caa a22 4500 605466629 CHVBK 20210128100308.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s00397-015-0857-8 doi (NATIONALLICENCE)springer-10.1007/s00397-015-0857-8 Changes in the rheology of nano-structured suspensions by adsorption of the protein α-lactalbumin on the surface of silica particles [Elektronische Daten] [Necla Eren, Owen Jones, Osvaldo Campanella] A rheological phenomenon associated to the adsorption of a soluble protein in the surface of silica nanoparticles is reported along the mechanisms that could explain it. Rheological behavior and structural relaxation of hydrophilic fumed silica suspensions in the absence and presence of α-lactalbumin were studied at pH values 2, 4, and 6 using rheological tests and dynamic light scattering (DLS). The addition of α-lactalbumin caused an increase in viscosity and elasticity of the samples at pHs 2 and 4, whereas an opposite effect was observed at pH 6. Structural relaxation of the nanoparticles forming the suspensions slowed down upon protein addition at pHs 2 and 4 but did not change significantly at pH 6. Changes in rheological properties and structural relaxation were attributed to electrostatic interactions induced by the changes in the silica surface charges at the different pH studied; also by perturbation of the short-range interactions (pH 2), protein bridging (pH 4) and better dispersion of particles (pH 6). Springer-Verlag Berlin Heidelberg, 2015 Viscoelasticity nationallicence Structural relaxation nationallicence Protein adsorption nationallicence Protein bridging nationallicence Eren Necla Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA aut Jones Owen Whistler Center for Carbohydrate Research, West Lafayette, IN, USA aut Campanella Osvaldo Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA aut Rheologica Acta Springer Berlin Heidelberg 54/8(2015-08-01), 735-744 0035-4511 54:8<735 2015 54 397 https://doi.org/10.1007/s00397-015-0857-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0857-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Eren Necla Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA aut NATIONALLICENCE 700 1- Jones Owen Whistler Center for Carbohydrate Research, West Lafayette, IN, USA aut NATIONALLICENCE 700 1- Campanella Osvaldo Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/8(2015-08-01), 735-744 0035-4511 54:8<735 2015 54 397