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Determining method for polydimethylsiloxane in edible oil and meat products

A technology of dimethylsiloxane and its determination method is applied in the field of analytical chemistry to achieve the effects of strong selectivity, low pollution and good reproducibility

Inactive Publication Date: 2012-12-19
INNER MONGOLIA AUTONOMOUS REGION PROD QUALITY TEST INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After all, there is a limit for safe use as a food additive

Method used

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  • Determining method for polydimethylsiloxane in edible oil and meat products
  • Determining method for polydimethylsiloxane in edible oil and meat products
  • Determining method for polydimethylsiloxane in edible oil and meat products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment one, the mensuration of polydimethylsiloxane in edible oil:

[0025] 1. Preparation of sample solution

[0026] 1) Sampling: Accurately weigh 1.0g of edible oil sample into a 10mL glass centrifuge tube, the weight of the edible oil sample is accurate to 0.01g;

[0027] 2) Methyl esterification: Add 1mL of 2M methanolic potassium hydroxide solution to the edible oil sample, vortex and mix for 1min, then add 1mL of water to obtain a mixed solution;

[0028] 3) Extraction and separation: Add 2 mL of n-hexane to the mixed solution, vortex and mix for 3 minutes, transfer the n-hexane solution to a 10 mL centrifuge tube to obtain the extract, repeat the extraction once, and combine the two extracts;

[0029] 4) Concentration: Concentrate the combined extracts to 2 mL by nitrogen blowing at 45 °C, which is the sample liquid.

[0030] 2. Set the instrument parameters

[0031] 1) Cracker conditions

[0032] Interface temperature: 310°C

[0033] Cracking temperatu...

Embodiment 2

[0057] Embodiment two, the mensuration of polydimethylsiloxane in the meat product:

[0058] 1. Preparation of sample solution

[0059] 1) Sampling: Accurately weigh 1.0g of meat product sample, the weight of the meat product sample is accurate to 0.01g, wrap the meat product sample with filter paper, extract the fat in the meat product sample through ether Soxhlet, extract with ether for 7 hours, and reflux 6-8 times / h, rotary steamed at 180bar, 40℃ to 4-6mL, then concentrated to 0.5mL by nitrogen blowing;

[0060] 2) Methyl esterification: Add 1mL of 2M methanolic potassium hydroxide solution to the edible oil sample, vortex and mix for 1min, then add 1mL of water to obtain a mixed solution;

[0061] 3) Extraction and separation: Add 2 mL of n-hexane to the mixed solution, vortex and mix for 3 minutes, transfer the n-hexane solution to a 10 mL centrifuge tube to obtain the extract, repeat the extraction once, and combine the two extracts;

[0062] 4) Concentration: Concent...

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Abstract

The invention belongs to the field of analytical chemistry and specifically relates to a determining method for polydimethylsiloxane in edible oil and meat products. The determining method comprises the following steps: (1) sampling: weighing a defined amount of edible oil sample or meat product sample; (2) performing methyl esterification: adding a potassium hydroxide carbinol solution into the edible oil sample or meat product sample, spirally mixing and adding a defined amount of water; (3) extracting and separating: adding n-hexane, spirally mixing, transferring an n-hexane solution to a centrifuge tube, repeating the extraction and combining the extracting solutions at two times; (4) concentrating: concentrating the combined extracting solutions by blowing nitrogen, thereby obtaining a sample solution; and (5) analyzing and determining: qualitatively and quantitatively analyzing and determining the sample solution according to a pyrolysis gas-phase chromatography and mass spectrography method. The determining method provided by the invention has the beneficial effects that the polydimethylsiloxane in the edible oil and the meat products can be analyzed and determined; the determining method has the characteristics of high speed, strong selectivity, small pollution, low limit of detection, and the like; and the determining method has the advantages of small sampling amount, high analyzing speed, excellent reproducibility, and the like.

Description

[technical field] [0001] The invention relates to the field of analytical chemistry, in particular to a method for determining polydimethylsiloxane in edible oil and meat products. [Background technique] [0002] In July 2010, it was reported that an investigation found that Chicken McNuggets in the United States actually contained the rubber chemical component "polydimethylsiloxane". A spokesman for McDonald's in the United States said that the addition of polydimethylsiloxane to McNuggets is based on safety reasons to prevent the cooking oil of fried chicken nuggets from foaming. Although animal tests by the World Health Organization have shown that the substance is harmless to humans, the addition of this rubber component to food has caused public panic. [0003] Polydimethylsiloxane, also known as dimethyl silicone oil, is used as leather softener, defoamer in dyeing industry, release agent for rubber or plastic products, cosmetic additive, defoamer and additive in brew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/08
Inventor 刘平年俞安敏冯颖何志明胡欣
Owner INNER MONGOLIA AUTONOMOUS REGION PROD QUALITY TEST INST
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