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Microwave-assisted method for synthesis of oxidized corn starch from composite oxidant and composition

A technology of composite oxidant and corn starch, which is applied in the field of microwave-assisted composite oxidant synthesis of oxidized corn starch and the field of synthesis, can solve the problems of unsuitable mixing of reaction materials, high viscosity of reaction system, poor reaction effect, etc., and achieve transparency and freeze-thaw stability reduction, good viscoelasticity and plasticity, and less waste water

Inactive Publication Date: 2014-04-30
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscosity of the reaction system of this method is high, it is difficult to stir, the reaction materials should not be mixed evenly, and the reaction effect is poor.

Method used

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  • Microwave-assisted method for synthesis of oxidized corn starch from composite oxidant and composition
  • Microwave-assisted method for synthesis of oxidized corn starch from composite oxidant and composition
  • Microwave-assisted method for synthesis of oxidized corn starch from composite oxidant and composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The method for the synthesis of oxidized cornstarch by microwave-assisted compound oxidant in this example comprises the following steps:

[0018] a, cornstarch is mixed with starch emulsion, and the concentration of starch emulsion is 35%;

[0019] b, adjust the pH value of the reaction system with hydrochloric acid, the pH value is 3.0~5.0;

[0020] c. Transfer the starch emulsion through steps a and b into a three-necked flask, and add 0.2% FeSO by mass fraction 4 Catalyst, and constant pressure slowly drop composite oxidant 6%;

[0021] d. React the above-mentioned starch emulsion under microwave radiation at a constant temperature for 15 minutes, and set the reaction temperature to 45°C-55°C; add 8mL-15mL of 10% sodium sulfite aqueous solution to terminate the reaction;

[0022] e. Wash the oxidized starch emulsion through step d with distilled water and ultrapure water successively, and suction filter after each washing. After washing several times, the filtrate...

Embodiment 2

[0024] The method for the synthesis of oxidized cornstarch by microwave-assisted compound oxidant in this example comprises the following steps:

[0025] a, cornstarch is mixed with starch emulsion, and the concentration of starch emulsion is 40%;

[0026] b. Adjust the pH value of the reaction system with hydrochloric acid, and the pH value is 3.0-5.0.

[0027] c. Transfer the starch emulsion through steps a and b into a three-necked flask, add FeSO 4 Catalyst 0.3%, and 8% composite oxidant was slowly added dropwise under constant pressure.

[0028] d. React the above-mentioned starch emulsion under microwave radiation at a constant temperature for 18 minutes, and set the reaction temperature to 45°C-55°C; add 8mL-15mL of 10% sodium sulfite aqueous solution to terminate the reaction;

[0029] e. Wash the oxidized starch emulsion through step d with distilled water and ultrapure water successively, and suction filter after each washing. After washing several times, the filtr...

Embodiment 3

[0031] The method for the synthesis of oxidized cornstarch by microwave-assisted compound oxidant in this example comprises the following steps:

[0032] a, cornstarch is mixed with starch emulsion, and the concentration of starch emulsion is 45%;

[0033] b, adjust the pH value of the reaction system with hydrochloric acid, the pH value is 3.0~5.0;

[0034] c. Transfer the starch emulsion through steps a and b into a three-necked flask, and add 0.4% FeSO by mass fraction 4 catalyst, and slowly add 10% of composite oxidant dropwise at constant pressure;

[0035] d. React the above-mentioned starch emulsion under microwave radiation at a constant temperature for 21 minutes, and set the reaction temperature to 45°C-55°C; add 8mL-15mL of 10% sodium sulfite aqueous solution to terminate the reaction;

[0036] e. Wash the oxidized starch emulsion in step d with distilled water and ultrapure water successively, and suction filter after each washing. After washing several times, th...

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Abstract

The invention relates to a microwave-assisted method for synthesis of oxidized corn starch from a composite oxidant and a composition. The method includes the steps of: preparing corn starch into a starch emulsion, using hydrochloric acid to adjust the pH value to a set value; then transferring the starch emulsion into a three-neck flask, adding an FeSO4 catalyst, and slowly adding the composite oxidant dropwise under a constant pressure to undergo constant temperature reaction under microwave irradiation, then adding a sodium sulfite aqueous solution to terminate reaction; conducting washing with distilled water and ultra-pure water in order several times, and carrying out suction filtration after each washing, subjecting the filtrate to detection by KSCN, HNO3, BaCl2 and AgNO3 in order until the system is free of Fe<2+>, SO3<2->, SO4<2-> and Cl<->; and carrying out pressure reduced drying and crushing. The method is employed to synthesize the oxidized corn starch, by means of microwave-assisted synthesis, the shortest reaction time can be 21min, the needed starch emulsion has a higher concentration, and less wastewater is generated.

Description

technical field [0001] The invention relates to a synthesis method and composition of oxidized cornstarch, in particular to a method and composition for synthesizing oxidized cornstarch with microwave-assisted composite oxidant. Background technique [0002] Starch is the most important carbohydrate in the human diet and the main source of energy required by the human body. However, due to the insolubility of raw starch in cold water, poor thermal stability of starch paste, poor shear resistance, easy dehydration after cooling, aging, poor film-forming properties, lack of water resistance and poor emulsification ability, etc., it cannot meet the needs of various fields to the greatest extent. Requirements for starch properties. At present, most of the synthesis of oxidized starch is under alkaline conditions, and a single oxidant is mostly used. The reaction system of this method has a high viscosity and is difficult to stir. The reaction materials should not be mixed even...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/18
Inventor 史美丽李玉秀
Owner QINGDAO AGRI UNIV
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