A method was developed for the rapid simultaneous determination of fipronil and its metabolite residues in eggs using ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). The egg samples (2 g) with 2 mL water were extracted with 4 mL acetonitrile. After adding 1 g sodium chloride, the mixture was centrifuged at 9000 r/min for 10 min at 4℃. The suspension was diluted and filtered through a 0.22 μm organic membrane. The analytes were separated on a C18 column (100 mm×2.1 mm, 1.7 μm), and detected under the multiple reaction monitoring (MRM) mode with a negative ESI source. The average recoveries of fipronil and its metabolites varied from 77.4% to 112.1%, and the relative standard deviations were between 4.0% and 13.6% at three spiked levels. The limits of detection (LODs) ranged from 0.10 μg/kg to 0.43 μg/kg. The method is simple, effective, and can be applied to real samples.
Majorana fermion and Weyl fermion have matters and antimatters. But Majorana fermion has zero resistance and Weyl fermion has a resistance. It was confirmed that CP symmetry is preserved in the case of Dirac fermion because it only has spin current as the antimatter. Dirac fermion is supercurrent because CP symmetry is preserved by double schottky contact, but the Majorana fermion with ohmic contact has decreased current due to symmetry violation. Parity symmetry conservation was confirmed from the electrical properties of transistors, and charge symmetry conservation was confirmed in diode properties.
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