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Method for preparing sweet potato amylodextrin by acid-alcohol medium

A technology for starch dextrin and sweet potato starch is applied in the field of preparing sweet potato starch dextrin by alcohol medium acid method, which can solve the problems of long reaction time and the like, and achieve the effects of short reaction time, simple and practical process, and low investment.

Inactive Publication Date: 2009-12-30
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid modification of starch must be carried out below the gelatinization temperature of starch, and the gelatinization temperature in aqueous medium generally does not exceed 60°C, which causes the shortcoming of long reaction time of sweet potato aqueous acid hydrolysis process, which affects its popularization and application

Method used

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  • Method for preparing sweet potato amylodextrin by acid-alcohol medium
  • Method for preparing sweet potato amylodextrin by acid-alcohol medium
  • Method for preparing sweet potato amylodextrin by acid-alcohol medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Sweet potato starch dextrin alcohol medium acid hydrolysis process:

[0026] 13~15 grams of sweet potato starch → put into 75~80ml ethanol solution and hydrolyze with hydrochloric acid with a concentration of 2~6% → ​​heat to the boiling point of 79~81°C, reflux and continuously stir, after hydrolysis, filter and separate starch maltodextrin, disperse in Neutralize to pH=7 with 10% NaOH in distilled water, dehydrate, wash with distilled water 7 times, dehydrate with ethanol 4 times, and dry at 40-50°C for 6 hours to prepare sweet potato starch dextrin.

Embodiment 2

[0028] Determination of water holding capacity of sweet potato starch dextrin:

[0029] The water holding capacity of 10% and 30% starch dextrin aqueous solution samples was determined by centrifugation. The sample was weighed and dispersed in distilled water at 20°C according to the specified concentration, and centrifuged at 7500r / min for 15min. Remove the water from the upper part of the tube and weigh it. The water holding capacity can be calculated by the following formula:

[0030] Water holding capacity = (the amount of water in the dispersed sample - the amount of water removed from the upper part of the centrifuge tube) / the amount of starch dextrin

Embodiment 3

[0032] Determination of hygroscopicity of sweet potato starch dextrin:

[0033] Take about 2.5g of starch dextrin sample, put it in a desiccator, place it at 20°C for 1.5 days at different relative humidity, use sulfuric acid solutions of different concentrations to adjust the humidity of the closed environment, and measure the weight change of starch dextrin sample Hygroscopicity.

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Abstract

The invention discloses a method for preparing sweet potato amylodextrin by acid-alcohol medium, which comprises the steps of: placing sweet potato starch into ethanol solution; using hydrochloric acid to hydrolyze the sweet potato starch; heating the solution to the boiling point; refluxing and continuously stirring the solution; filtering the solution after the hydrolysis; separating out starch maltodextrin, and dispersing the starch maltodextrin into distilled water; neutralizing the obtained solution by NaOH, dehydrating the obtained solution, and washing the obtained solution by the distilled water; and obtaining the sweet potato amylodextrin through the dehydration by ethanol and drying. An obtained product has larger water retention property than native starch and has stronger hydroscopic property, and the value of the viscosity of acidolysis amylodextrin is reduced compared with the native starch. The method takes the sweet potato starch as a raw material, uses acids and alcohols with different concentrations to hydrolyze to prepare the amylodextrin under the condition that the temperature is higher than the gelatinization temperature of aqueous medium, has the advantages of shorter reaction time, simple and practical process, and low needed investment during the production, and has the technology which is suitable to be widely popularized.

Description

technical field [0001] The invention belongs to the field of chemical food, in particular to a method for preparing sweet potato starch dextrin by an alcohol-medium acid method. Background technique [0002] Starch is a renewable resource with abundant sources and is the product of plant photosynthesis. Starch widely exists in the seeds, roots, stems and other tissues of many plants, especially in various plants such as rice, wheat, and corn. Starch is also stored in large quantities in the tissues of potatoes, cassava, and sweet potatoes. Due to the wide source of starch raw materials, there are many types, the output is abundant, and it is cheap. Research and development of starch chemicals is extremely valuable. In addition to being widely used in food, starch and its deep-processed products are also used in industries such as textiles, medicine, feed, oil drilling, casting, and architectural coatings, becoming indispensable raw materials for industrial and agricultura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L1/09A23L1/216A23L1/28A23L29/30
Inventor 郝晓敏谷长生宋文东颜建斌
Owner GUANGDONG OCEAN UNIVERSITY
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