Abstract
Cyanobacteria are a group of photosynthetic, nitrogen-fixing bacteria present in a wide variety of habitats such as freshwater, marine, and terrestrial ecosystems. In this work, the effects of As(III), a major toxic environmental pollutant, on the lipidomic profiles of two cyanobacteria species (Anabaena and Planktothrix agardhii) were assessed by means of a recently proposed method based on the concept of regions of interest (ROI) in liquid chromatography mass spectroscopy (LC-MS) together with multivariate curve resolution alternating least squares (MCR-ALS). Cyanobacteria were exposed to two concentrations of As(III) for a week, and lipid extracts were analyzed by ultrahigh-performance liquid chromatography/time-of-flight mass spectrometry in full scan mode. The data obtained were compressed by means of the ROI strategy, and the resulting LC-MS data sets were analyzed by the MCR-ALS method. Comparison of profile peak areas resolved by MCR-ALS in control and exposed samples allowed the discrimination of lipids whose concentrations were changed due to As(III) treatment. The tentative identification of these lipids revealed an important reduction of the levels of some galactolipids such as monogalactosyldiacylglycerol, the pigment chlorophyll a and its degradation product, pheophytin a, as well as carotene compounds such as 3-hydroxycarotene and carotene-3,3′-dione, all of these compounds being essential in the photosynthetic process. These results suggested that As(III) induced important changes in the composition of lipids of cyanobacteria, which were able to compromise their energy production processes.
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Acknowledgments
The authors would like to acknowledge the financial support from the Brazilian Federal Agency for the Support and Evaluation of Graduate Education (CAPES) and Brazilian National Council for Scientific and Technological Development (CNPq) for a 1-year fellowship to Aline Marques in the Chemometrics Research Group at IDAEA-CSIC, Barcelona, Spain. K.M.G. Lima acknowledges the CNPq Grant (305962/2014-0) for financial support. This work was funded by grants from CNPq/Capes project (grant 070/2012) and by the CHEMAGEB project (FP/2007-2013)/ERC Grant Agreement no. 320737). The authors also thank Dr. Benjamín Piña and Claudia Rivetti (IDEAE/CSIC) for providing the cyanobacteria species control.
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All authors have accepted the content of this paper and the principles of ethical and professional conduct. Sources of funding are given in the Acknowledgements section. This research has no conflict of interest and has not involved humans or animals
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Marques, A.S., Bedia, C., Lima, K.M.G. et al. Assessment of the effects of As(III) treatment on cyanobacteria lipidomic profiles by LC-MS and MCR-ALS. Anal Bioanal Chem 408, 5829–5841 (2016). https://doi.org/10.1007/s00216-016-9695-5
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DOI: https://doi.org/10.1007/s00216-016-9695-5