Journal
TALANTA
Volume 195, Issue -, Pages 245-250Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2018.11.042
Keywords
Stir bar sorptive extraction; Bacterial volatile compounds; Gas chromatography-mass spectrometry; Metabolite profile; Staphylococcus aureus
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Funding
- Institut National de la Sante et de la Recherche Medicale
- Nimes metropole
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We propose a new approach combining the principles and advantages of stir bar sorptive extraction (SBSE) and headspace sorptive extraction (HSSE). Stir bars have so far never been used for the extraction of volatile/semi-volatile bacterial compounds. The effectiveness of two stir bars with polydimethylsiloxane (PDMS) or ethylene glycol/silicone (EGS) as sorbent was tested by performing sample extraction directly in gas chromatography (GC) vials containing bacterial cultures. Several combinations of desorption and extraction were tested at different growth times. When the extraction was carried out simultaneously with the EGS stir bar in headspace and the PDMS in the bacterial culture, the number of extracted compounds was significantly increased. Using both twisters increased the polarity range of the compounds found, and extraction at the end of the exponential phase of growth generated the best yields. This method was successfully applied to determine the production of 17 molecules by a strain of Staphylococcus aureus. In conclusion, this study paves the way for a new method for determining the volatile metabolite profile of bacteria, which can provide a promising innovative alternative in the identification of biomarkers.
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