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Fluorescence detection method for phthalate plasticizer in oil substance

A technology of phthalate and ester plasticizer, applied in the field of detection, can solve the problems of many chemical reagents, unsuitable phthalate content detection, complicated operation steps, etc., and achieves low cost, The detection conditions are mild and easy to control, and the operation is convenient.

Active Publication Date: 2019-12-03
RES INST OF AGRO PROD PROCESSING SHANXI ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this invention is not suitable for the detection of phthalates in oils and fats, and more chemical reagents are required for the detection, and the operation steps are more cumbersome

Method used

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  • Fluorescence detection method for phthalate plasticizer in oil substance
  • Fluorescence detection method for phthalate plasticizer in oil substance

Examples

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Effect test

Embodiment 1

[0017] A method for detecting the content of phthalates in sesame oil by using the method of the invention.

[0018] (1) Preparation of phthalate standard curve Weigh 1mg, 2mg, 3mg, 4mg, and 5mg of phthalate standard products into 5 numbered 1L volumetric flasks, and dilute to volume with triglyceride. It is configured as a series of phthalate standard solutions with gradient distribution. Then pipette 1mL from the standard solutions of the five 1L volumetric flasks into sequentially numbered 20mL containers, add 10mL of 10% NaOH solution to all containers, and then place all containers in a water bath and stir at a constant temperature at 90°C until Evaporate the liquid to dryness, fully saponify the sample to be tested, fully hydrolyze the phthalate contained in it into sodium phthalate and alcohol, then cool to room temperature, then add 10mL deionized water to the container respectively, stir, and make A small amount of sodium phthalate generated in the container is fully...

Embodiment 2

[0025]The method adopts the method of the invention to detect the content of phthalates in edible oil.

[0026] (1) Preparation of phthalate standard curve Weigh 1, 2, 3, 4, and 5 mg of phthalate standard products into 5 numbered 1L volumetric flasks, dilute to volume with triglyceride, It is configured as a series of phthalate standard solutions with gradient distribution. Then pipette 1mL from the standard solutions of the five 1L volumetric flasks into sequentially numbered 20mL containers, add 10mL of 10% NaOH solution to all containers, and then place all containers in a water bath and stir at a constant temperature at 100°C until Evaporate the liquid to dryness, fully saponify the sample to be tested, fully hydrolyze the phthalate contained in it into sodium phthalate and alcohol, then cool to room temperature, then add 10mL deionized water to the container respectively, stir, and make A small amount of sodium phthalate generated in the container is fully dissolved in w...

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Abstract

The invention discloses a fluorescence detection method for a phthalate plasticizer in an oil substance. The fluorescence detection method comprises the following steps of (1) preparing a phthalate standard curve, (2) preparing saponification hydrolysate, (3) preparing a fluorescent derivative, and (4) performing detection and conversion. According to the method, NaOH is adopted to completely saponify the oil substance, phthalate is hydrolyzed into sodium phthalate, then petroleum ether is added to thoroughly separate grease from an aqueous solution dissolved with the sodium phthalate under centrifugal action, the sodium phthalate is neutralized into phthalic acid under the action of hydrogen peroxide, a peroxy root (-O-) structure with an electron donating effect is combined to carboxyl of the phthalic acid, so that the phthalate which originally exists in the grease and cannot generate fluorescence is separated out and fluorescence is generated, and a fluorescence detection mode becomes possible. The method has the advantages of simple operation, less reagents, mild and easily controllable detection conditions, low cost and wide linear range of a working curve.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a detection method suitable for phthalate plasticizers in oil substances. Background technique [0002] Phthalate esters (PAEs) are generally a group of ester compounds formed by phthalic acid and alcohols with 4 to 15 carbons. At room temperature, except for a few solids with low melting points, the general It is a viscous liquid with high boiling point and low volatility, colorless and transparent, with a special smell, hardly soluble in water, easily soluble in various organic solvents such as ether, methanol and ethanol, and is a fat-soluble substance. Because of its excellent performance in enhancing plasticity, it is widely used as a plasticizer in the production of various plastic products such as food packaging materials, medical appliances, and cosmetics. However, PAEs are not linked with plastic matrix molecules by covalent bonds, and the two are only lin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/643
Inventor 殷龙龙李群许光映高忠东王振嵇莎莎张倩茹尹蓉胡晓军
Owner RES INST OF AGRO PROD PROCESSING SHANXI ACADEMY OF AGRI SCI
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