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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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[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 polydimethylsiloxa
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[0034] Example 1: Determination of polydimethylsiloxane in fried chicken
[0035] (1) Weigh 10.0 g of the fried chicken sample, place it in a blender and smash it, use petroleum ether-ethyl acetate (volume ratio 5:1) 50 mL, extract 3 times by ultrasonic shaking, combine the 3 times of extracts, and concentrate. Silica gel cartridge, discard the effluent, rinse with 10mL petroleum ether, discard the eluent to remove grease, and then elute with 20mL petroleum ether-ethyl acetate (volume ratio 5:1), collect the eluate, Concentrate and dilute to 1.0mL.
[0036] (2) Prepare standard solution: accurately weigh 100mg of each polydimethylsiloxane standard (accurate to 0.1mg), dissolve it with ethyl acetate in a 100mL volumetric flask, and dilute to the volume. The concentration of this solution is 1g / L , Stored in a refrigerator at 4℃, valid for 6 months; standard working solution: draw standard stock solution separately, and gradually dilute with ethyl acetate to polydimethylsiloxane 10,...
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[0044] Example 2: Determination of polydimethylsiloxane in apple peel
[0045] (1) Take the apple peel, chop it, weigh out 5.0g sample, use petroleum ether-ethyl acetate (volume ratio 5:1) 25mL, divide 3 times to ultrasonically shake to extract, combine 3 times of extraction liquid, after concentrating, pass the silica gel Column, discard the effluent, then elute with 20mL petroleum ether-ethyl acetate (5:1), collect the eluate, concentrate and dilute to 1.0mL.
[0046] (2) Prepare standard solution: accurately weigh 100mg of each polydimethylsiloxane standard (accurate to 0.1mg), and dissolve it with ethyl acetate in a 100mL volumetric flask and dilute the solution to a concentration of 1g / L , Stored in a refrigerator at 4℃, valid for 6 months; standard working solution: absorb the standard stock solution separately and dilute it with ethyl acetate to form polydimethylsiloxane 10, 25, 50, 100, 200, 500mg / L series of standard solutions.
[0047] Take 10, 25, 50, 100, 200, 500 mg / L...
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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 ...
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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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