Development of an adaptable headspace sampling method for metabolic profiling of the fungal volatome
Pulmonary aspergillosis can cause serious complications in people with a suppressed immune system. Volatile metabolites emitted by Aspergillus spp. have shown promise for early detection of pathogenicity. However, volatile profiles require further research, as effective headspace analysis methods are required for extended chemical coverage of the volatome; in terms of both very volatile and semi-volatile compounds. In this study, we describe a novel adaptable sampling method in which fungal headspace samples can be sampled continuously throughout a defined time period using both active (pumped) and passive (diffusive) methods, with the capability for samples to be stored for later off-line analysis. For this method we utilise thermal desorption-gas chromatography-mass spectrometry to generate volatile metabolic profiles using Aspergillus fumigatus as the model organism. Several known fungal-specific volatiles associated with secondary metabolite biosynthesis (including α-pinene, camphene, limonene, and several sesquiterpenes) were identified. A comparison between the wild-type A. fumigatus with a phosphopantetheinyl transferase null mutant strain (ΔpptA) that is compromised in secondary metabolite synthesis, revealed reduced production of sesquiterpenes. We also showed the lack of terpene compounds production during the early growth phase, whilst pyrazines were identified in both early and late growth phases. We have demonstrated that the fungal volatome is dynamic and it is therefore critically necessary to sample the headspace across several time periods using a combination of active and passive sampling techniques to analyse and understand this dynamism.
2018
2019-07-18 08:43:50
1033
Volatile Organic Compounds, Fungi, Mycelial growth
r6
Waqar M
Ahmed
70
Pavlos
Geranios
70
Iain R.
White
70
Oluwasola
Lawal
70
Tamara M
Nijsen
70
Michael J
Bromley
70
Royston
Goodacre
70
Nicholas D
Read
70
Stephen J
Fowler
70
COBISS_ID
3
5419771
DOI
15
10.1039/C8AN00841H
NUK URN
18
URN:SI:UNG:REP:OTUOJWSA
Ahmed_2018.pdf
729330
Predstavitvena datoteka
2019-07-18 08:43:56