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Method for detecting polydimethylsiloxane

The technology of polydimethylsiloxane and dimethylsiloxane is applied in the detection field of polydimethylsiloxane, which can solve the problems of difficulty in quantitative analysis of polydimethylsiloxane and the like, and achieves an obvious social Benefit and economic effects

Active Publication Date: 2011-01-12
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a detection method for polydimethylsiloxane, which is used to measure the content of trace polydimethylsiloxane in food and solve the problem of polydimethylsiloxane. Difficult Quantitative Analysis of Oxane

Method used

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  • Method for detecting polydimethylsiloxane
  • Method for detecting polydimethylsiloxane
  • Method for detecting polydimethylsiloxane

Examples

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Effect test

Embodiment 1

[0034] Embodiment 1: the mensuration of polydimethylsiloxane in fried chicken

[0035] (1) Weigh 10.0g of fried chicken sample, put it in a blender and crush it, use petroleum ether-ethyl acetate (volume ratio 5:1) 50mL, extract by ultrasonic vibration for 3 times, combine the 3 extracts, concentrate and pass Silica gel small column, discard the effluent, rinse with 10mL petroleum ether, discard the eluent to remove grease, then elute with 20mL petroleum ether-ethyl acetate (volume ratio 5:1), collect the eluent, Concentrate to 1.0mL.

[0036] (2) Preparation of standard solution: Accurately weigh 100mg (accurate to 0.1mg) of each polydimethylsiloxane standard product, dissolve it in ethyl acetate in a 100mL volumetric flask and make it to volume. The concentration of the solution is 1g / L , stored in a refrigerator at 4°C, valid for 6 months; standard working solution: absorb the standard stock solution, dilute it step by step with ethyl acetate to obtain 10, 25, 50, 100, 200...

Embodiment 2

[0044] Embodiment 2: the mensuration of polydimethylsiloxane in apple peel

[0045] (1) Take the apple peel, chop it, weigh 5.0g sample, use 25mL of petroleum ether-ethyl acetate (volume ratio 5:1), extract by ultrasonic vibration for 3 times, combine the 3 extracts, concentrate and pass through silica gel Column, discard the effluent, and then elute with 20mL petroleum ether-ethyl acetate (5:1), collect the eluate, concentrate and dilute to 1.0mL.

[0046] (2) Preparation of standard solution: Accurately weigh 100mg (accurate to 0.1mg) of each polydimethylsiloxane standard product, dissolve it in ethyl acetate in a 100mL volumetric flask and make it to volume. The concentration of the solution is 1g / L , stored in a refrigerator at 4°C, valid for 6 months; standard working solution: absorb the standard stock solution, dilute it step by step with ethyl acetate to obtain 10, 25, 50, 100, 200, 500mg of polydimethylsiloxane / L series of standard solutions.

[0047] Take 10 μL ea...

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Abstract

The invention provides a method for detecting polydimethylsiloxane in a food. The content of a high molecular compound is determined by a pyrolysis gas chromatography / mass spectrometry. The method comprises the following steps of: performing high temperature pyrolysis on the polydimethylsiloxane in the food to obtain low-molecular compounds; discovering that the hexamethyl cyclotrisiloxane in the compounds can be used as an indicating component for determining the polydimethylsiloxane by authenticating the components of pyrolysis products by gas chromatography / mass spectrometry; determining whether complex pyrolysis products of a sample have the hexamethyl cyclotrisiloxane by taking m / z 207, 191, 177 and 133 as mass spectrum characteristic ions of the hexamethyl cyclotrisiloxane so as to qualitatively determine whether the sample has the polydimethylsiloxane; and calculating the content of the polydimethylsiloxane in the sample by an external reference method by taking the m / z 207 as quantitative ions. The method provided by the invention has the characteristics of simplicity, rapidness, accuracy, reliability, and high sensitivity, and can be used for detecting the content of the polydimethylsiloxane in various types of food.

Description

technical field [0001] The invention belongs to the field of organic matter analysis and detection, and in particular relates to a detection method and application of polydimethylsiloxane. Background technique [0002] Polydimethylsiloxane (Polydimethylsiloxane) is often used as a defoamer or glazing agent in food processing, and its allowable usage is generally 0.01-0.2g / kg. Residues of polydimethylsiloxane in the human body can pose a health hazard. my country's "Hygienic Standards for the Use of Food Additives" (GB2760-2007) stipulates that the maximum amount of "polydimethylsiloxane" used in edible oils and fats is 10mg / kg, and the maximum amount used in meat products is 0.2g / kg. At present, there is no report on the method for quantitative detection of polydimethylsiloxane at home and abroad, and it is impossible to monitor the content of polydimethylsiloxane in food. It is urgent to establish a method that can quickly and easily detect polydimethylsiloxane. A method ...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 吴惠勤黄晓兰林晓珊朱志鑫马叶芬黄芳邓欣罗辉泰
Owner INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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