A voltammetric study of copper-ion binding to the cell surface of the marine alga

Scarano, Gioacchino; Morelli, Elisabetta

doi:10.1080/09542299.1993.11083213

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…Surfaces of living particles, e.g. algae and bacteria, are characterized by various sites capable to adsorb metal ions with high affinity [3][4][5][6] and, in aquatic systems, can provide a large area for adsorption of heavy metals from the surrounding environment.…”

Section: Introductionmentioning

confidence: 99%

Binding of Cu, Pb, Zn and Cd to the cell surface of the marine diatomPhaeodactylum tricornutum

Scarano¹,

Morelli

1999

Toxicological & Environmental Chemistry

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The binding of Cu, Pb, Zn and Cd to the cell surface of the marine alga Phaeodactylum tricornutum was studied in organic-free seawater to obtain the adsorption capacity (F max ) and the adsorption equilibrium coefficient (K MES ,) 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 O.5 x 10 -16 molcell -l, 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 capability of cell exudates of Phaeodactylum 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.

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Section: Introductionmentioning

confidence: 99%

Binding of Cu, Pb, Zn and Cd to the cell surface of the marine diatomPhaeodactylum tricornutum

Scarano¹,

Morelli

1999

Toxicological & Environmental Chemistry

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Atomic Spectrometry Updates—References

1995

J. Anal. At. Spectrom.

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Cadmium induced phytochelatins in marine algaPhaeodactylum tricornutum:effect of metal speciation

Morelli

Scarano

1995

Chemical Speciation & Bioavailability

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The production of phytochelatins (PCs) in the marine diatom Phaeodactylum tricornutum in response to cadmium has been studied as a function of the exposure time, concentration and chemical speciation. The results agree with the role of PCs in the detoxification and homeostasis of Cd in this alga. The chemical speciation of the metal was found to influence the synthesis of PCs. The use of Cd ion buffer solutions shows that the induction of PCs is controlled by the free ion rather than by the total or chelated Cd in solution.

show abstract

A voltammetric study of copper-ion binding to the cell surface of the marine alga

Cited by 3 publications

References 12 publications

Binding of Cu, Pb, Zn and Cd to the cell surface of the marine diatomPhaeodactylum tricornutum

Binding of Cu, Pb, Zn and Cd to the cell surface of the marine diatomPhaeodactylum tricornutum

Atomic Spectrometry Updates—References

Cadmium induced phytochelatins in marine algaPhaeodactylum tricornutum:effect of metal speciation

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