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Appl Environ Microbiol. 1986 March; 51(3): 664-667
Copyright © 1986, American Society for Microbiology. All Rights Reserved.

Comparison of Acridine Orange, Acriflavine, and Bisbenzimide Stains for Enumeration of Bacteria in Clear and Humic Waters

Irina Bergström, Anne Heinänen and Kalevi Salonen*

1 Department of General Microbiology, University of Helsinki, SF-00280 Helsinki, and Lammi Biological Station, University of Helsinki, SF-16900 Lammi, 2 Finland

ABSTRACT

In highly humic water, acridine orange precipitated with dissolved humic matter, resulting in such bright background fluorescence that no bacteria could be seen. With bisbenzimide staining, a similar precipitate was nonfluorescent but obscured many cells. An acriflavine staining method proved useful and reproducible both in clear and in humic waters. Fading of fluorescence was not a problem, and stained samples could be stored after preparation. The fluorescence of cells stained with acriflavine was weaker than that with acridine orange, making counting extremely small cells slightly more difficult with the former stain.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1986 March; 51(3): 664-667
Copyright © 1986, American Society for Microbiology. All Rights Reserved.



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Copyright © 1986 by the American Society for Microbiology. All rights reserved.