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Yan H, Cacioppo M, Megahed S, Arcudi F, Đorđević L, Zhu D, Schulz F, Prato M, Parak WJ, Feliu N. Influence of the chirality of carbon nanodots on their interaction with proteins and cells. Nat Commun 2021; 12:7208. [PMID: 34893594 PMCID: PMC8664908 DOI: 10.1038/s41467-021-27406-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 11/11/2021] [Indexed: 12/26/2022] Open
Abstract
Carbon nanodots with opposite chirality possess the same major physicochemical properties such as optical features, hydrodynamic diameter, and colloidal stability. Here, a detailed analysis about the comparison of the concentration of both carbon nanodots is carried out, putting a threshold to when differences in biological behavior may be related to chirality and may exclude effects based merely on differences in exposure concentrations due to uncertainties in concentration determination. The present study approaches this comparative analysis evaluating two basic biological phenomena, the protein adsorption and cell internalization. We find how a meticulous concentration error estimation enables the evaluation of the differences in biological effects related to chirality.
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Affiliation(s)
- Huijie Yan
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universitat Hamburg, 22607, Hamburg, Germany
| | - Michele Cacioppo
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universitat Hamburg, 22607, Hamburg, Germany
- Department of Chemical and Pharmaceutical Sciences, INSTM UdR Trieste, University of Trieste, Via Licio Giorgieri 1, 34127, Trieste, Italy
| | - Saad Megahed
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universitat Hamburg, 22607, Hamburg, Germany
- Physics Department, Faculty of Science, Al-Azhar University, Cairo, Egypt
| | - Francesca Arcudi
- Department of Chemical and Pharmaceutical Sciences, INSTM UdR Trieste, University of Trieste, Via Licio Giorgieri 1, 34127, Trieste, Italy
| | - Luka Đorđević
- Department of Chemical and Pharmaceutical Sciences, INSTM UdR Trieste, University of Trieste, Via Licio Giorgieri 1, 34127, Trieste, Italy
| | - Dingcheng Zhu
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universitat Hamburg, 22607, Hamburg, Germany
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, PR China
| | - Florian Schulz
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universitat Hamburg, 22607, Hamburg, Germany
| | - Maurizio Prato
- Department of Chemical and Pharmaceutical Sciences, INSTM UdR Trieste, University of Trieste, Via Licio Giorgieri 1, 34127, Trieste, Italy.
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014, Donostia San Sebastian, Spain.
- Basque Foundation for Science, Ikerbasque, 48013, Bilbao, Spain.
| | - Wolfgang J Parak
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universitat Hamburg, 22607, Hamburg, Germany.
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014, Donostia San Sebastian, Spain.
| | - Neus Feliu
- Fachbereich Physik, Center for Hybrid Nanostructures (CHyN), Universitat Hamburg, 22607, Hamburg, Germany.
- Fraunhofer Center for Applied Nanotechnology (CAN), 20146, Hamburg, Germany.
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Depletion-Induced Chiral Chain Formation of Magnetic Spheres. MATERIALS 2021; 14:ma14030507. [PMID: 33494424 PMCID: PMC7865936 DOI: 10.3390/ma14030507] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/15/2021] [Accepted: 01/18/2021] [Indexed: 01/02/2023]
Abstract
Experimental evidence is presented for the spontaneous formation of chiral configurations in bulk dispersions of magnetized colloids that interact by a combination of anisotropic dipolar interactions and isotropic depletion attractions. The colloids are superparamagnetic silica spheres, magnetized and aligned by a carefully tuned uniform external magnetic field; isotropic attractions are induced by using poly(ethylene oxide) polymers as depleting agents. At specific polymer concentrations, sphere chains wind around each other to form helical structures–of the type that previously have only been observed in simulations on small sets of unconfined dipolar spheres with additional isotropic interactions.
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