Determination of dissolved domoic acid in seawater with reversed-phase extraction disks and rapid resolution liquid chromatography tandem mass spectrometry with head-column trapping

作者：de la Iglesia Pablo^*; Gimenez Gemma; Diogene Jorge

来源：Journal of Chromatography A, 2008, 1215(1-2): 116-124.

DOI：10.1016/j.chroma.2008.10.123

• Domoic acid
• Solid-phase extraction
• Rapid resolution chromatography
• Mass spectrometry
• Seawater

Domoic acid (DA) is the principal neurotoxin responsible for amnesic shellfish poisoning (ASP) and is produced, among other species, by marine diatoms of the genus Pseudo-nitzschia. In this work, a method for the determination of dissolved DA and its isomers present in seawater has been developed, based on a solid-phase extraction (SPE) disks followed by rapid resolution liquid chromatography coupled with tandem mass spectrometry. SPE provided sample desalting and 20-fold concentration of dissolved DA, while complete resolution between DA and its isomers was achieved in less than 3 min with rapid resolution chromatography thus providing high sample throughput. Additionally, a simple on-column chromatographic procedure allowed head-column trapping of DA providing 15-fold higher sensitivity. The conditions developed in this work have shown appropriate quality parameters in a within-laboratory validation. The detection limit was 0.02 ng mL(-1) for the whole method, while trueness ranged between 92.1% and 110.6% recovery and precision between 8.4% and 19.0% relative standard deviation. Expanded uncertainty measured was 1.92, 0.23 and 0.03 for 10.0. 1.0 and 0.1 ng mL(-1) DA concentrations, respectively,which demonstrated the accuracy of this method for confirmation and quantification of DA present at very low concentration levels in seawater.

• 出版日期2008-12-26