Full
Outline
To establish a method for determination of the residual levels of 2 kinds of ultraviolet absorbers in new food contact materials.
The sample was firsty frozen and crushed, and then extracted under ultrasonic extraction at room temperature for 60 min, by using dichloromethane as the extraction solvent. After being extracted twice repeatedly, the sample was analyzed with gas chromatography-tandem quadrupole mass spectrometry.By setting the programmed heating conditions, the analysis was carried out in multiple reaction monitoring (MRM)mode, and quantified by using internal standard method.
The working curves of these 2 kinds of ultraviolet absorbers drometrizole (UV-P) and bumetrizole (UV-326) showed a good linear relationship (r2 greater than 0.99), with a limit of detection as low as 0.03 mg/kg. The recovery rate addition experiment showed that the recovery rates ranged from 89.2% to 102.1%, with relative standard deviations (RSDs) between 1.9% and 5.6%.
This method shows a low limit of detection and high accuracy, which can meet the detection requirements for UV-P and UV-326 residues in plant fibers/polypropylene materials. This method can provide technical support for the risk control of food packaging which is composed of biodegradable plant fiber/polypropylene materials. The residual results indicate that the detection rates of these 2 kinds of ultraviolet absorbers in plant fiber/polypropylene materials are relatively high, and further attention should be paid to their migration risks.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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