A simple colorimetric method for detecting cell viability in cultures of eukaryotic microorganisms |
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Authors: | Angelo Bonora Donatella Mares |
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Institution: | (1) Institute of Pharmacology, University of Ferrara, Via Fossato di Mortara 64, I-44100 Ferrara, Italy;(2) Institute of Botany, University of Ferrara, Corso Porta Mare 2, I-44100 Ferrara, Italy |
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Abstract: | The dye methylene blue can be taken up by dead or severely damaged cells, but not by living cells. Based on this fact, a method was devised which permits quantitative determinations of injured cells in populations of microorganisms such asSaccharomyces cerevisiae, Rhodotorula glutinis, andEuglena gracilis. The percentage of damaged cells was determined by measuring, at 664 nm, the optical density of cell suspensions pretreated with 0.15 mM methylene blue for 6 min, a condition that does not affect cell integrity as determined by oxygen consumption and release of potassium ions. This technique is faster and simpler than the classical dye-exclusion and plate-counting methods. |
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