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. 2013 Jun 5;11(6):1936–1960. doi: 10.3390/md11061936

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Mass chromatograms of the LC-ESI-CID-MS/MS obtained under multiple reaction monitoring (MRM): (A) extracted ion chromatogram (XIC) of OA standard (200 ng/mL), m/z 803.5 > 255.5/113.5; (B) XIC of 13-desmethyl SPX C standard (200 ng/mL), m/z 692.4 > 674.4/444.4; (C) XIC of a positive sample for OA in N. lapillus (m/z 803.5 > 255.5/113.5); (D) XIC of a positive sample for 13-desmethyl SPX C in N. lapillus (m/z 692.4 > 674.4/444.4).