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  • Title: Determination of MS-222 in Water Samples by Solid-phase Extraction Coupled with Liquid Chromatography/Tandem Mass Spectrometry.
    Author: Zhao DH, Wang Q, Wang XF, Li ZG, Li YX, Huang K, Li LD.
    Journal: J Chromatogr Sci; 2017 Sep 01; 55(8):813-817. PubMed ID: 28472452.
    Abstract:
    A practical solid-phase extraction (SPE) method coupled with liquid chromatography/tandem mass spectrometry (LC-MS/MS) has been developed for the determination of the fish anesthetic MS-222 in water. Water samples were concentrated and purified using three SPE cartridges of different specifications. Elution curves of MS-222 were constructed using various methanol-water solutions on the different cartridges, and SPE conditions were optimized in accordance with the elution curves. The mobile phase containing methanol and 0.1% formic acid solution with a linear gradient elution was utilized to separate MS-222 on a C18 column. Detection was carried out by a triple-quadrupole mass spectrometry with an electrospray ion source in positive mode. Recoveries of three MS-222 fortified levels of 0.05, 0.5 and 5 μg/L ranged of 82.6-101% with relative standard deviations (RSDs) below 9.36%. The limit of detection (LOD) and limit of quantification (LOQ) of MS-222 were 0.01 μg/L and 0.03 μg/L, respectively. This method was satisfactorily applied to the determination of MS-222 in actual water samples collected from aquatic product transportation vehicles or from the natural water catchments.
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