Native fluorescence and excitation spectroscopic changes in Bacillus subtilis and Staphylococcus aureus bacteria subjected to conditions of starvation
| Autor: | Robert R. Alfano, D.V. Will, Mahendra Shah, Glenn Minko, Steven A. McCormick, Richard B Rosen, Alvin Katz, Alexandra Alimova, Howard E. Savage |
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| Přispěvatelé: | Alimova, A, Katz, A, Savage, He, Shah, M, Minko, G, Will, Dv, Rosen, Rb, Mccormick, Sa, Alfano, Roberto |
| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
Staphylococcus aureus
Materials Science (miscellaneous) Iron Siderophores Bacillus subtilis Endospore Industrial and Manufacturing Engineering Fluorescence spectroscopy chemistry.chemical_compound Optics Species Specificity Business and International Management Spectroscopy Picolinic Acids Spores Bacterial biology 3-Hydroxybutyric Acid business.industry fungi Tryptophan biology.organism_classification Dipicolinic acid Fluorescence Culture Media Spectrometry Fluorescence chemistry Starvation business Bacteria Nuclear chemistry |
| Popis: | Fluorescence emission and excitation spectra were measured over a 7-day period for Bacillus subtilis (Bs), a spore-forming, and Staphylococcus aureus (Sa), a nonspore-forming bacteria subjected to conditions of starvation. Initially, the Bs fluorescence was predominantly due to the amino acid tryptophan. Later, a fluorescence band with an emission peak at 410 nm and excitation peak at 345 m, from dipicolinic acid, appeared. Dipicolinic acid is produced during spore formation and serves as a spectral signature for detection of spores. The intensity of the 410-nm band continued to increase over the next 3 days. The Sa fluorescence was predominantly from tryptophan and did not change over time. In 6 of the 17 Bs specimens studied, an additional band appeared with a weak emission peak at 460 cm and excitation peaks at 250, 270, and 400 nm. The addition of beta-hydroxybutyric acid to the Bs or the Sa cultures resulted in a two-order of magnitude increase in the 460-nm emission. The addition of Fe2+ quenched the 460 emission, indicating that a source of the 460-nm emission was a siderophore produced by the bacteria. We demonstrate that optical spectroscopy-based instrumentation can detect bacterial spores in real time. |
| Databáze: | OpenAIRE |
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