A kind of preparation method of concentrated grape juice

Abstract

The invention discloses a preparation method of concentrated grape juice. The method comprises the steps of preparing grape primary pulp, performing primary filtering and primary sterilization, cooling for reducing the temperature, carrying out enzymatic hydrolysis and clarification, and performing secondary filtering, vacuum concentration, secondary sterilization and filling. The preparation process is simple, and no any chemical reagent and food additive are added in a preparation process, so that the nutrition and flavor of grapes are kept to the maximum extent, and the green and safe properties of the food are effectively ensured; and besides, the clear grape juice after enzymatic hydrolysis, clarification and filtering has a color value of more than 90%, a turbidity of less than 2NTU, a light transmittance of more than 96%, a sugar content of 3.5-4% and an acidity degree of 35-45%; the solid content of the concentrated grape juice after vacuum concentration is 40-60%; and the concentrated grape juice has fragrance and taste of grapes, has no peculiar smell, is clear and transparent, can be stored for a long time, has no sediments and suspended solids during storage, has strong product stability and can completely meet the taste requirement of mass consumers.

Description

technical field [0001] The invention belongs to the technical field of food processing, and in particular relates to a method for preparing concentrated grape juice. Background technique [0002] Grape is one of the fruits with the largest planting area in the world, and its output also ranks in the forefront of the world's fruit output, playing an important role in the national economy and world trade. Grapes are planted in large areas in my country, mainly distributed in Xinjiang, Hebei, Shandong, Liaoning, Gansu, Henan, Ningxia, Yunnan, etc. Grapes have high nutritional value, in addition to being rich in sugar, acid and multivitamins , It also contains functional nutrients such as resveratrol, proanthocyanidins, and tannins. At present, about 80% of my country's grape production is used for wine making, 12% is used for fresh food, and 8% is used to make raisins. There are very few grape raw materials used to make grape juice. In addition to water, it contains sugars, var...

AI Technical Summary

Problems solved by technology

Although there are also a large number of grape juice concentrates sold in the market, the production of these grape juices has shortcomings such as low technical content and unstable product quality. At the same time, various food additives are added during processing, and the inherent nutrition of grapes is seriously lost. , not only lost the original natural flavor but also destroyed its nutritional value