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Title: Dereplicating and spatial mapping of secondary metabolites from fungal cultures in situ

Journal Article · · Journal of Natural Products
 [1];  [1];  [2];  [2];  [2];  [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of North Carolina at Greensboro, Greensboro, NC (United States)
  3. Mycosynthetix, Inc., Hillsborough, NC (United States)

Recently, ambient ionization mass spectrometry techniques have become prevalent in natural product research due to their ability to examine secondary metabolites in situ. Moreover, these techniques retain invaluable spatial and temporal details that are lost through traditional extraction processes. However, most ambient ionization techniques do not collect mutually supportive data, such as chromatographic retention times and/or UV/vis spectra, and this can limit the ability to identify certain metabolites, such as differentiating isomers. To overcome this, the droplet liquid microjunction-surface sampling probe (droplet-LMJ-SSP) was coupled with UPLC-PDA-HRMS-MS/MS, thus providing separation, retention times, MS data, and UV/vis data used in traditional dereplication protocols. By capturing these mutually supportive data, the identity of secondary metabolites can be confidently and rapidly assigned in situ. Using the droplet-LMJ-SSP, a protocol was constructed to analyze the secondary metabolite profile of fungal cultures without any sample preparation. Finally our results demonstrate that fungal cultures can be dereplicated from the Petri dish, thus identifying secondary metabolites, including isomers, and confirming them against reference standards. Furthermore, heat maps, similar to mass spectrometry imaging, can be used to ascertain the location and relative concentration of secondary metabolites directly on the surface and/or surroundings of a fungal culture.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Work for Others (WFO)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1214004
Alternate ID(s):
OSTI ID: 1287014
Journal Information:
Journal of Natural Products, Vol. 78, Issue 8; ISSN 0163-3864
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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Review and perspectives on the applications of mass spectrometry imaging under ambient conditions journal July 2018
Spatial and Temporal Profiling of Griseofulvin Production in Xylaria cubensis Using Mass Spectrometry Mapping journal April 2016
Mapping the Fungal Battlefield: Using in situ Chemistry and Deletion Mutants to Monitor Interspecific Chemical Interactions Between Fungi journal February 2019
Droplet probe: coupling chromatography to the in situ evaluation of the chemistry of nature journal January 2019
Media studies to enhance the production of verticillins facilitated by in situ chemical analysis journal September 2018
Rapid Characterization of Chemical Components in Edible Mushroom Sparassis crispa by UPLC-Orbitrap MS Analysis and Potential Inhibitory Effects on Allergic Rhinitis journal August 2019
Biosynthesis of Fluorinated Peptaibols Using a Site-Directed Building Block Incorporation Approach journal June 2017
Enhanced dereplication of fungal cultures via use of mass defect filtering journal January 2017
Xanthones of Lichen Source: A 2016 Update journal March 2016