Rapid detection method for various ultraviolet stabilizers in PET (polyethylene terephthalate) plastic bottle
A technology of ultraviolet stabilizer and detection method, which is applied in the direction of measuring device, material separation, analysis material, etc., to achieve the effect of good extraction effect, accurate and reliable qualitative identification, and simple method
Active Publication Date: 2018-03-09
GUANGDONG TESTING INST OF PROD QUALITY SUPERVISION
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Embodiment 1
[0071] 1. Preprocessing steps
[0072] 1.1 Extraction
[0073] In this example, chloroform, ethyl acetate, n-hexane, methanol, acetonitrile, and acetone were compared as extraction solvents, soaked for more than 2 hours, and ultrasonically extracted. Among them, chloroform had the best extraction effect, because chloroform can make the sample Swelling makes the substance to be tested more easily extracted.
[0074] Crush the PET plastic bottle, weigh 5.0g (accurate to 0.01g) and place it in a 25mL colorimetric tube, add 20mL of extraction solvent and soak for 2 hours to make the sample swell, then ultrasonicate at 40khz frequency for 60min, add 5mL of methanol and acetonitrile mixed solution (V:V=3:2) to clarify the extract, dilute to 25mL with extraction solvent and shake well, take 5.0mL in a nitrogen blowpipe, blow dry with nitrogen at 40°C, and use 1.0mL of methanol and acetonitrile containing 0.1% formic acid The mixed solution (V:V=3:2) was dissolved, and the membrane ...
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Abstract
The invention discloses a rapid detection method for various ultraviolet stabilizers in a PET (polyethylene terephthalate) plastic bottle. The method includes the steps: (1) extracting the ultravioletstabilizers by the aid of a trichloromethane assisted methyl alcohol and acetonitrile mixed solution method to obtain liquid to be detected; (2) preparing mixed standard operation solution; (3) performing column chromatography separation on the sample liquid to be detected and the mixed standard operation solution, and performing detection by the aid of an ultra-high performance liquid chromatography-ion trap-time-of-flight mass spectrometer; (4) comparing the sample liquid to be detected with retention time of a standard substance, accurate molecular weight and mass spectrometry fragments, and building a multistage ion fragment spectral library of the ultra-high performance liquid chromatography-ion trap-time-of-flight mass spectrometer of the multistage ultraviolet stabilizers. The ultraviolet stabilizers in the PET plastic bottle can be rapidly screened, qualitatively judged and quantitatively analyzed. Various ultraviolet stabilizers can be detected and confirmed by the aid of iontrap mass spectrometry and time-of-flight mass spectrometry of the ultra-high performance liquid chromatography-ion trap-time-of-flight mass spectrometer.
Description
technical field [0001] The invention belongs to the technical field of food-related product detection, and in particular relates to a rapid detection method for various ultraviolet stabilizers in PET plastic bottles. Background technique [0002] Polyethylene terephthalate PET is a plastic material widely used in food packaging. In order to improve its ability to resist photooxidative decomposition, a certain amount of ultraviolet stabilizer is often added. [0003] UV stabilizer is a kind of light stabilizer, which can absorb the ultraviolet part of sunlight and fluorescent light source without changing itself. Adding UV stabilizers to plastics and other polymer materials can selectively absorb high-energy ultraviolet rays, turning them into harmless energy for release or consumption, thereby prolonging the service life of plastic products. During the long-term storage of food, PET plastic bottles containing UV stabilizers may migrate into food through absorption, dissolut...
Claims
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Login to View More IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/009
Inventor 唐穗平李锦清陈满英綦艳邱启东
Owner GUANGDONG TESTING INST OF PROD QUALITY SUPERVISION