Fig. 4From: Enzyme adsorption-induced activity changes: a quantitative study on TiO2 model agglomeratesATR-IR spectra of β-gal adsorbed on a porous film of TiO2 nanoparticles ([β-gal] = 150 µg mL−1, [TiO2] = 1.3 mg mL−1, adsorption time: 8 h), background spectrum: TiO2 film in contact with water. Following protein adsorption the film was extensively rinsed first with water and then with Na2HPO4 solutions ([Na2HPO4] = 1 and 10 mM, respectively)Back to article page