Istituto di Biofisica     
Scarano G., Morelli E. Binding of Cu, Pb, Zn and Cd to the cell surface of the marine diatom Phaeodactylom tricornutum. In: Toxicology and Environmental Chemistry, vol. 72 pp. 93 - 104. The gordon and Breach Science, 1999.
The binding of Cu, Pb, Zn and Cd to the cell surface of the marine alga Phaeodactylom tricornutum was studied in organic-free seawater to obtain the adsorption capacity (gamma max) and the adsorption equilibrium coefficient (Kmesi) for the metal ion on the algal cells. The experimental data can be fitted by a two-site Langmuir isotherm which considers the presence of high and low affinity binding sites on the cell surface. The maximal adsorption capacity for Cu, Pb, Zn and Cd on the algal surface was 0.8, 0.6, 1.3 and 0.5x10-16 mol cell-1, respectively. Cu exhibits the higher affinity, owing to the higher values of both the adsorption equilibrium coefficient and the maximal adsorption capacity of the stronger Cu-binding sites. The capacity of the cell exudates of Phaeodactylom tricornutum to bind Cu, Pb, Zn and Cd was also measured, and the effect of algae as competing ligand for the metal ion bound to exudates was investigated. The results show that the metal-exudates complexes can be available for the adsorption process on the cell surface.
Subject Cell surface
Phaeodactylom tricornutum

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