Université de Fribourg

Assessment of the potential for in-plume sulphur dioxide gas-ash interactions to influence the respiratory toxicity of volcanic ash

Tomašek, Ines ; Damby, David E. ; Horwell, Claire J. ; Ayris, Paul M. ; Delmelle, Pierre ; Ottley, Christopher J. ; Cubillas, Pablo ; Casas, Ana S. ; Bisig, Christoph ; Petri-Fink, Alke ; Dingwell, Donald B. ; Clift, Martin J. D. ; Drasler, Barbara ; Rothen-Rutishauser, Barbara

In: Environmental Research, 2019, vol. 179, p. 108798

Volcanic plumes are complex environments composed of gases and ash particles, where chemical and physical processes occur at different temperature and compositional regimes. Commonly, soluble sulphate- and chloride-bearing salts are formed on ash as gases interact with ash surfaces. Exposure to respirable volcanic ash following an eruption is potentially a significant health concern. The...

Université de Fribourg

Combined exposure of diesel exhaust particles and respirable Soufrière Hills volcanic ash causes a (pro-)inflammatory response in an in vitro multicellular epithelial tissue barrier model

Tomašek, Ines ; Horwell, Claire J. ; Damby, David E. ; Barošová, Hana ; Geers, Christoph ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara ; Clift, Martin J. D.

In: Particle and Fibre Toxicology, 2016, vol. 13, p. 67

There are justifiable health concerns regarding the potential adverse effects associated with human exposure to volcanic ash (VA) particles, especially when considering communities living in urban areas already exposed to heightened air pollution. The aim of this study was, therefore, to gain an imperative, first understanding of the biological impacts of respirable VA when exposed...

Université de Fribourg

Synthesis, characterization, antibacterial activity and cytotoxicity of hollow /TiO₂-coated CeO₂ nanocontainers encapsulating silver nanoparticles for controlled silver release

Gagnon, Jacinthe ; Clift, Martin J. D. ; Vanhecke, Dimitri ; Widnersson, I. E. ; Abram, S.-L. ; Petri-Fink, Alke ; Caruso, R. A. ; Rothen-Rutishauser, Barbara ; Fromm, Katharina M.

In: Journal of Materials Chemistry B, 2016, vol. 4, no. 6, p. 1166–1174

Biomaterials as implants are being applied more extensively in medicine due to their on-going development and associated improvements, and the increase in human life expectancy. Nonetheless, biomaterial-related infections, as well as propagating bacterial resistance, remain significant issues. Therefore, there is a growing interest for silver-based drugs because of their efficient and broad-range...

Université de Fribourg

Integrating silver compounds and nanoparticles into ceria nanocontainers for antimicrobial applications

Gagnon, Jacinthe ; Clift, Martin J. D. ; Vanhecke, Dimitri ; Kuhn, Dagmar Alice ; Weber, P. ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara ; Fromm, Katharina M.

In: Journal of Materials Chemistry B, 2015, vol. 3, no. 9, p. 1760–1768

Silver compounds and nanoparticles (NPs) are gaining increasing interest in medical applications, specifically in the treatment and prevention of biomaterial-related infections. However, the silver release from these materials, resulting in a limited antimicrobial activity, is often difficult to control. In this paper, ceria nanocontainers were synthesized by a template-assisted method and were...

Université de Fribourg

Fate of cellulose nanocrystal aerosols deposited on the lung cell surface in vitro

Endes, Carola ; Mueller, Silvana ; Kinnear, Calum ; Vanhecke, Dimitri ; Foster, E. Johan ; Petri-Fink, Alke ; Weder, Christoph ; Clift, Martin J. D. ; Rothen-Rutishauser, Barbara

In: Biomacromolecules, 2015, vol. 16, no. 4, p. 1267–1275

When considering the inhalation of high-aspect ratio nanoparticles (HARN), the characterization of their specific interaction with lung cells is of fundamental importance to help categorize their potential hazard. The aim of the present study was to assess the interaction of cellulose nanocrystals (CNCs) with a multicellular in vitro model of the epithelial airway barrier following realistic...

Université de Fribourg

A biological perspective toward the interaction of theranostic nanoparticles with the bloodstream – what needs to be considered?

Clift, Martin J. D. ; Dechézelles, Jean-François ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke

In: Chemical Engineering, 2015, vol. 3, p. 7

Nanomedicine intends to create and further use novel materials at the nanoscale in order to provide an improvement upon current medical applications for human healthcare (ESF, 2005; Etheridge et al., 2013). In line with the advances made within nanotechnology since the late twentieth century (Mamalis, 2007) nanomedicine has received heightened attention due to its potential advantages, most...

Université de Fribourg

Modeling nanoparticle–alveolar epithelial cell interactions under breathing conditions using captive bubble surfactometry

Schürch, David ; Vanhecke, Dimitri ; Clift, Martin J. D. ; Raemy, David ; Aberasturi, Dorleta Jimenez de ; Parak, Wolfgang J. ; Gehr, Peter ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara

In: Langmuir, 2014, vol. 30, no. 17, p. 4924–4932

Many advances have been made in recent years in cell culture models of the epithelial barrier of the lung from simple monolayers to complex 3-D systems employing different cell types. However, the vast majority of these models still present a static air–liquid interface which is unrealistic given the dynamic nature of breathing. We present here a method where epithelial lung cells are...

Université de Fribourg

Can the Ames test provide an insight into nano-object mutagenicity? Investigating the interaction between nano-objects and bacteria

Clift, Martin J. D. ; Raemy, David O. ; Endes, Carola ; Ali, Zulqurnain ; Lehmann, Andrea D. ; Brandenberger, Christina ; Petri-Fink, Alke ; Wick, Peter ; Parak, Wolfgang J. ; Gehr, Peter ; Schins, Roel P. F. ; Rothen-Rutishauser, Barbara

In: Nanotoxicology, 2013, vol. 7, no. 8, p. 1373–1385

The aim of this study was to assess the interaction of a series of well characterised nano-objects with the Gram negative bacterium Salmonella typhimurium, and how such an interaction may relate to the potential mutagenicity of nano-objects. Transmission electron microscopy showed that nano-objects (Au-PMA-ATTO NPs, CeO₂ NPs, SWCNTs and MWCNTs), as well as CAFs entered S....

Université de Fribourg

Risk assessment of released cellulose nanocrystals – mimicking inhalatory exposure

Endes, Carola ; Müller, S. ; Schmid, O. ; Vanhecke, Dimitri ; Foster, E. Johan ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara ; Weder, Christoph ; Clift, Martin J. D.

In: Journal of Physics: Conference Series, 2013, vol. 429, no. 1, p. 012008

Cellulose nanocrystals (CNCs) exhibit advantageous chemical and mechanical properties that render them attractive for a wide range of applications. During the life-cycle of CNC containing materials the nanocrystals could be released and become airborne, posing a potential inhalatory exposure risk towards humans. Absent reliable and dose-controlled models that mimic this exposure in situ is a...