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Titolo:
An in situ infrared spectroscopic investigation of lysine peptide and polylysine adsorption to TiO2 from aqueous solutions
Autore:
Roddick-Lanzilotta, AD; McQuillan, AJ;
Indirizzi:
Univ Otago, Dept Chem, Dunedin, New Zealand Univ Otago Dunedin New Zealand v Otago, Dept Chem, Dunedin, New Zealand
Titolo Testata:
JOURNAL OF COLLOID AND INTERFACE SCIENCE
fascicolo: 1, volume: 217, anno: 1999,
pagine: 194 - 202
SICI:
0021-9797(19990901)217:1<194:AISISI>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL-OXIDE SURFACES; PROTEIN ADSORPTION; COLLOIDAL DISPERSIONS; COADSORPTION; SPECTROMETRY; INTERFACE; MECHANISM; TITANIUM; ADHESION; CHARGE;
Keywords:
in situ ATR-IR; TiO2; adsorption; lysine peptides;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Roddick-Lanzilotta, AD Univ Otago, Dept Chem, POB 56, Dunedin, New ZealandUniv Otago POB 56 Dunedin New Zealand New Zealand
Citazione:
A.D. Roddick-Lanzilotta e A.J. McQuillan, "An in situ infrared spectroscopic investigation of lysine peptide and polylysine adsorption to TiO2 from aqueous solutions", J COLL I SC, 217(1), 1999, pp. 194-202

Abstract

An in situ infrared spectroscopic study of the adsorption of lysine peptides with n = 2-5 lysine units and polylysine (n = 169) on hydrous TiO2 particle films is reported. Using attenuated total reflection infrared spectroscopy, it was found that dilysine adsorption to negatively charged TiO2 from aqueous solutions pH 7.4 arose from electrostatic interactions. Increasing the number of lysine units to n = 3-5 resulted in infrared spectra which were changed, compared to solution species, upon adsorption to TiO2. This indicated that the carboxylate group was involved in the peptide/TiO2, interaction. Binding constants (K) for lysine peptide adsorption to TiO2 were calculated by applying the Langmuir isotherm model. The K values obtained supported the onset of a stronger peptide-TiO2, interaction going from dilysine to trilysine. Polylysine also adsorbed to TiO2 from aqueous pH 7.4 solutions. prolonged exposure of polylysine to TiO2 (16.5 h) resulted in changed infrared spectra, implying that the secondary structure of polylysine was affected by adsorption. In contrast,the lysine peptides and polylysine did notadsorb to the hydrophobic ZnSe surface or positively charged chromium(III)oxide-hydroxide films, under the same experimental conditions. This indicates that electrostatic interactions of the lysine peptides with the adsorbent are of main importance to adsorption. (C) 1999 Academic Press.

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Documento generato il 09/07/20 alle ore 18:00:22