps of (1), pretreatment of a raw material: removing the peel of the pitaya, washing the peel by using distilled water, trimming, and slitting for later use; (2), sugar soaking: soaking the peel of the pitaya, which is subjected to the pretreatment, into a sugar alcohol solution, and treating by using an ultrasonic wave; (3), congealing: putting the peel of the pitaya, which is subjected to sugar soaking treatment, into a refrigerator for freezing until free water and bound water in the peel of the pitaya are both congealed; (4), sublimation drying: putting the peel of the pitaya, which is subjected to congealing treatment, into a vacuum freeze drier, and meanwhile, turning on a vacuum pump to extract air in the dryer; (5), desorption drying: putting the peel of the pitaya, which is subjected to the sublimation drying, into a freeze dryer, and meanwhile, turning on the vacuum pump, wherein the moisture of the freeze-dried peel is always maintained to be between 2 percent and 4 percent; further, the peel is subjected to collapse, coking and oxidation; (6), packaging: charging nitrogen for packaging the freeze-dried peel of the pitaya by using an aluminum foil-polyethylene material.

Description

technical field [0001] The invention relates to a method for making dried dragon fruit peel, in particular to the technical field of manufacturing technology for dried dragon fruit peel. Background technique [0002] Dragon fruit not only contains nutrients such as polysaccharides, dietary fiber, and organic acids, but also contains vitamins and mineral elements such as potassium, calcium, and magnesium. It has high nutritional value and can be eaten as a fruit. It also has certain medicinal value. At present, dragon fruit is planted on a large scale in China's southern regions such as Taiwan Province, Hainan, and Fujian, and a good industrial chain has been formed. The fruit of dragon fruit is rich in nutrition, mostly raw pulp, and its processing characteristics are also very good. It can be used to process various nutritional and health foods such as fruit juice, fruit wine, canned food and ice cream, but most products are still in the experimental stage. Commercially ava...

AI Technical Summary

Problems solved by technology

Extracting the nutrient elements in the peel is only using a single component in the pitaya peel, and the extraction technology is not mature enough at this stage, and the extraction rate of anthocyanins, pectin, and dietary fiber is low