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New method for producing oxidized starch in alkali-free homogeneous phase way

A technology of oxidized starch and starch, which is applied in the field of alkali-free homogeneous production of oxidized starch, can solve the problems of uneven mixing of oxidized starch, reduce viscosity and retrogradation value, and achieve the effect of solving uneven mixing

Inactive Publication Date: 2012-01-04
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problems to be solved in the present invention are: solve the problem of uneven mixing of oxidized starch prepared by dry method; improve the dissolution index of oxidized starch produced by dry method, reduce viscosity and retrogradation value; make the production process of oxidized starch low in energy consumption, uniform in reaction, No waste, high efficiency, continuous

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Calculate the mass of 3.9kg of water required to adjust the water content of starch to 34% (w / w); preheat the extruder to the specified temperature (120°C); weigh 9.14g FeSO 4 ·7H 2 O(FeSO 4 Addition is 0.05%) and 30% hydrogen peroxide 250g, FeSO 4 ·7H 2 O and 30% hydrogen peroxide are each dissolved and diluted with 1.95kg of water. Combine starch with FeSO in a blender 4 ·7H 2 The O solution and hydrogen peroxide are fully mixed evenly, and the mixed raw materials are added to the hopper of the extrusion extruder, and the screw speed is adjusted to 100rpm, and the materials are evenly fed to carry out extrusion extrusion. The above-mentioned extruded product is ventilated and dried at 80° C. until the moisture content is 11% to 14% (w / w), and pulverized to obtain the oxidized starch product. The indicators measured are: carboxyl content 0.781% (w / w); carbonyl content 0.359% (w / w); solubility index 97.31% (w / w); retrograde value (4°C, 3 days) 6.26, peak viscosity...

Embodiment 2

[0017] Calculate the mass 2.75kg of water needed when the water content of starch is adjusted to 28.5% (w / w); the extruder is preheated to the specified temperature (140°C); weigh 5.49g FeSO 4 ·7H 2 O(FeSO 4 Addition is 0.03%) and 30% hydrogen peroxide 300g, FeSO 4 .7H 2 O and 30% hydrogen peroxide are each dissolved and diluted with 1.375kg of water, and starch and FeSO are mixed in a mixer 4 ·7H 2 O and hydrogen peroxide are fully mixed evenly, and then the mixed raw materials are added to the hopper of the extrusion extruder, and the screw speed is adjusted to 30rpm, and the materials are uniformly fed for extrusion. Air-dry the above extrudate at 60°C for 12 hours and pulverize to obtain the oxidized starch product. The indicators measured are: carboxyl content 0.856% (w / w); carbonyl content 0.448% (w / w); solubility index 97.54% (w / w); retrograde value (4°C, 3 days) 6.51; peak viscosity (10%, w / w) was 5.92cp, and the viscosity disintegration value (95°C, 80min) was 0...

Embodiment 3

[0019] The mass of water required to adjust the water content of starch to 22.7% (w / w) is calculated to be 1.7kg; the extruder is preheated to a specified temperature (160° C.). Weigh 600 g of sodium hypochlorite (available chlorine is 10%, w / w), and dilute it with 0.85 kg of water. Mix the starch and sodium hypochlorite dilution evenly in the mixer, add the mixed raw materials into the hopper of the extrusion extruder, adjust the screw speed to 200rpm, feed the materials evenly, and extrude the above extrudates at 40°C Ventilated and dried for 24 hours, crushed to obtain the oxidized starch product. The indicators measured are: carboxyl content 0.563% (w / w); carbonyl content 0.478% (w / w); solubility index 97.71% (w / w); retrograde value (4°C, 3 days) 7.55; peak viscosity (10%, w / w) was 5.01cp, and the viscosity disintegration value (95°C, 80min) was 0.0014cp.

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Abstract

The invention relates to a new method for producing oxidized starch in an alkali-free homogeneous phase way. The method comprises the following steps of: uniformly mixing starch and solution of oxidant and solution of catalyst in a stirring machine; adding the uniformly-mixed raw materials into a hopper of an extrusion bulking machine, adjusting the rotating speed of a screw to be 5 to 800 rpm, uniformly feeding the materials and performing extrusion; and drying the extrudate at the temperature of between 30 and 105 DEG C until the moisture content is 11 to 14 percent (w / w), and crushing to obtain the oxidized starch. The method solves the problem that materials are not uniformly mixed when the oxidized starch is prepared by a dry method and further solves the problems that due to high content of SO42<->, waste water is difficult to treat when the oxidized starch is prepared by a wet method, and materials are not uniformly mixed when the oxidized starch is prepared by a dry method, and the like. The new method for producing the oxidized starch in the alkali-free homogeneous phase way has the advantages of low energy consumption, high efficiency, continuity, homogeneous phase, and environmental protection, simple process and easy popularization and application.

Description

(1) Technical field [0001] The present invention is a low-energy, high-efficiency, continuous, homogeneous, environmentally friendly, and simple process oxidized starch production method, which is invented to solve the problems of uneven mixing and insufficient reaction in the dry preparation of oxidized starch. (2) Background technology [0002] Starch is a natural high-molecular carbohydrate and an abundant renewable industrial raw material. There are many hydroxyl groups on starch molecules, which can absorb water and swell to gelatinize under appropriate temperature conditions. Starch has certain viscosity and cohesive force, and is widely used in industry. However, native native starch affects its application effect due to its structural and performance defects. Oxidized starch is one of the main varieties of modified starch. Compared with native starch, oxidized starch has the advantages of good fluidity, high viscosity stability, strong permeability, and good cohesi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/18
Inventor 董海洲代养勇侯汉学刘传富王兆升
Owner SHANDONG AGRICULTURAL UNIVERSITY
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