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Chaubey SK, Kumar R, Lalaguna PL, Kartau M, Bianco S, Tabouillot V, Thomson AR, Sutherland A, Lyutakov O, Gadegaard N, Karimullah AS, Kadodwala M. Ultrasensitive Raman Detection of Biomolecular Conformation at the Attomole Scale using Chiral Nanophotonics. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2404536. [PMID: 39045909 DOI: 10.1002/smll.202404536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2024] [Revised: 07/08/2024] [Indexed: 07/25/2024]
Abstract
Understanding the function of a biomolecule hinges on its 3D conformation or secondary structure. Chirally sensitive, optically active techniques based on the differential absorption of UV-vis circularly polarized light excel at rapid characterisation of secondary structures. However, Raman spectroscopy, a powerful method for determining the structure of simple molecules, has limited capacity for structural analysis of biomolecules because of intrinsically weak optical activity, necessitating millimolar (mM) sample quantities. A breakthrough is presented for utilising Raman spectroscopy in ultrasensitive biomolecular conformation detection, surpassing conventional Raman optical activity by 15 orders of magnitude. This strategy combines chiral plasmonic metasurfaces with achiral molecular Raman reporters and enables the detection of different conformations (α-helix and random coil) of a model peptide (poly-L/D-lysine) at the ≤attomole level (monolayer). This exceptional sensitivity stems from the ability to detect local, molecular-scale changes in the electromagnetic (EM) environment of a chiral nanocavity induced by the presence of biomolecules using molecular Raman reporters. Further signal enhancement is achieved by incorporating achiral Au nanoparticles. The introduction of the nanoparticles creates highly localized regions of extreme optical chirality. This approach, which exploits Raman, a generic phenomenon, paves the way for next-generation technologies for the ultrasensitive detection of diverse biomolecular structures.
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Affiliation(s)
- Shailendra K Chaubey
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Rahul Kumar
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Paula L Lalaguna
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Martin Kartau
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Simona Bianco
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Victor Tabouillot
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Andrew R Thomson
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Andrew Sutherland
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Oleksiy Lyutakov
- Department of Solid-State Engineering, University of Chemistry and Technology, Prague, 16628, Czech Republic
| | - Nikolaj Gadegaard
- James Watt School of Engineering, Rankine Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Affar S Karimullah
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Malcolm Kadodwala
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
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Möllers PV, Göhler B, Zacharias H. Chirality Induced Spin Selectivity – the Photoelectron View. Isr J Chem 2022. [DOI: 10.1002/ijch.202200062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Paul V. Möllers
- Center for Soft Nanoscience University of Münster Busso-Peus-Str. 10 48149 Münster Germany
| | - Benjamin Göhler
- Center for Soft Nanoscience University of Münster Busso-Peus-Str. 10 48149 Münster Germany
| | - Helmut Zacharias
- Center for Soft Nanoscience University of Münster Busso-Peus-Str. 10 48149 Münster Germany
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Yeom B, Zhang H, Zhang H, Park JI, Kim K, Govorov AO, Kotov NA. Chiral plasmonic nanostructures on achiral nanopillars. NANO LETTERS 2013; 13:5277-83. [PMID: 24111695 DOI: 10.1021/nl402782d] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Chirality of plasmonic films can be strongly enhanced by three-dimensional (3D) out-of-plane geometries. The complexity of lithographic methods currently used to produce such structures and other methods utilizing chiral templates impose limitations on spectral windows of chiroptical effects, the size of substrates, and hence, further research on chiral plasmonics. Here we demonstrate 3D chiral plasmonic nanostructures (CPNs) with high optical activity in the visible spectral range based on initially achiral nanopillars from ZnO. We made asymmetric gold nanoshells on the nanopillars by vacuum evaporation at different inclination and rotation angles to achieve controlled symmetry breaking and obtained both left- and right-rotating isomers. The attribution of chiral optical effects to monolithic enantiomers made in this process was confirmed by theoretical calculations based on their geometry established from scanning electron microscope (SEM) images. The chirality of the nanoshells is retained upon the release from the substrate into a stable dispersion. Deviation of the incident angle of light from normal results in increase of polarization rotation and chiral g-factor as high as -0.3. This general approach for preparation of abiological nanoscale chiral materials can be extended to other out-of plane 3D nanostructures. The large area films made on achiral nanopillars are convenient for sensors, optical devices, and catalysis.
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Affiliation(s)
- Bongjun Yeom
- Departments of Chemical Engineering, University of Michigan , Ann Arbor, Michigan 48109, United States
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Abstract
The chiral-induced spin selectivity (CISS) effect was recently established experimentally and theoretically. Here, we review some of the new findings and discuss applications that can result from special properties of this effect, like the reduction of the elastic backscattering in electron transfer through chiral molecules. The CISS effect opens the possibility of using chiral molecules in spintronics applications and for providing a deeper understanding of spin-selective processes in biology.
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Affiliation(s)
- R Naaman
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - David H Waldeck
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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