In Vivo and In Vitro Volatile Organic Compounds (VOCs) Analysis in Bacterial Diagnostics: Case Studies in Agriculture and Human Diseases

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Bacterial Volatile Compounds as Mediators of Airborne Interactions

Abstract

With an increasing interest in volatiles metabolic pathways within bacterial species, investigation into the role of volatile organic compounds (VOCs) produced by different bacteria and their potential application in diagnostics now follows. A significant body of work was accumulated over the past few decades to achieve such goal, mostly aided by the advances in volatiles analytical detection technologies. A handful of pathogenic bacterial species have been extensively investigated and potential VOCs biomarkers or profiles have been proposed to diagnose such pathogens during infection. However, it was found that develo** species-specific VOCs biomarkers is much more challenging than just VOCs profile characterization. Using VOCs profile fingerprinting for pathogen detection is promising without the need to identify exact VOCs. Studying VOCs produced in vivo and in vitro by the same species additionally showed discrepancy between the two experimental setups, which is a result of the different growth conditions, nutrients utilization, and background VOCs produced from the culture medium or the host. Such discrepancy has hindered the translation of numerous in vitro results to in vivo studies. Consequently, in this chapter we review results from in vitro versus in vivo experimental setups in the context of two major applications including bacterial VOCs diagnostics in agriculture and human diseases.

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Abbreviations

APCI:

Atmospheric pressure chemical ionization

CF:

Cystic fibrosis

eNose:

Electronic nose

GC:

Gas chromatography

MS:

Mass spectrometry

PGPR:

Plant growth-promoting rhizobacteria

SIFT:

Selected ion flow tube

SPME:

Headspace solid-phase microextraction

VOCs:

Volatile organic compounds

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Acknowledgements

Dr. Mohamed Farag thanks the funding received to his laboratory supported by a grant from Jesour program, ASRT grant number 30, Cairo, Egypt and Cairo University research support grant.

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Correspondence to Mohamed A. Farag .

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Elmassry, M.M., Farag, M.A. (2020). In Vivo and In Vitro Volatile Organic Compounds (VOCs) Analysis in Bacterial Diagnostics: Case Studies in Agriculture and Human Diseases. In: Ryu, CM., Weisskopf, L., Piechulla, B. (eds) Bacterial Volatile Compounds as Mediators of Airborne Interactions. Springer, Singapore. https://doi.org/10.1007/978-981-15-7293-7_4

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