Detecting method for residual glyoxal content in ethoxyl/hydroxypropyl methyl cellulose

A technology of hydroxypropyl methylcellulose and detection method, which is applied in the measurement of color/spectral characteristics, measurement device, preparation of samples for testing, etc., to achieve the effects of high measurement accuracy and improved environmental protection quality

Inactive Publication Date: 2018-12-11
CHONGQING PENGKAI FINE CHEM CO LTD
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Problems solved by technology

[0005] In the prior art, there is no specific method for detecting the residual glyoxal content in hydroxyethyl / hydroxypropyl methylcellulose, but the excessive content of glyoxal is harmful to the body. In order to ensure that the product is more environmentally friendly, it is necessary to Detection of Residual Glyoxal Content in Hydroxyethyl / Hydroxypropyl Methylcellulose

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  • Detecting method for residual glyoxal content in ethoxyl/hydroxypropyl methyl cellulose
  • Detecting method for residual glyoxal content in ethoxyl/hydroxypropyl methyl cellulose
  • Detecting method for residual glyoxal content in ethoxyl/hydroxypropyl methyl cellulose

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[0025] In order to describe in detail the technical content, structural features, achieved objectives and effects of the present invention, the following will be described in detail in conjunction with the embodiments.

[0026] A detection method for residual glyoxal content in hydroxyethyl / hydroxypropyl methylcellulose, comprising the steps:

[0027] a. Preparation of phenol reagent solution: Weigh 0.200 g of phenol reagent, add 40.0 g of glacial acetic acid, dilute to 50 ml with deionized water, and store in the refrigerator for later use;

[0028] b. Preparation of 5mg / L glyoxal standard solution: weigh 1.25g glyoxal solution with a mass fraction of 40%, accurate to 0.001g, dilute to 1L with deionized water, then pipette 10.00ml solution, and use Dilute to 1L with deionized water, set aside;

[0029] c. Weigh 1.0 g of hydroxyethyl / hydroxypropyl methylcellulose sample, accurate to 0.0001 g, into a 100 ml beaker, add 50 ml of tetrahydrofuran, and stir at a low speed to disso...

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Abstract

The invention discloses a detecting method for residual glyoxal content in ethoxyl/hydroxypropyl methyl cellulose. The method comprises the following steps: a, preparing phenol reagent solution; b, preparing glyoxal standard solution for future use; c, weighing a sample, adding tetrahydrofuran, and stirring in a low speed; d, filtering through a filter membrane, for future use; e, taking and transferring filtrate in the step d to a reaction flask, adding deionized water and phenol reagent solution, uniformly mixing, and testing absorbancy of the above testing solution through a spectrophotometer, wherein a wave length is 405 nm; f, drawing a standard curve; and g, calculating the residual glyoxal content in the ethoxyl/hydroxypropyl methyl cellulose through a classical formula. The methodcan be used for effectively and rapidly detecting the residual glyoxal content in the ethoxyl/hydroxypropyl methyl cellulose, effectively detecting aldehydes materials in a product harmful to a humanbody, and improving environmental production quality of the product.

Description

technical field [0001] The invention relates to a detection method for glyoxal content, in particular to a detection method for residual glyoxal content in hydroxyethyl / hydroxypropyl methylcellulose. Background technique [0002] The hydroxyethyl / hydroxypropyl methylcellulose with delayed dissolution is cross-linked by adding glyoxal during the production process, and the surface is treated to make the cellulose ether have good dispersibility in cold water. [0003] However, in the actual production process, the amount of glyoxal added is not easy to control. If the added amount is insufficient, the dispersibility of cellulose ether in cold water is not good; The cost of production has an impact on the health of the body, as well as on the stability of product quality. [0004] Therefore, by testing the amount of residual glyoxal in cellulose ether to control the amount of glyoxal added in the production process, this can not only reduce production costs, reduce the residua...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28G01N1/34G01N1/38
CPCG01N1/28G01N1/34G01N1/38G01N21/31G01N2001/386
Inventor 王聪颖陈挺
Owner CHONGQING PENGKAI FINE CHEM CO LTD
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