An EPR determination of copper complexation by excreted high molecular weight compounds of Ankistrodesmus densus (Chlorophyceae) |
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| Authors: | Henriques Vieira, Armando Augusto Nascimento, Otaciro Rangel |
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| Affiliation: | Federal University of S!["a"]("/math/amacr.gif") o Carlos, Biological Sciences Department Via Washington Luiz, Km 235, CEP 13560 1So Paulo University, Institute of Physics and Chemistry P. Box 369, CEP 13560, So Carlos, So Paulo, Brazil |
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| Abstract: | Electron paramagnetic resonance (EPR) spectra were obtainedfrom dialysed and dried samples of high mol. wt compounds (HMWC)excreted by Ankistrodesmus densus: precipitated with ethanol(A); ethanol soluble (B); and capsular material (C). The singlespectrum of A shows the existence of nitrogen coordination withcopper. The spectra of B show two distinct complexes: one similarto A and another without superhyperfine lines suggesting thepresence of oxygen ligands coordinated with ion. In C the spectraare similar to B with the concentration relation inverted. About20 µ g of ion is chelated by 1 mg of dried HMWC. |
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