Rapid quantitative analysis of microcystins in raw surface waters with MALDI MS utilizing easily synthesized internal standards

Dublin Core

Title

Rapid quantitative analysis of microcystins in raw surface waters with MALDI MS utilizing easily synthesized internal standards

Subject

MICROCISTINAS
CIANOTOXINAS
BIBLIOGRAFIA NACIONAL QUIMICA
2014

Abstract

The freshwater cyanotoxins, microcystins (MCs), pose a global public health threat as potent hepatotoxins in cyanobacterial blooms; their persistence in drinking and recreational water has been associated with potential chronic effects in addition to acute intoxications. Rapid and accurate detection of the over 80 structural congeners is challenged by the rigorous and time consuming clean up required to overcome interference found in raw water samples. MALDI-MS has shown promise for rapid quantification of individual congeners in raw water samples, with very low operative cost, but so far limited sensitivity and lack of available and versatile internal standards (ISs) has limited its use. Two easily synthesized S-hydroxyethyl-Cys(7)-MC-LR and -RR ISs were used to generate linear standard curves in a reflectron MALDI instrument, reproducible across several orders of magnitude for MC-LR, -RR and -YR. Minimum quantification limits in direct water samples with no clean up or concentration step involved were consistently below 7 μg/L, with recoveries from spiked samples between 80 and 119%. This method improves sensitivity by 30 fold over previous reports of quantitative MALDI-TOF applications to MCs and provides a salient option for rapid throughput analysis for multiple MC congeners in untreated raw surface water blooms as a means to identify source public health threats and target intervention strategies within a watershed. As demonstrated by analysis of a set of samples from Uruguay, utilizing the reaction of different MC congeners with alternate sulfhydryl compounds, the m/z of the IS can be customized to avoid overlap with interfering compounds in local surface water samples.

Creator

Roegner, Amber F.
Pírez Schirmer, Macarena
Puschner, Birgit

Source

Toxicon v. 78, 2014. -- p. 94-102

Publisher

Elsevier

Date

2014

Rights

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Format

PDF

Language

Inglés

Type

Artículo

Identifier

doi:10.1016/j.toxicon.2013.12.007

Document Item Type Metadata

Original Format

PDF
Date Added
December 11, 2014
Collection
Bibliografía Nacional Química
Item Type
Document
Citation
Roegner, Amber F. et al., “Rapid quantitative analysis of microcystins in raw surface waters with MALDI MS utilizing easily synthesized internal standards,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed December 15, 2025, https://riquim.fq.edu.uy/items/show/2233.