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Fluorescence spectra type rapid detection method of phthalate substance in paper packing material

A technology of paper packaging materials and phthalic acid, applied in fluorescence/phosphorescence, analytical materials, material excitation analysis, etc., can solve the problems of poor anti-interference ability, no fluorescence, no fluorescence spectrum analysis, etc., and achieve anti-interference The effect of strong ability, rapid detection and high sensitivity

Inactive Publication Date: 2018-07-24
SHANGHAI TOBACCO GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the chromatographic method usually takes a long time for pretreatment and detection, and cannot be used as a rapid screening method
Although the detection speed of ultraviolet spectrophotometry is fast, its anti-interference ability is poor, which cannot meet the analysis of actual samples.
Reports on the determination of phthalates by fluorescence spectroscopy are not common. The main reason is that phthalates themselves do not produce fluorescence and cannot be directly analyzed by fluorescence spectroscopy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take dibutyl phthalate as the standard substance, and 0.25mol / L sodium hydroxide aqueous solution as the solvent to prepare standard solutions with concentrations of 1mg / L, 10mg / L, 15mg / L, 30mg / L and 50mg / L. Heat in a water bath at 70±2°C for 10min, and let stand to cool. Take 0.6mL of the standard solution into a centrifuge tube, slowly add 0.4mL of concentrated sulfuric acid, let it stand for 10min, and then transfer it to a cuvette. Scan the emission spectrum of each standard solution under the condition of an excitation wavelength of 280nm. The fluorescence signal intensity was used to establish a standard curve.

[0026] Cut 120.0cm 2 The paper packaging material is placed on the balance to weigh its mass. Cut the cut sample into 0.5cm×0.5cm pieces, put it into a 30mL conical flask with a stopper, add 15mL of sodium hydroxide aqueous solution with a concentration of 0.25mol / L accurately, heat it in a water bath at 70±2°C for 10min, keep it at rest. Set to cool. ...

Embodiment 2

[0029] Standard solutions with concentrations of 1 mg / L, 20 mg / L, 40 mg / L, 60 mg / L and 80 mg / L were prepared with 18 kinds of phthalates as standard substances and 90% ethanol aqueous solution as solvent. Take 0.4mL of the standard solution into a centrifuge tube, slowly add 0.6mL of concentrated sulfuric acid, let it stand for 10min, and then transfer it to a cuvette. Scan the emission spectrum of each standard solution under the condition of an excitation wavelength of 280nm. The fluorescence signal intensity was used to establish a standard curve.

[0030] Cut 120.0cm 2 The paper packaging material is placed on the balance to weigh its mass. Cut the cut samples into 0.5cm×0.5cm pieces, put them into a 50mL conical flask with a stopper, accurately add 30mL of 90% ethanol aqueous solution by volume, extract by ultrasonic for 10min, and let stand to cool. Pipette 0.4 mL of the supernatant into a centrifuge tube, slowly add 0.6 mL of concentrated sulfuric acid, and after stan...

Embodiment 3

[0033] Taking dibutyl phthalate as the standard substance and 5.0mol / L sodium bicarbonate aqueous solution as the solvent, the standard solutions with concentrations of 1mg / L, 10mg / L, 15mg / L, 30mg / L and 60mg / L were prepared. Heat in a water bath at 70±2°C for 10min, and let stand to cool. Take 0.6mL into a centrifuge tube, slowly add 0.4mL of concentrated sulfuric acid, and after standing for 10min, transfer it to a cuvette, scan the emission spectrum of each standard solution under the condition of an excitation wavelength of 280nm, and use the fluorescence at 320nm. Signal strength establishes a standard curve for the indicator.

[0034] Pipette an appropriate amount of ink on the RK ink color developing instrument at 157g / cm 2 Double-sided coated paper is used as the substrate for color development. Cut the sample in the ink color development area, cut the cut sample into pieces of about 0.5cm×0.5cm, and mix them evenly. Weigh 2.0g of sample, put it into a 50mL conical f...

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Abstract

The invention relates to a fluorescence spectra type rapid detection method of a phthalate substance in a paper packing material. The method comprises the following specific steps: 1) preparing phthalate substance as a standard substance; dissolving the standard substance with a solvent to obtain standard solutions with different concentration; dehydrating the standard solutions through a dehydrating agent to obtain standard solutions to be detected; scanning emission spectra of the standard solutions to be detected through a fluorescence spectra analyzer; and creating a standard curve; and 2)processing the paper packing material through the solvent to obtain extracting liquid; dehydrating the extracting liquid through the dehydrating agent to obtain extracting liquid to be detected; scanning the emission spectra of the extracting liquid to be detected through the fluorescence spectra analyzer; and then quantitatively analyzing the fluorescence signal intensity by an external standardmethod. The method has the advantages of being simple and convenient to operate, high in sensitivity, high in interference resistance, quick to detect, green, environmentally friendly, and suitable for rapid screening of massive samples.

Description

technical field [0001] The invention relates to a method for rapid determination of phthalates in food contact materials, in particular to the rapid determination of phthalates in paper packaging materials by fluorescence spectroscopy. Background technique [0002] Phthalates are the most common and widely used plasticizers with excellent properties and are widely used in food packaging materials, toys, medical equipment, rubber, resins and other industries. But at the same time, phthalates are a class of environmental hormones that are harmful to the human body, which can change the human endocrine system and cause reproductive, developmental and behavioral abnormalities. The Chinese Ministry of Health has designated such substances as non-edible substances and banned them as food additives. [0003] Paper packaging materials have become an important material in the food packaging industry due to their good performance and advantages in green environmental protection. How...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/6402
Inventor 李炜王蕾朱翔陈栎娜
Owner SHANGHAI TOBACCO GRP CO LTD
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