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Method for determining degree of substitution of sodium carboxymethylcellulose

A technology of sodium carboxymethyl cellulose and purity, which is applied in the field of testing the degree of substitution of sodium carboxymethyl cellulose, which can solve the problems such as the difficulty of grasping the end point of titration and insufficient sensitivity of discoloration, and achieve wide substitution range and data precision And the effect of high accuracy, less types and dosage

Inactive Publication Date: 2015-03-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wash with methanol, air-dry to remove methanol, dry at 105°C for 3 hours, weigh 0.5 g to determine the sulfate ash content, repeat the operation until the ash content is less than 0.5% when it is greater than 0.5%, take 1-1.5 g sample and dissolve it in sodium hydroxide standard solution , use phenolphthalein as indicator, titrate with standard hydrochloric acid, and calculate the degree of substitution DS; the theoretical end point pH value of this method is about 8.2. The end is not easy to grasp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first step is to accurately weigh 1.0000g (accurate to 0.0002g) sodium carboxymethyl cellulose sample (purity greater than 99.5%), the degree of substitution obtained by ashing method is 0.20, burn, the residue is dissolved in high-purity water, and the obtained homogeneous Dilute the solution in a 100mL volumetric flask;

[0029] The second step is to test the mass percent concentration C of the solution sodium ion obtained in the first step with an ion chromatograph, and the average value for three times is 2.59%, calculated according to the formula:

[0030] DS=162*C / (23-80*C)=0.20,

[0031] There was no significant difference between the degree of substitution (DS) of sodium carboxymethyl cellulose and the ashing method. At the same time, only high-purity water is used, without other reagents, and other methods are used to complete the determination of the degree of substitution.

Embodiment 2

[0033] The first step is to accurately weigh 1.0000g (accurate to 0.0002g) sodium carboxymethyl cellulose sample (purity greater than 99.5%), the degree of substitution obtained by ashing method is 1.10, burn, and dissolve the residue in high-purity water. Dilute the solution in a 100mL volumetric flask;

[0034] The second step is to test the percentage concentration C of the solution sodium ion obtained in the first step with an ion chromatograph, and the average value for three times is 10.12%, calculated according to the formula:

[0035] DS=162*C / (23-80*C)=1.10,

[0036] There was no significant difference between the degree of substitution (DS) of sodium carboxymethyl cellulose and the ashing method. At the same time, only high-purity water is used, without other reagents, and other methods are used to complete the determination of the degree of substitution.

Embodiment 3

[0038] The first step is to accurately weigh 1.0000g (accurate to 0.0002g) sodium carboxymethyl cellulose sample (purity greater than 99.5%), the degree of substitution obtained by ashing method is 0.86, burn, the residue is dissolved in high-purity water, and the obtained homogeneous Dilute the solution in a 100mL volumetric flask;

[0039] The second step is to test the percentage concentration C of the solution sodium ion obtained in the first step with an ion chromatograph, and the average value for three times is 8.57%, calculated according to the formula:

[0040] DS=162*C / (23-80*C)=0.86,

[0041] There was no significant difference between the degree of substitution (DS) of sodium carboxymethyl cellulose and the ashing method. At the same time, only high-purity water is used, without other reagents, and other methods are used to complete the determination of the degree of substitution.

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Abstract

The invention discloses a method for determining degree of substitution of sodium carboxymethylcellulose. The method comprises the following steps: firstly, weighing a certain amount of sample; firing; dissolving to prepare a solution; testing sodium ion concentration by using a modern tester; calculating the degree of substitution. The method disclosed by the invention can be used for determining the degree of substitution of sodium carboxymethylcellulose. The method disclosed by the invention has the characteristics that time is saved, the operation is simple and convenient, the determining range is wide, and the data error is small.

Description

technical field [0001] The invention relates to the technical field of testing the degree of substitution of sodium carboxymethyl cellulose, in particular to a method for measuring the degree of substitution of sodium carboxymethyl cellulose. Background technique [0002] Sodium carboxymethyl carboxymethyl cellulose ( CMC ) is an important fine chemical product obtained by the etherification reaction of cellulose and chloroacetic acid under alkaline conditions. The national standard GB2760-2007 lists it as a list of additives that can be used in various foods according to production needs (A3, 53). It is a nutritious, safe and healthy food additive. Used as an additive in food, it has multiple functions such as thickening, suspension, emulsification, stabilization, shape retention, film formation, puffing, antiseptic preservation, acid resistance and health care. Food glue is cheap, so it is widely used in beverages, dairy products, ice cream, soy sauce, jelly, jam, instant...

Claims

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Application Information

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IPC IPC(8): G01N30/96
Inventor 叶君熊犍
Owner SOUTH CHINA UNIV OF TECH
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