Method for preparing soluble plantain seed dietary fiber and application thereof

Abstract

The invention provides a method for preparing soluble plantain seed dietary fiber and application thereof. The method is characterized by comprising the following steps: (1) subjecting plantain seed to sieving, impurity removal and hot-water extraction; (2) combining and concentrating the water extract until the specific gravity thereof is 1.02 to 1.10, adding soluble salts with the concentrationthereof being 0.3% to 7%, further adding ethanol precipitation until the concentration thereof reaches 30% to 55%, and subjecting the precipitation to centrifugal separation and ethanol (85%) rinsing; and (3) drying and grinding the precipitation in step (2) to obtain the soluble plantain seed dietary fiber powder or the plantain seed dietary fiber solution. The invention has the following advantages: 1, the method is capable of removing most soluble impurities, so the obtained soluble plantain seed dietary fiber has lighter color, higher purity and better water-solubility; compared with the ethanol precipitation with the mass concentration thereof being adjusted to 66.7%, the ethanol for ethanol precipitation can be saved by 55% under the optimal conditions; and the added salts or acids for ethanol precipitation are food additives, so the product subjected to ethanol precipitation and rinsing is almost residue-free; 2, the prepared soluble plantain seed dietary fiber is applicable tofood, health-care food or drug achieving the effects of moistening the intestine and relaxing the bowel; and 3, the process has the advantages of simple operation, water-saving, energy-saving and environment-friendly application, so the method is applicable to industrialized production.

Description

Technical field [0001] The invention relates to a preparation method and use of dietary fiber, in particular to a preparation method and use of psyllium soluble dietary fiber. Background technique [0002] Dietary fiber refers to the polymer of carbohydrates that cannot be digested and absorbed in the small intestine. Its degree of polymerization (DP) is not less than 3, and has many important physiological functions for human health. It is recognized by modern medicine and nutrition as the traditional six major The "seventh nutrient", which is a juxtaposition of nutrients, is classified into soluble dietary fiber and insoluble dietary fiber according to its solubility in hot water. The essence of the soluble dietary fiber of Psyllium is polysaccharides. It is a nutritious food with special physiological and health care functions. It can supplement the dietary fiber needed by the human body. After entering the human digestive system, it produces special physiological metabolic fu...

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Problems solved by technology

[0004] Existing open technology Chinese patent at present: publication number is CN101269124A " a kind of plantago polysaccharide oral preparation, preparation method and application " patent document adopts microwave extraction, and the amount of water added is 10-15 times of plantago weight, then concentrates, Then add 2 times the weight of absolute ethanol for alcohol precipitation. This method directly uses a large amount of absolute ethanol for precipitation, making the ethanol mass concentration as high as 66.7%. The psyllium soluble dietary fiber will wrap a large amount of water-soluble Sexual impurities, the prepared psyllium soluble dietary fiber has a darker color, lower purity, and poor water resolubility

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