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Method for measuring molecular weight of guar gum based on headspace gas chromatography

The technology of headspace gas chromatography and guar gum is applied in the field of molecular weight determination of macromolecular organic compounds, which can solve the problems of high price, inconvenient determination, and difficulty in finding standard samples, and achieves the effect of less sample consumption.

Active Publication Date: 2018-04-20
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Gel permeation chromatography, using GPC gel chromatograph to measure molecular weight and relative viscosity is faster and faster, but it needs to use a standard product similar to the structure type of the substance to be tested to make a standard curve first, and some standard samples are not easy to find or even have a similar price Expensive, which brings a lot of inconvenience to the determination

Method used

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  • Method for measuring molecular weight of guar gum based on headspace gas chromatography
  • Method for measuring molecular weight of guar gum based on headspace gas chromatography
  • Method for measuring molecular weight of guar gum based on headspace gas chromatography

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Embodiment

[0039] Sample preparation: Accurately weigh five kinds of guar gum samples with known viscosity-average molecular weight and guar gum samples (0.68-0.73g) with molecular weight to be measured, put them into 100ml conical flasks respectively, and add 1.2ml Dehydrated alcohol makes guar gum disperse evenly, then in conical flask, add concentration respectively and be the n-butanol solution of 200ppm to guar gum solution quality be 60g, add magnetic stirring bar, conical flask is put into constant temperature water bath (25 ±0.5°C), stirred with a magnetic stirrer for 2 hours.

[0040] Accurately weigh 10g of guar gum solution into the headspace bottle, and seal it with a gland;

[0041] Establish a standard curve: put the headspace bottle containing the standard guar gum sample with known viscosity-average molecular weight in the headspace sampler oven, set the equilibrium temperature to 40°C, the sample equilibrium time to 5min, and the carrier gas equilibrium time in the heads...

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Abstract

The invention discloses a method for measuring molecular weight of guar gum based on headspace gas chromatography. The method comprises the steps: preparation of samples, establishment of standard curves, detection of samples, calculation of results and the like. Firstly, when the molecular weight of the guar gum is detected by adopting the method, more samples are not needed, the using amount ofthe samples is less, and standard samples with similar structures are not needed; secondly, more operations on guar gum solutions are also not needed in a determination process, a certain quantity ofguar gum solutions are only weighed and put behind a headspace bottle so as to continuously perform headspace gas chromatography for three times, and then chromatographic signal values are substitutedinto the standard curves which are built in advance so that the molecular weight of the guar gum is worked out; therefore, the determination of the molecular weight of the guar gum is carried out byadopting the method, so that operation processes can be simplified, and the testing time is greatly shortened; thus, a detection result can be worked out instantly, and the result is objective and accurate.

Description

technical field [0001] The invention relates to the technical field of molecular weight determination of macromolecular organic matter, in particular to a method for measuring the molecular weight of guar gum based on headspace gas chromatography. Background technique [0002] Headspace gas chromatography, also known as headspace gas chromatography. Headspace gas chromatography uses the principle that after the volatile components in the liquid (solid) body reach equilibrium in a closed constant temperature system, the ratio of the volatile components in the gas phase and the liquid (solid) phase is constant, and the vapor in the upper part of the liquid (solid) after equilibrium is analyzed. Perform gas chromatographic analysis. It can also use the "repulsion" or "adsorption" effect of the measured components on the volatile tracer in the sample to obtain the peak area of ​​the gas phase components of the volatile substances above the sample, and establish the peak area by...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/68
CPCG01N30/02G01N30/06G01N30/68
Inventor 刘梦珍万小芳柴欣生林科
Owner SOUTH CHINA UNIV OF TECH
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