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Université de Fribourg

Modeling analysis of ultrasonic attenuation and angular scattering measurements of suspended particles

Fleckenstein, Peter ; Storti, Giuseppe ; Deschwanden, Fabian ; Gruber, Peter ; Lattuada, Marco

In: The Journal of the Acoustical Society of America, 2018, vol. 143, no. 2, p. 1049–1063

A combination of two models previously developed by Faran, and Atkinson and Kytömaa (Faran-AK model) was used to calculate the ultrasonic attenuation and the backscattering signal of a suspension of particles. The model of Atkinson and Kytömaa yielded the viscoelastic contributions while the model of Faran yielded the scattering contribution. A comparison with the more fundamental model by...

Université de Fribourg

Triggered metal ion release and oxidation: ferrocene as a mechanophore in polymers

Giannantonio, Michela Di ; Ayer, Mathieu A. ; Verde-Sesto, Ester ; Lattuada, Marco ; Weder, Christoph ; Fromm, Katharina M.

In: Angewandte Chemie International Edition, 2018, vol. 57, no. 35, p. 11445–11450

The introduction of mechanophores into polymers makes it possible to transduce mechanical forces into chemical reactions that can be used to impart functions such as self‐healing, catalytic activity, and mechanochromic response. Here, an example of mechanically induced metal ion release from a polymer is reported. Ferrocene (Fc) was incorporated as an iron ion releasing mechanophore into...

Université de Fribourg

Mononuclear silver(I) complexes with 1,7-phenanthroline as potent inhibitors of Candida growth

Savić, Nada D. ; Vojnovic, Sandra ; Glišić, Biljana Đ. ; Crochet, Aurélien ; Pavic, Aleksandar ; Janjić, Goran V. ; Pekmezović, Marina ; Opsenica, Igor M. ; Fromm, Katharina M. ; Nikodinovic-Runic, Jasmina ; Djuran, Miloš I.

In: European Journal of Medicinal Chemistry, 2018, vol. 156, p. 760–773

Mononuclear silver(I) complexes with 1,7-phenanthroline (1,7-phen), [Ag(NO3-O,O′) (1,7-phen-N7)2] (1) and [Ag(1,7-phen-N7)2]X, X = ClO4− (2), CF3SO3− (3), BF4− (4) and SbF6− (5) were synthesized and structurally characterized by NMR (1H and 13C), IR and UV–Vis spectroscopy and ESI mass spectrometry. The crystal structures of 1, 3 and 4 were determined by single-crystal X-ray...

Université de Fribourg

Alpha-helical folding of SilE models upon Ag(His)(Met) motif formation

Chabert, Valentin ; Hologne, Maggy ; Sénèque, Olivier ; Walker, Olivier ; Fromm, Katharina M.

In: Chemical Communications, 2018, vol. 54, no. 74, p. 10419–10422

The SilE protein is suspected to have a prominent role in Ag+ detoxification of silver resistant bacteria. Using model peptides, we elucidated both qualitative and quantitative aspects of the Ag+-induced α-helical structuring role of His- and Met-rich sequences of SilE, improving our understanding of its function within the Sil system.

Université de Fribourg

Single exposure to aerosolized graphene oxide and graphene nanoplatelets did not initiate an acute biological response in a 3D human lung model

Drasler, Barbara ; Kucki, Melanie ; Delhaes, Flavien ; Buerki-Thurnherr, Tina ; Vanhecke, Dimitri ; Korejwo, Daria ; Chortare, Savvina ; Barosova, Hana ; Hirsch, Cordula ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara ; Wick, Peter

In: Carbon, 2018, vol. 137, p. 125–135

The increased mass production of graphene related materials (GRM), intended for a broad spectrum of applications, demands a thorough assessment of their potential hazard to humans and the environment. Particularly, the paramount concern has been expressed in regard to their interaction with the respiratory system in occupational exposure settings. It has been shown that GRM are easily...

Université de Fribourg

A rational and iterative process for targeted nanoparticle design and validation

Rodriguez-Lorenzo, Laura ; D.Rafiee, Sarah ; Reis, Corine ; Milosevic, Ana ; L.Moore, Thomas ; Balog, Sandor ; Rothen-Rutishauser, Barbara ; Ruegg, Curzio ; Petri-Fink, Alke

In: Colloids and Surfaces B: Biointerfaces, 2018, vol. 171, p. 579–589

The lack of understanding of fundamental nano-bio interactions, and difficulties in designing particles stable in complex biological environments are major limitations to their translation into biomedical clinical applications. Here we present a multi- parametric approach to fully characterize targeted nanoparticles, and emphasizes the significant effect that each detail in the synthetic...

Université de Fribourg

Mimicking the chemistry of natural eumelanin synthesis: the ke sequence in polypeptides and in proteins allows for a specific control of nanosized functional polydopamine formation

Bergtold, Camille ; Hauser, Daniel ; Alain Chaumont ; El Yakhlifi, Salima ; Mateescu, Mihaela ; Meyer, Florent ; Metz-Boutigue, Marie-Hélène ; Benoît Frisch ; Schaaf, Pierre ; Ihiawakrim, Dris ; Ersen, Ovidiu ; Monnier, Christophe A. ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara ; Ball, Vincent

In: Biomacromolecules, 2018, vol. 19, no. 9, p. 3693–3704

The oxidation of dopamine and of other catecholamines leads to the formation of conformal films on the surface of all known materials and to the formation of a precipitate in solution. In some cases, it has been shown that the addition of additives in the dopamine solution, like certain surfactants or polymers, polyelectrolytes, and certain proteins, allows to get polydopamine nanoparticles...

Université de Fribourg

Carbon nanodots: Opportunities and limitations to study their biodistribution at the human lung epithelial tissue barrier

Durantie, Estelle ; Barosova, Hana ; Drasler, Barbara ; Rodriguez-Lorenzo, Laura ; Urban, Dominic A. ; Vanhecke, Dimitri ; Septiadi, Dedy ; Hirschi-Ackermann, Liliane ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara

In: Biointerphases, 2018, vol. 13, no. 6, p. 06D404

Inhalation of combustion-derived ultrafine particles (≤0.1 μm) has been found to be associated with pulmonary and cardiovascular diseases. However, correlation of the physicochemical properties of carbon-based particles such as surface charge and agglomeration state with adverse health effects has not yet been established, mainly due to limitations related to the detection of carbon...

Université de Fribourg

DFT investigation of methane metathesis with L2AnCH3 actinide complexes catalysts (L = Cl, Cp, Cp*; An = Ac, Th, Pa, U, Np, Pu)

Talbi-Ingrachen, Fazia ; Talbi, Fatiha ; Kias, Farida ; Elkechai, Aziz ; Boucekkine, Abdou ; Daul, Claude

In: Computational and Theoretical Chemistry, 2018, vol. 1138, p. 123–134

In order to understand the catalytic activity of the actinide complexes L2AnCH3 (An = Ac, Th, Pa, U, Np and Pu; L = Cl, Cp and Cp∗) towards the activation of the CH bond of methane, relativistic ZORA/DFT investigations have been carried out. The results obtained from Linear Transit (LT) and Intrinsic Reaction Coordinate (IRC) calculations show that the mechanism involved in these...