Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of sweet potato carboxymethyl modified starch

A technology of modified starch and sweet potato starch, which is applied in the field of preparation of sweet potato carboxymethyl modified starch, can solve the problems of low efficiency, low degree of substitution, long heating time, etc., achieve high degree of product substitution, increase degree of substitution, and increase production efficiency effect

Active Publication Date: 2013-01-23
HUNAN AGRICULTURAL UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing sweet potato carboxymethyl modified starch in view of the problems of long heating time, low efficiency and low degree of substitution in the modification process of sweet potato starch in the prior art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] After adding 70kg NaOH in 100kg sweet potato starch, dissolve with the ethanol solution of 1000L 78% mass concentration, microwave treatment 25min (microwave power is 320W) after fully stirring, so that starch is alkalized, then add 60kg chloroacetic acid, microwave treatment 65min ( Microwave power is 320W), then insert high-voltage pulsed electric field device (electric field strength is 22KV / cm 2 , the frequency is 8000Hz, the number of pulses is 10-12) and treated for 5s to etherify the starch. After the solution is cooled to room temperature, use 40% mass concentration of glacial acetic acid solution to neutralize and adjust the pH value to 6.8, and then use 100 mesh filter Cloth filtration, rinse the filter residue with 82% mass concentration ethanol solution, and place it in a vacuum drying oven at 76°C to dry to constant weight.

Embodiment 2

[0014] After adding 71kg NaOH in 100kg sweet potato starch, dissolve with the ethanol solution of 1000L 80% mass concentration, microwave treatment 30min (microwave power is 300W) after fully stirring, so that starch is alkalized, then add 61kg chloroacetic acid, microwave treatment 70min ( Microwave power is 300W), then insert high-voltage pulsed electric field device (electric field strength is 25KV / cm 2 , the frequency is 8000Hz, the number of pulses is 10-12) and treated for 6s to etherify the starch. After the solution is cooled to room temperature, use 45% mass concentration of citric acid solution to neutralize and adjust the pH value to 7.0, and then use 100 mesh filter Cloth filter, rinse the filter residue with 85% mass concentration ethanol solution, and dry it in a vacuum drying oven at 78°C until constant weight.

Embodiment 3

[0016] After adding 69kg NaOH in 100kg sweet potato starch, dissolve with the ethanol solution of 1000L 75% mass concentration, microwave treatment 20min (microwave power is 350W) after fully stirring, so that starch is alkalized, then add 59kg chloroacetic acid, microwave treatment 60min ( Microwave power is 350W), then insert high-voltage pulsed electric field device (electric field strength is 20KV / cm 2 , the frequency is 8000Hz, the number of pulses is 10-12) and treated for 5s to etherify the starch. After the solution is cooled to room temperature, use 30% mass concentration of malic acid solution to neutralize and adjust the pH value to 6.5, and then use 100 mesh filter Cloth filter, rinse the filter residue with 80% mass concentration ethanol solution, and place it in a vacuum drying oven at 75°C to dry to constant weight.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A preparation method of a sweet potato carboxymethyl modified starch. The method comprises steps of: adding NaOH into sweet potato starch; dissolving by an ethanol solution; stirring thoroughly, and then carting out microwave treatment to alkalify the starch; adding chloroacetic acid and carrying out microwave treatment; treating the starch by high voltage pulse electric field for etherification;cooling the solution to room temperature; regulating a pH value; filtering; rinsing the filter residue by alcohol solution and carrying out vacuum drying till a constant weight. The method of the invention employs microwave treatment to replace traditional water bath heating in sweet potato starch alkalization and etherification processes, so as to greatly improves production efficiency and savesthe cost; meanwhile, high voltage pulsed electric field (PEF) is utilized in the sweet potato starch etherification process to effectively improve the degree of substitution (DS) of carboxymethyl starch to 0.94. The method is simple and convenient, has high in degree of substitution, and provides new way for deep processing and utilization of sweet potato starch.

Description

Technical field: [0001] The invention relates to a preparation method of sweet potato carboxymethyl modified starch. Background technique: [0002] Sweet potato starch is a natural renewable resource. my country is a big producer of sweet potato starch. It is cheap, easy to gelatinize, and has high chemical reactivity. It is suitable for the preparation of modified starch. The carboxymethylation of starch is the process of etherifying starch to modify starch. The modified carboxymethyl starch (CMS) has the inherent properties of carboxyl groups, such as: chelation, ion exchange, flocculation of polyanions Function and acidic function, also has some solution properties, such as: thickening, gelatinization, water absorption, adhesion and film-forming properties, can be widely used in medicine, food, textile, printing and dyeing, papermaking, oil drilling and other fields, It is a modified starch product with great market prospect. [0003] The research on carboxymethyl starc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/12
Inventor 秦丹胡亚平李罗明
Owner HUNAN AGRICULTURAL UNIV