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Method for monitoring permeation behavior of photoinitiator 907 in plastic package

A photoinitiator, -907 technology, applied in measuring devices, analytical materials, material excitation analysis, etc., can solve problems such as human health hazards, food pollution, and weak signals

Active Publication Date: 2021-07-16
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the ink is cured, the unpolymerized photoinitiator will remain in the ink on the food packaging, and will migrate into the food under certain conditions, causing potential harm to human health
Between 2009 and 2011, there were 6 incidents of migration of Irgacure907 on food contact packaging into food, resulting in food contamination
[0006] Raman spectroscopy can provide information on the structure, components, and functional groups of substances. It is the fingerprint of substances, but the signal is weak and the fluorescence interference is large.

Method used

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  • Method for monitoring permeation behavior of photoinitiator 907 in plastic package
  • Method for monitoring permeation behavior of photoinitiator 907 in plastic package
  • Method for monitoring permeation behavior of photoinitiator 907 in plastic package

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, seven commonly used photoinitiators are selected, namely ITX, TPO, EDB, EHA, Irgacure 907, MK and CBP, and their Raman spectra are collected.

[0039] Pipette 2 μL of seven photoinitiator standard solutions (ITX, TPO, EDB, EHA, Irgacure 907, MK, and CBP) with a concentration of 10 mg / L and transfer them to the parafilm, blank acetonitrile as a control, and then add 2 μL of AuNPs (50nm, 250 mg / L), and mixed with a pipette gun for 20 s, then 2 μL of the mixed solution was dropped onto a gold plate, and dried at room temperature in the dark for Raman spectrum measurement.

[0040] The standard solutions (10 mg / L) of these seven photoinitiators were dropped onto the gold plate for SERS detection. The SERS spectra of seven photoinitiators are shown in figure 1 , compared with the control, the photoinitiators with Raman signal include Irgacure 907, TPO, MK and ITX, while EDB, EHA and CBP have no Raman signal. The characteristic peak of Irgacure 907 is at...

Embodiment 2

[0049] Based on the theoretical results of Example 1, this example provides a method for the penetration behavior of photoinitiator-907 in PE, and the specific operations are as follows:

[0050] Prepare 200mg / L Irgacure 907 acetone solution, take 2 μL Irgacure 907 acetone solution and drop it on the front of PE, and dry it in a closed petri dish wrapped with tinfoil at room temperature. Take it out at 6h and 12h.

[0051] Prepare a 250mg / LAuNPs solution, drop 50nm on the same position of PE plastic, and scan at a depth of 0-40μm; add AuNPs at the position where the photoinitiator is exposed on the reverse side of the plastic at the same time, and scan at a depth of 40-80μm. The parameters of the Raman instrument are set as laser emission power of 0.5mW, acquisition time of 0.5s, scanning range of 5×5μm, 9 plane scanning points, and a step size of 20μm.

[0052] Scan results see Figure 9 ,Depend on Figure 9 It can be seen that under this condition, the penetration of phot...

Embodiment 3

[0054] This embodiment provides a method for the penetration behavior of photoinitiator-907 in PET, and the specific operations are as follows:

[0055] Dissolve 200 mg / L photoinitiator-907 (Irgacure 907) solution in acetonitrile, then take 2 μL and drop it on the front of PET, and dry it in an airtight Petri dish wrapped with tinfoil at room temperature, with different exposure times (1d, 5d, 10d, 15d, 20d) were taken out, and AuNPs (50nm, 250mg / L) was dropped to the same position on the front of the plastic, and the scanning depth was 0-40μm; at the position where the photoinitiator-907 was exposed on the back of the plastic At the same time, AuNPs were added dropwise, and the scanning depth was 40-80 μm. The parameters of the Raman instrument were set to 0.5mW power, 0.5s acquisition time, scanning range 5×5μm, 9 plane scanning points, and a step diameter of 20μm.

[0056] Scan results see Figure 10 ,Depend on Figure 10 It can be seen that under this condition, the pen...

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Abstract

The invention discloses a method for monitoring the permeation behavior of a photoinitiator in a plastic package, and belongs to the technical field of food safety detection. The method comprises the following specific steps: dissolving a photoinitiator in a common ink solvent, dripping on the surface of a plastic package, putting into a closed culture dish wrapped by tin foil paper, transferring for a period of time, dripping nano-gold sol at the same position where the photoinitiator is exposed, drying, and carrying out Raman spectrum detection. The surface enhanced Raman spectroscopy established by the invention does not need complex sample pretreatment operation, has the advantages of less sample and reagent dosage, low cost, rapid detection and high sensitivity, and is suitable for monitoring the migration behavior of the photoinitiator.

Description

technical field [0001] The invention belongs to the technical field of rapid detection of food safety hazard components, in particular to a method for monitoring the penetration behavior of photoinitiators in plastic packaging. Background technique [0002] Photoinitiators are a class of compounds that can absorb radiation energy in the ultraviolet or visible light region, generate active intermediates (free radicals or cations), and then initiate monomer polymerization, crosslinking and curing. They are important components of UV-curable inks. It directly affects the light curing rate and curing degree, and is widely used in the food packaging and printing industry. Wherein, 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone (photoinitiator-907 or Irgacure 907) is a kind of high-efficiency photoinitiator, because it has It has the advantages of good stability, fast curing speed, and no yellowing. It is often used in UV-curable inks. However, after the ink is cured, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/04G01N21/65
CPCG01N13/04G01N21/658G01N21/65G01N2021/655
Inventor 蔡荟梅彭雲侯如燕程燕
Owner ANHUI AGRICULTURAL UNIVERSITY
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