Journal
AEROSOL SCIENCE AND TECHNOLOGY
Volume 50, Issue 2, Pages 126-132Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/02786826.2015.1134764
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Funding
- Doctoral School of TUT
- TEKES FiDiPro-project [40371/11]
- Academy of Finland [272041]
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Online characterization of fungal and bacterial spores is important in various applications due to their health and climatic relevance. The aim of this study was to demonstrate the capability of the combination of electro-dynamic balance assisted laser-induced breakdown spectroscopy (LIBS) and laser-induced fluorescence (LIF) techniques for the online detection of single fungal spores (Aspergillus versicolor and Penicillium brevicompactum) and bacteria (Bacillus aureus). The method enabled sensitive and repeatable LIBS analysis of common elemental components (Ca, Na, and K) from single microbial particles for the first time. Significant differences in the concentrations of these elements were observed between the species, e.g., bacterial spores had over three orders of magnitude higher Ca concentration (2 x 10(12) g/particle) compared to fungal spores (3-5 x 10(16) g/particle). The LIF analysis has previously been used to distinguish bioaerosols from other aerosols due to their fluorescence ability. This study showed that combination of LIF and LIBS analysis is a promising tool for identification of different bioaerosol particle types.
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