Abstract
A new method for the assessment of the effects of several contaminants on marine microalgae, Tetraselmis suecica (Kyling) Butcher, Skeletonema costatum (Grev.) Cleve, and Prorocentrum lima (Ehrenberg) Dodge was developed in 1990. The method is based on the measurement of cell esterase activity using a fluorimetric stain, fluorescein diacetate (FDA), selected from amongst three stains (FDA, Neutral Red, thiazolyl tetrazolium bromure) for its higher sensitivity. Biochemical (K m, V max) and physiological (growth, specific activity) aspects of the enzymatic activity as revealed by the FDA method are discussed. Different categories of compounds (weed-killers, insecticides, metals) and some water samples from Seine Bay were tested for their toxic effects on microalgae. Experiments were performed on microplates using a fluorimetric microplate reader. The various steps of the experiments and data-processing were controlled by software. Applications of the system to rapid ecotoxicological tests (determination of the IC50, i.e., the concentration at which 50% inhibition of growth occurs) and to the assessment of environment quality by studying the toxic effect of water samples on microalgae are proposed.
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Communicated by J. M. Pérès, Marseille
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Gilbert, F., Galgani, F. & Cadiou, Y. Rapid assessment of metabolic activity in marine microalgae: application in ecotoxicological tests and evaluation of water quality. Mar. Biol. 112, 199–205 (1992). https://doi.org/10.1007/BF00702462
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DOI: https://doi.org/10.1007/BF00702462