Method for testing substituting degree of carboxymethylcellulose potassium

A technology of carboxymethyl cellulose and testing method, applied in the field of substitution degree testing of potassium carboxymethyl cellulose, can solve the problems of poor confidence, limited use of potassium carboxymethyl cellulose, long time, etc., and can reach a wide range , The effect of less reagent type and dosage, and simple operation

Inactive Publication Date: 2015-04-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the carboxymethylcellulose potassium molecule, because K and the carboxyl group are not combined according to the stoichiometric ratio of 1:1, as the current assay method using sodium carboxymethylcellulose, the degree of substitution of the measured cellulose potassium has a long time, Accuracy, variance, poor confidence and other issues severely limit the use of carboxymethylcellulose potassium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first step is to accurately weigh 1.0000g (accurate to 0.0002g) carboxymethylcellulose potassium sample (purity greater than 99.5%, ashing method substitution degree 0.30), burn, and dissolve the residue in 90ml of high-purity water to obtain a uniform Dilute the solution to volume in a 100mL volumetric flask;

[0023] The second step tests the mass percent concentration C of the solution potassium ion obtained in the first step with an ion chromatograph, and the average value for three times is 6.24%, calculated according to the formula:

[0024] DS=162*C / (39-96*C)=0.30,

[0025] The potassium mass percentage content and substitution degree (DS) of carboxymethyl cellulose potassium are obtained. The data precision and accuracy are high and stable. At the same time, only high-purity water is used, no other reagents, and other methods are used to complete the determination.

Embodiment 2

[0027] The first step is to accurately weigh 1.0000g (accurate to 0.0002g) carboxymethylcellulose potassium sample (purity greater than 99.5%, degree of substitution by ashing method 1.10), burn, and dissolve the residue in high-purity water to obtain a uniform solution in Dilute to volume in a 100mL volumetric flask;

[0028] The second step tests the mass percentage concentration C of the solution potassium ion obtained in the first step with an ion chromatograph, and the average value for three times is 16.03%, calculated according to the formula:

[0029] DS=162*C / (39-96*C)=1.10,

[0030] The potassium mass percentage content and substitution degree (DS) of carboxymethyl cellulose potassium are obtained. The data precision and accuracy are high and stable. At the same time, only high-purity water is used, no other reagents, and other methods are used to complete the determination.

Embodiment 3

[0032] The first step is to accurately weigh 1.0000g (accurate to 0.0002g) carboxymethylcellulose potassium sample (purity greater than 99.5%, ashing method substitution degree 0.45), burn, and dissolve the residue in high-purity water to obtain a uniform solution in 100mL Constant volume in the volumetric flask;

[0033] The second step tests the mass percent concentration C of the solution potassium ion obtained in the first step with an ion chromatograph, and the average value for three times is 8.58%, calculated according to the formula:

[0034] DS=162*C / (39-96*C)=0.45,

[0035] The potassium mass percentage content and substitution degree (DS) of carboxymethyl cellulose potassium are obtained. The data precision and accuracy are high and stable. At the same time, only high-purity water is used, no other reagents, and other methods are used to complete the determination.

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Abstract

The invention discloses a method for testing the substituting degree of carboxymethylcellulose potassium. The method comprises the following steps: weighing a certain amount of a carboxymethylcellulose potassium sample at first, firing, preparing a solution with a certain concentration, and testing by using a modern testing instrument. By adopting the method disclosed by the invention, the substituting degree of carboxymethylcellulose potassium can be obtained, and the method has the characteristics of simplicity and convenience in operation, wide testing range and small data error.

Description

technical field [0001] The invention relates to the technical field of testing the degree of substitution of carboxymethyl cellulose potassium, in particular to a method for testing the degree of substitution of carboxymethyl cellulose potassium. Background technique [0002] The national standard food additives GB2760-2007 lists carboxymethylcellulose sodium (CMC) as a list of additives that can be used in appropriate amounts in various foods according to production needs (A3, 53), and are widely used in beverages, dairy products, and ice cream , soy sauce, jelly, jam, instant noodles and other food industries. This means that in food production, CMC can be added in large quantities. However, studies have shown that diseases such as diabetes, hypertension, and cardiovascular disease are closely related to excessive intake of sodium ions. [0003] Reduce the total amount of sodium ions ingested by the human body. On the one hand, to appropriately reduce the intake of sodi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 叶君熊犍
Owner SOUTH CHINA UNIV OF TECH
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