Asparagus dietary fiber and preparation method thereof

Abstract

The invention relates to asparagus dietary fiber and a preparation method thereof. The preparation method comprises the steps that asparagus is washed, dried and crushed into powder; the powder and water are mixed according to the mass ratio of 1:(50 to100), and grinding for homogenizing is conducted by a colloid mill so as to obtain asparagus suspension; the pH of the asparagus suspension is adjusted to 3.0-7.0, and stirring and extracting are conducted at the temperature of 60 DEG C-100 DEG C for 1 h-3 h; an extracting solution is centrifuged while hot, and precipitates are subjected to freeze drying to obtain asparagus insoluble dietary fiber; preheated 95% ethanol with 2-5 times of the volume at 60 DEG C is added into supernatant, and then the supernatant is subjected to still standingat 4 DEG C for ethanol precipitation for 12 hours; and the supernatant subjected to ethanol precipitation is centrifuged, and precipitates are collected to obtain the asparagus soluble dietary fiber.Through the method, the extraction rate of the soluble dietary fiber can be effectively increased, no wastewater and waste residue are generated in the extraction process, an extraction technology issimple and good in yield, the environment is not polluted, the production cost of enterprises can be lowered, and economic benefits are increased.

Description

technical field [0001] The invention relates to the field of food technology, in particular to a dietary fiber from asparagus and a preparation method thereof. Background technique [0002] In recent years, with the substantial improvement of people's living standards and increasingly refined diets, some modern civilization diseases such as diabetes, cardiovascular disease, obesity, intestinal cancer, and constipation have become more and more common. Dietary fiber, as a functional factor of health food, has also received extensive attention and rapid development in various countries in the world in recent years. Many food experts regard dietary fiber as functional food and popular food in the 21st century. Today, as the dietary composition becomes more and more refined, dietary fiber has become a matter of concern to academic circles and ordinary people, and has been supplemented and identified as the seventh type of nutrient by the nutritional circles, which is different ...

AI Technical Summary

Problems solved by technology

It adopts fermentation method and enzymatic method to prepare asparagus dietary fiber, the preparation process is mild, and has little environmental pollution, but the preparation method is complicated, the process parameters are difficult to control, and it is easy to cause microbial contamination, which takes a long time and increases the cost of the enterprise

For the extraction of other dietary fibers, such as the microwave-ultrasonic combined extraction method, the extraction time is short and there is no pollution to the environment; but its soluble dietary fiber yield is low, and ultrasonic energy consumption is wasted.

Extraction with hydrochloric acid, sodium hydroxide combined with enzymatic hydrolysis will cause pollution to the environment due to the use of a large number of chemical reagents

[0004] Therefore, the current method for preparing dietary fiber still needs to be improved

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