A simple and rapid method for detecting the pesticide fipronil on egg shells and in liquid eggs by Raman microscopy
| Autor: | Tianxi Yang, Yanqi Qu, Siyue Gao, Qin Tu, Xinyi Du, Jinyi Wang, Lili He, Michael E. Hickey, Qingmiao Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
Detection limit
Chromatography 010401 analytical chemistry Extraction (chemistry) 04 agricultural and veterinary sciences Pesticide 040401 food science 01 natural sciences 0104 chemical sciences Standard curve chemistry.chemical_compound symbols.namesake 0404 agricultural biotechnology chemistry embryonic structures symbols Acetone Eggshell Raman spectroscopy Fipronil Food Science Biotechnology |
| Zdroj: | Food Control. 96:16-21 |
| ISSN: | 0956-7135 |
| DOI: | 10.1016/j.foodcont.2018.08.025 |
| Popis: | The pesticide fipronil was recently involved in a “poisonous eggs” scandal which resulted in substantial economic losses and public health risks. We report a simple and rapid method which can be implemented to detect fipronil on egg shells and in liquid eggs by Raman spectrometry. Fipronil rapidly crystallizes when solubilized in water-acetone solution (1:6, V/V, acetone/water). This process can be visually observed by naked eyes, suggesting a possible rapid and instrument-free screening action. Then, fipronil crystals were concentrated and recovered on a gold-coated glass slide for further identification and quantification by Raman microscopic analyses. A standard curve was established to quantify fipronil within the range of 1–500 mg/L (r2 ≥ 0.997), based on the unique fipronil Raman shift at 2256 cm−1. Acetone based extraction recovered fipronil at three spiked levels of 5, 60 and 100 mg/kg on chicken egg shells and in liquid eggs from 59.91% to 81.72% and 85.97% to 152.46%, respectively. The limit of detection translated to the weight of liquid egg (0.32 mg/kg) and the surface area of an egg shell (0.065 mg/m2). In conclusion, this method has demonstrated a strong capacity for the rapid ( 30 min) detection of fipronil on chicken egg shells and in liquid eggs. |
| Databáze: | OpenAIRE |
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