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Development of a fast and selective UHPLC-DAD-QTOF-MS/MS method for the qualitative and quantitative assessment of destruxin profiles

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Abstract

A fast and selective ultrahigh-performance liquid chromatography diode array detector (UHPLC-DAD) method combined with an off-line solid phase extraction (SPE) protocol was established to monitor destruxins (dtxs), a secondary metabolite class of highly bioactive cyclic depsipeptides. Sample purification via SPE was tailored to remove both more polar and apolar matrix constituents by applying analyte class-selective washing and elution conditions. To separate and detect destruxin congeners an UHPLC-DAD system hyphenated to a quadrupole–time-of-flight (Q-TOF) hybrid mass spectrometer was utilized. Analyses were performed on a sub-2-μm-particle-size RP-18 column with an acidified (0.02 % acetic acid) 12 min water/acetonitrile solvent gradient. In the dtx congener elution zone 22 chromatographic peaks were separated. Four of these were identified by comparison with reference materials as dtx A, dtx B, dtx E, and dtx E-diol; 16 were tentatively assigned as known or novel dtx congeners by the analysis of high resolution UHPLC-DAD-QTOF-MS/MS data recorded in the positive electrospray ionization (ESI) mode. The applicability of the UHPLC-DAD assay to investigate biological materials in a qualitative and quantitative manner was proven by the application of the platform to monitor the dtx production profile of three Metarhizium brunneum strain fungal culture broths.

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Acknowledgment

This research has been supported by the European Community’s Seventh Framework Programme grant (FP7_ENV.2011.3.1.9-1 ECO-INNOVATION, INBIOSOIL, Grant Agreement No. 282767).

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Authors and Affiliations

  1. Institute of Pharmacy, Department of Pharmacognosy, CCB–Centrum of Chemistry and Biomedicine, University of Innsbruck, Innrain 80/82, 6020, Innsbruck, Austria

    Judith Taibon, Sonja Sturm, Christoph Seger & Hermann Stuppner

  2. Institute of Microbiology, University of Innsbruck, Technikerstrasse 25, 6020, Innsbruck, Austria

    Judith Taibon, Martin Parth & Hermann Strasser

  3. Institute of Medical and Chemical Laboratory Diagnostics (ZIMCL), University Hospital Innsbruck, Anichstraße 35, 6020, Innsbruck, Austria

    Christoph Seger

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  1. Judith Taibon
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  2. Sonja Sturm
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  3. Christoph Seger
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  4. Martin Parth
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  5. Hermann Strasser
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  6. Hermann Stuppner
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Correspondence to Christoph Seger.

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Taibon, J., Sturm, S., Seger, C. et al. Development of a fast and selective UHPLC-DAD-QTOF-MS/MS method for the qualitative and quantitative assessment of destruxin profiles. Anal Bioanal Chem 406, 7623–7632 (2014). https://doi.org/10.1007/s00216-014-8203-z

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  • DOI: https://doi.org/10.1007/s00216-014-8203-z

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