Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1302, Issue -, Pages 34-39Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2013.05.032
Keywords
High-resolution radical scavenging assay; HPLC-HRMS-SPE-NMR; ABTS; Penicillium namyslowskii
Funding
- Drug Research Academy, University of Copenhagen
- Carlsberg Foundation
- Danish Agency for Science, Technology and Innovation via the National Research Infrastructure funds
- Marie Curie Actions grant [PIIF-GA-2008-220253]
- Apotekerfonden af 1991
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The high-resolution radical scavenging profile of an extract of the endophytic fungus Penicillium namyslowskii was used to target analysis by high-performance liquid chromatography-high-resolution mass spectrometry-solid-phase extraction-nuclear magnetic resonance spectroscopy, i.e., HPLC-HRMS-SPE-NMR, for identification of anti-oxidative secondary metabolites. This revealed the two chromatographic peaks with the highest relative response in the radical scavenging profile to be griseophenone C and peniprequinolone. The HPLC-HRMS-SPE-NMR analysis was performed in the tube-transfer mode using a cryogenically cooled NMR probe designed for 1.7 mm NMR tubes. To further explore the potential of the above HPLC-HRMS-SPE-NMR platform for analysis of endophytic extracts, six peaks displaying no radical scavenging activity were also analyzed. This allowed unambiguous identification of six metabolites, i.e., dechlorogriseofulvin, dechlorodehydrogriseofulvin, griseofulvin, dehydrogriseofulvin, mevastatin acid, and mevastatin. The high mass sensitivity of the 1.7 mm cryogenically cooled NMR probe allowed for the first time acquisition of direct detected C-13 NMR spectra of fungal metabolites, i.e., dechlorogriseofulvin and griseofulvin, directly from crude extract via HPLC-HRmS-SPE-NMR. Dechlorodehydrogriseofulvin was reported for the first time from nature. (C) 2013 Elsevier B.V. All rights reserved.
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