A method for extracting dietary fibers from sweet potato residues

Abstract

The present invention discloses a method for extracting dietary fibers from sweet potato residues, and belongs to the field of dietary fiber processing. The method comprises the following steps: alkaline cooking, steam explosion, inoculation pulp preparation, ferment preparation, raw material substrate fermentation, insoluble dietary fiber extraction and soluble dietary fiber extraction. The sweet potato residues are used as raw materials to extract the dietary fibers, turning waste into treasure; using both alkaline cooking and steam explosion pretreatments and low-intensity intermittent ultrasonic assisted microbial fermentation and culture can shorten the production cycle; and the extraction rate and purity of the obtained dietary fibers are > 95.6% and 92%, respectively, making the ratio of the soluble dietary fibers of the dietary fibers extracted from the sweet potato residues up to > 19.8%, so that the dietary fibers extracted from the sweet potato residues have a higher water holding capacity and expansibility and a higher physiological activity.

Description

technical field [0001] The invention belongs to the field of dietary fiber processing and relates to a method for extracting dietary fiber from sweet potato dregs. Background technique [0002] Sweet potato is an important crop with high and stable yield, rich nutrition and wide application. It is mainly used to extract starch, make vermicelli, vermicelli and develop sweet potato beverage. -14%, sweet potato dregs contain a lot of nutrients, including 40-50% starch and 20-30% dietary fiber. At present, many enterprises discharge it with wastewater or use it as feed. According to statistics, about 50 million tons of sweet potato residue are discarded as waste every year. The water content of fresh potato dregs is as high as 80%, and there are more than 30 kinds of bacteria in it. It is not easy to store and transport. After spoilage, it will produce stench and cause serious environmental pollution. If it is dried, the cost will be too high, which will increase the burden on ...

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Problems solved by technology

However, at present, chemical methods are the main method for extracting dietary fiber at home and abroad. This process is simple and the input cost is low, but it has obvious effects on the physical and chemical properties and physiological functions of dietary fiber products during processing, such as hot alkali soaking and repeated water rinsing. The yield of dietary fiber is reduced, and the water holding capacity and expansion force of the product are significantly reduced; at the same time, the utilization rate of potato dregs is low, and a large amount of sewage is inevitably discharged, causing serious pollution to the environment and high treatment costs; there is also the use of enzymatic hydrolysis Dietary fiber with higher purity can be obtained, but the proportion of soluble dietary fiber is not increased, and the physiological activity of the extracted dietary fiber is poor, while the membrane separation method has high cost and is not easy to control in large-scale production.

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