Preparation method for soluble dietary fiber with apple pomace as raw material

Abstract

The invention discloses a preparation method for a soluble dietary fiber with apple pomace as a raw material. According to the method, an expanding method and an enzymatic hydrolysis method are combined. By the application of an expansion process, the structures of cellulose molecules become loose, and partial glycosidic bonds are broken, so that partial insoluble dietary fibers are transformed into soluble ones. After separation of the insoluble dietary fibers and the soluble dietary fibers, the expanded insoluble dietary fibers, which have the loose molecular structures, are hydrolyzed by utilizing a cellulase; and then the insoluble dietary fibers are further transformed into soluble dietary fibers. According to the invention, the modification of the insoluble dietary fibers in the apple pomace enables the insoluble dietary fibers to become high-quality soluble dietary fibers, so that an achievement rate of the soluble dietary fibers can substantially be enhanced as well as water binding capacity and expansibility of dietary fibers can also be improved. According to the test, the achieve rate of the soluble dietary fibers can reach 21.2%; the water binding capacity and expansibility can be enhanced by 110.3% and 7.0% respectively.

Description

technical field [0001] The invention relates to a method for preparing dietary fiber, in particular to a method for preparing soluble dietary fiber from apple pomace. Background technique [0002] At present, dietary fiber has been called the "seventh largest nutrient" alongside protein, carbohydrates, fat, water, minerals and vitamins by nutritionists and medical scientists, and its sources mainly include fruits, vegetables and grains. Dietary fiber is divided into insoluble fiber (IDF) and soluble fiber (SDF). There are many varieties and large quantities of foods containing insoluble dietary fiber, mainly found in wheat bran, corn bran, celery, fruit peels and root vegetables, and a large part of these substances are by-products of food processing. Because insoluble dietary fiber has rough and poor taste sensory properties in food, by-products containing a large amount of insoluble dietary fiber are often used in the production and processing of feed. The research and p...

AI Technical Summary

Problems solved by technology

The research and production of insoluble dietary fiber modification in my country is still in its infancy, and most of them are based on improving and increasing the water holding capacity and swelling capacity of insoluble dietary fiber. Separation of modified soluble and insoluble fiber is less , so that the characteristics of soluble fiber cannot be fully reflected in use, and the yield of soluble fiber is also low (about 15%)

[0003] At present, the modification and extraction methods of dietary fiber mainly include acid method, alkali method, puffing method, fermentation method, enzymatic hydrolysis method, etc. The degree of hydrolysis of cellulose by acid and alkali methods is often too large, and causes environmental pollution; puffing method Or the single process of enzyme method makes the yield of soluble fiber not high, and the process conditions of fermentation method are complicated and difficult to control

We believe that the low degree of hydrolysis of insoluble cellulose glycosidic bonds caused by improper process conditions, modification and single extraction method, or the small molecule carbohydrates produced by excessive hydrolysis are the fundamental reasons for the low yield of soluble fiber

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