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A kind of method for preparing V-type cold water soluble starch by alcohol-water extrusion

A starch and cold water technology, applied in the field of food processing, can solve the problems of harsh reaction conditions, low starch concentration, waste water generation, etc., and achieve the effects of reducing energy consumption and production costs, increasing the viscosity of cold paste, and increasing surface area and porosity.

Active Publication Date: 2021-08-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction conditions required by the high temperature and high pressure alcohol method are harsh and the starch concentration of the reaction is low, and a large amount of ethanol is required to be washed repeatedly to complete the reaction; the reaction conditions of the ethanol alkali method are relatively mild, but in addition to the low concentration of the starch to be reacted, the washing process requires a large amount of organic reagents In addition, the reaction process needs to add alkali, the reaction needs to be neutralized with acid, and a large amount of waste water is generated. Therefore, it is urgent to study and explore a high-efficiency, low-cost and environmentally friendly cold-water soluble starch production process.

Method used

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  • A kind of method for preparing V-type cold water soluble starch by alcohol-water extrusion
  • A kind of method for preparing V-type cold water soluble starch by alcohol-water extrusion

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Prepare 40% ethanol solution, weigh a certain amount of cornstarch and place it in a container, add ethanol solution according to the ratio of starch: ethanol solution=1:0.7, stir and send it into an extruder for extrusion processing. The operating parameters of the machine are: the heating temperature of the premixing zone is 50°C, the temperature of the gelatinization zone is 95°C, the temperature of the forming zone is 60°C, and the rotation speed of the extruder is 150r / min. The extrudate is in the form of a strip, which is cut into a sheet with a thickness of 0.1 cm and a side length of 5 cm by a sheeting roller. The sheet is dried in a microwave vacuum oven at 40°C for 30 minutes, then cooled and placed in a cyclone ultramicro Grinding in a pulverizer (with a mesh size of 1.0mm) to obtain V-type cold water soluble starch. It can quickly disperse into a paste in water at 25°C, with a cold paste viscosity of 5561cP, while alcohol-free extruded starch and native star...

Embodiment 2

[0023] Prepare a 3% ethanol solution, weigh a certain amount of potato starch and place it in a container, add the ethanol solution according to the ratio of starch: ethanol solution=1:1.1, stir and send it into an extruder for extrusion processing. The operating parameters of the machine are: the heating temperature of the premixing zone is 50°C, the temperature of the gelatinization zone is 120°C, the temperature of the forming zone is 60°C, and the speed of the extruder is 70r / min. The extrudate is in the form of a strip, which is cut into a sheet with a thickness of 0.1 cm and a side length of 5 cm by a sheeting roller. The sheet is dried in a microwave vacuum oven at 60°C for 5 minutes, then cooled and placed in a cyclone ultramicro Grinding in a pulverizer (mesh size of 1.0 mm) yields V-type cold water soluble starch, which can be quickly dispersed into a paste in water at 25°C, with a cold paste viscosity of 4876cP and a relative crystallinity of 7.88%.

Embodiment 3

[0025] Prepare an 80% ethanol solution, weigh a certain amount of cornstarch and potato starch and place them in a container at a mass ratio of 1:1, add the ethanol solution according to the ratio of starch:ethanol solution=1:0.3, stir evenly and send it into the extrusion Extrusion processing is carried out in the press, and the operating parameters of the extruder are: the heating temperature of the premixing zone is 50°C, the temperature of the gelatinization zone is 70°C, the temperature of the forming zone is 60°C, and the speed of the extruder is 110r / min. The extrudate is in the form of a strip, which is cut by a sheeting roller to obtain a sheet with a thickness of 0.1 cm and a side length of 5 cm. The sheet is dried in a microwave vacuum oven at 50°C for 15 minutes, then cooled and placed in a cyclone ultramicro Grinding in a pulverizer (with a screen size of 1.0 mm) yielded V-type cold water-soluble starch, which can be quickly dispersed into a paste in water at 25°C,...

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Abstract

The application of the present invention discloses a method for preparing V-type cold-water soluble starch by alcohol-water extrusion, which belongs to the technical field of food processing. The V-type cold-water-soluble starch can quickly swell into a paste in cold water to produce a certain viscosity, which is convenient to use, and The preparation process is green and efficient. The specific method is: first prepare a certain concentration of ethanol solution, add a certain proportion of starch to form starch milk, and then directly send the prepared starch milk into the extruder for extrusion treatment to obtain strips. The extrudate, the strip-shaped extrudate is pressed into tablets, roll cut to obtain thin slices, and placed in a microwave vacuum drying oven to dry, then cooled and placed in a cyclone ultrafine pulverizer for pulverization to obtain V-type cold water Soluble starch. The invention solves the problem that pregelatinized starch prepared from high-concentration starch is not easy to rehydrate, and the viscosity is too low after regelatinization, and the preparation process has low energy consumption and no waste water is generated.

Description

technical field [0001] The invention belongs to the technical field of food processing, and in particular relates to a method for preparing V-type cold-water-soluble starch by extrusion with alcohol and water. Background technique [0002] Starch is generally heated and gelatinized before use. Cold water soluble starch can avoid the trouble of heating and gelatinizing, and broaden the application range of starch. Cold water soluble starch is divided into two types: pregelatinized starch and granular V-type starch. At present, the common methods for industrial preparation of pregelatinized starch are: drum drying method, spray drying method, and extrusion method. The concentration of starch milk required by the drum drying method is generally controlled at 20-40% (moisture content 60-80%), and the starch milk needs to be evenly distributed on the heated drum to form a thin layer and be gelatinized at the same time. When the moisture content reaches about 5%, it is scraped of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B30/12
CPCC08B30/12C08B30/14C08L3/02C08B30/10C08B30/06C08B30/08
Inventor 周星孟婷婷金征宇王韧赵建伟王金鹏焦爱权徐学明
Owner JIANGNAN UNIV