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Preparation method of soluble dietary fiber prepared from lotus rhizome nodes

A dietary fiber and soluble technology, applied in the field of food processing, can solve problems such as unfavorable processing, high requirements on reaction conditions, complicated processes, etc., and achieve the effects of enhancing process characteristics and physical and chemical properties, reducing production costs, and simplifying the preparation process.

Active Publication Date: 2015-01-07
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical method has long reaction time, low conversion rate, complex process, high temperature, high requirements for equipment, and the introduction of a large number of anions and cations, which will bring disadvantages to the next step of processing and cause greater environmental pollution.
Enzymatic modification is limited to a certain extent due to the high price of enzyme preparations and high requirements on reaction conditions.
Wu Jiang'e (see: Wu Jiang'e. Microbial Degradation and Transformation of Lotus Root Dietary Fiber. [Master's Dissertation]. Wuhan: Huazhong University of Science and Technology, 2006) and Gu Zhenxin (See: Gu Zhenxin, Han Yongbin, Liu Mengyu, etc. A Solid-state fermentation preparation method of lotus root dietary fiber and its products, CN101513238A, 2009) The research on lotus root dietary fiber shows that the biological fermentation method can increase the yield of dietary fiber and the content of soluble dietary fiber, but the physical and chemical properties of the dietary fiber obtained by the former have no significant advantages, and the latter The preparation method of the latter has been patented (publication number CN 101513238A, published on August 26, 2009). This method uses lotus root dregs as raw material, and the SDF content in the obtained lotus root dietary fiber is relatively high, and the quality is good. After solid-state fermentation, multiple activation processes such as heating and drying, extruding, and ultrafine pulverization are required. The process is relatively complicated, and the production cycle is as long as nearly 20 days. SDF is not extracted, and the obtained products are SDF and insoluble dietary fiber ( IDF) and a mixture of other substances, the purity of SDF is low

Method used

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  • Preparation method of soluble dietary fiber prepared from lotus rhizome nodes
  • Preparation method of soluble dietary fiber prepared from lotus rhizome nodes
  • Preparation method of soluble dietary fiber prepared from lotus rhizome nodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of lotus root joint soluble dietary fiber, the steps are:

[0026] (1) Drying of lotus root joints: wash and dry fresh lotus joints until the water content is less than or equal to 7%, then crush them, pass through a 35 or 38 or 40 or 42 or 45 mesh sieve, and adjust the material moisture of lotus joint powder to 12 or 14 or 16%.

[0027] (2) Extrusion and expansion: DS32-II twin-screw extrusion extruder (Jinan Saixin Co., Ltd.) is used for extrusion treatment, and the extrusion temperature is 120 or 125 or 130 or 135 or 140 or 150 or 155 or 160 or ℃ , Screw speed 105 or 125 or 145 or 165 or 175r / min.

[0028] (3) Ultrasound-assisted alkaline enzymatic extraction of SDF:

[0029] a. crush the lotus root powder after extrusion and puffing, pass through a 35 or 38 or 40 or 42 or 45 mesh sieve, and then dissolve the lotus root powder in water by the weight ratio of the lotus root powder and water at 1:10, At the same time, add α-amylase accounting fo...

Embodiment 2

[0033] (1) Drying of lotus root joints: Wash and dry the fresh lotus joints until the water content is less than or equal to 7%, then crush them, pass through a 40-mesh sieve, and adjust the material moisture of lotus joint powder to 16%.

[0034] (2) Extrusion and puffing: DS32-II twin-screw extrusion puffing machine is used for extrusion treatment, the extrusion temperature is 160°C, and the screw speed is 150r / min.

[0035] (3) Ultrasound-assisted alkaline enzymatic extraction of SDF:

[0036] a. Grind the extruded and puffed lotus root powder, pass through a 40-mesh sieve, then dissolve the lotus root powder in water according to the weight ratio of the lotus root powder and water at 1:20, and add 3 Or 4 or 5% α-amylase, the temperature is controlled at 59 or 61 ° C, and the hydrolysis is 1.5 hours under the condition of pH 6.5.

[0037] b. Adjust the pH of the hydrolyzed liquid to 9, put it in an ultrasonic cleaner, adjust the ultrasonic temperature to 80°C, adjust the u...

Embodiment 3

[0040] (1) Drying of lotus root joints: Wash and dry the fresh lotus joints until the water content is less than or equal to 7%, then crush them, pass through a 40-mesh sieve, and then adjust the material moisture of lotus joint powder to 14%.

[0041] (2) Extrusion and puffing: DS32-II twin-screw extrusion puffing machine is used for extrusion treatment, the extrusion temperature is 140°C, and the screw speed is 140r / min.

[0042] (3) Ultrasound-assisted alkaline enzymatic extraction of SDF:

[0043] a. Grind the extruded and expanded lotus root powder, pass through a 40-mesh sieve, then dissolve the lotus root powder in water according to the weight ratio of the lotus root powder and water at 1:25, and add 30% of the weight of the lotus root powder at the same time Or 4 or 5% α-amylase, the temperature is controlled at 60 ° C, and the hydrolysis is carried out at pH 7.5 for 2 hours.

[0044] b. Adjust the pH of the hydrolyzed liquid to 10, put it in an ultrasonic cleaner, a...

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Abstract

The invention discloses a preparation method of a kind of soluble dietary fiber prepared from lotus rhizome nodes. The preparation method comprises following steps: step A, drying lotus rhizome nodes: washing and drying fresh lotus rhizome nodes, grinding, sieving, and adjusting water content; step B, extruding and puffing: carrying out an extruding process with a double screw extruding and puffing machine; step C, extracting soluble dietary fiber by an ultrasonic-assisted alkali-enzyme method: step a, grinding the lotus rhizome node powder, which has been extruded and puffed, then sieving, dissolving the lotus rhizome node powder in water, adding alpha-amylase at the same time, and controlling the temperature in a certain range to carry out hydrolysis reactions; step b, adjusting the pH value of the liquid after hydrolysis, and placing the liquid in an ultrasonic washing machine to extract; step c, adjusting the pH value of the extract obtained in the step b, carrying out a centrifugation treatment, discarding the slag, collecting the supernate, adjusting the pH value of the supernate, adding ethanol to participate, carrying out a centrifugation treatment, filtering, and drying so as to obtain the SDF product. The preparation method has the advantages of easy and practicable method and simple operation, combines the modification through extruding and puffing and extracting method through the ultrasonic-assisted alkali-enzyme together, thus the modification time of SDF is shortened, the extraction rate of SDF is increased, and the processing property and physical and chemical properties of the product are prominently improved.

Description

technical field [0001] The invention belongs to the technical field of food processing, and more specifically relates to a method for preparing soluble dietary fiber from lotus root joints, which uses lotus root waste joints as raw materials, and obtains lotus joints through extrusion modification and ultrasonic-assisted alkaline enzyme extraction. Soluble dietary fiber. Background technique [0002] Lotus root (Neulmho nucifer Gaernt) is also known as Fuyun, Shuizhi, Hibiscus, Junzihua, June Spring Lotus, Lotus Root, etc. Originally produced in India and China, it has a long history and rich planting resources. It is the aquatic vegetable with the largest cultivated area in China. Lotus root is rich in carbohydrates, proteins, vitamins, minerals, tannins, etc. It can be said to be a kind of medicine with high value. Food homologous plants, deeply welcomed by consumers. Lotus root node (Nodusrhizomati Nelumbinis) is the dry rhizome node of lotus, also known as light root n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23L1/308A23L33/21
Inventor 李洁赵春梅王清章严守雷
Owner HUAZHONG AGRI UNIV