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Tukova A, Tavakkoli Yaraki M, Rodger A, Wang Y. Shape-Induced Variations in Aromatic Thiols Adsorption on Gold Nanoparticle: A Novel Method for Accurate Evaluation of Adsorbed Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:15828-15836. [PMID: 37901970 DOI: 10.1021/acs.langmuir.3c02563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2023]
Abstract
Nonspherical gold nanoparticles (GNPs) are increasingly used to enhance sensitivity and selectivity in analytical methods such as surface-enhanced Raman spectroscopy (SERS) for detecting trace biomarkers. However, there is limited research on the adsorption properties of aromatic thiols onto gold nanoparticles of different morphologies, where surface curvature varies significantly at the molecular level. In this study, we investigated the adsorption kinetics of 4-mercaptobenzoic acid, an aromatic molecule, on GNPs with different shapes using SERS. Our findings revealed significant differences in the adsorption behavior and binding site preferences of aromatic thiols on GNPs with distinct morphologies. While thiol molecules consider any surface site on nanospheres equally appealing, nanostars exhibit variations in curvature and surface energy, leading to initial binding with further repositioning from the tips of the nanostar after plasmon activation. To address these differences, we proposed a universal method to evaluate the quantity of tightly bound adsorbed molecules on GNPs independently of the particle size, shape, or concentration.
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Affiliation(s)
- Anastasiia Tukova
- School of Natural Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109, Australia
| | - Mohammad Tavakkoli Yaraki
- School of Natural Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109, Australia
| | - Alison Rodger
- School of Natural Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109, Australia
- Australian Research Council Industrial Transformation Training Centre for Facilitated Advancement of Australia's Bioactives (FAAB), Sydney, NSW 2109, Australia
| | - Yuling Wang
- School of Natural Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, NSW 2109, Australia
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The Influence of the Recording Time in Modelling the Swimming Behaviour of the Freshwater Inbenthic Copepod Bryocamptus pygmaeus. WATER 2022. [DOI: 10.3390/w14131996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The analysis of copepod behaviour gained an increasing impetus over the past decade thanks to the advent of computer-assisted video analysis tools. Since the automated tracking consists in detecting the animal’s position frame by frame and improving signals corrupted by strong background noise, a crucial role is played by the length of the video recording. The aim of this study is to: (i) assess whether the recording time influences the analysis of a suite of movement descriptive parameters; (ii) understand if the recording time influences the outcome of the statistical analyses when hypotheses on the effect of toxicants/chemicals on the freshwater invertebrate behaviour are tested. We investigated trajectory parameters commonly used in behavioural studies—swimming speed, percentage of activity and trajectory convex hull—derived from the trajectories described by the inbenthic–interstitial freshwater copepod Bryocamptus pygmaeus exposed to a sub-lethal concentration of diclofenac. The analyses presented in this work indicate that the recording time did not influence the outcome of the results for the swimming speed and the percentage of activity. For the trajectory convex hull area, our results showed that a recording session lasting at least 3 min provided robust results. However, further investigations are needed to disentangle the role of concurrent factors, such as the behavioural analysis of multiple individuals simultaneously, whether they are of the same or opposite sex and the implications on sexual behaviour, competition for resources and predation.
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Peters R, Elbers I, Undas A, Sijtsma E, Briffa S, Carnell-Morris P, Siupa A, Yoon TH, Burr L, Schmid D, Tentschert J, Hachenberger Y, Jungnickel H, Luch A, Meier F, Kocic J, Kim J, Park BC, Hardy B, Johnston C, Jurkschat K, Radnik J, Hodoroaba VD, Lynch I, Valsami-Jones E. Benchmarking the ACEnano Toolbox for Characterisation of Nanoparticle Size and Concentration by Interlaboratory Comparisons. Molecules 2021; 26:molecules26175315. [PMID: 34500752 PMCID: PMC8433974 DOI: 10.3390/molecules26175315] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 08/27/2021] [Accepted: 08/28/2021] [Indexed: 11/16/2022] Open
Abstract
ACEnano is an EU-funded project which aims at developing, optimising and validating methods for the detection and characterisation of nanomaterials (NMs) in increasingly complex matrices to improve confidence in the results and support their use in regulation. Within this project, several interlaboratory comparisons (ILCs) for the determination of particle size and concentration have been organised to benchmark existing analytical methods. In this paper the results of a number of these ILCs for the characterisation of NMs are presented and discussed. The results of the analyses of pristine well-defined particles such as 60 nm Au NMs in a simple aqueous suspension showed that laboratories are well capable of determining the sizes of these particles. The analysis of particles in complex matrices or formulations such as consumer products resulted in larger variations in particle sizes within technologies and clear differences in capability between techniques. Sunscreen lotion sample analysis by laboratories using spICP-MS and TEM/SEM identified and confirmed the TiO2 particles as being nanoscale and compliant with the EU definition of an NM for regulatory purposes. In a toothpaste sample orthogonal results by PTA, spICP-MS and TEM/SEM agreed and stated the TiO2 particles as not fitting the EU definition of an NM. In general, from the results of these ILCs we conclude that laboratories are well capable of determining particle sizes of NM, even in fairly complex formulations.
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Affiliation(s)
- Ruud Peters
- Wageningen Food Safety Research, Wageningen University & Research, Akkermaalsbos 2, 6708 WB Wageningen, The Netherlands; (I.E.); (A.U.); (E.S.)
- Correspondence:
| | - Ingrid Elbers
- Wageningen Food Safety Research, Wageningen University & Research, Akkermaalsbos 2, 6708 WB Wageningen, The Netherlands; (I.E.); (A.U.); (E.S.)
| | - Anna Undas
- Wageningen Food Safety Research, Wageningen University & Research, Akkermaalsbos 2, 6708 WB Wageningen, The Netherlands; (I.E.); (A.U.); (E.S.)
| | - Eelco Sijtsma
- Wageningen Food Safety Research, Wageningen University & Research, Akkermaalsbos 2, 6708 WB Wageningen, The Netherlands; (I.E.); (A.U.); (E.S.)
| | - Sophie Briffa
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK; (S.B.); (I.L.); (E.V.-J.)
| | - Pauline Carnell-Morris
- Malvern Panalytical, Enigma Business Park, Grovewood Road, Malvern, Worcestershire WR14 1XZ, UK; (P.C.-M.); (A.S.)
| | - Agnieszka Siupa
- Malvern Panalytical, Enigma Business Park, Grovewood Road, Malvern, Worcestershire WR14 1XZ, UK; (P.C.-M.); (A.S.)
| | - Tae-Hyun Yoon
- Department of Chemistry, College of Natural Sciences, Hanyang University, Seoul 04763, Korea;
- Institute of Next Generation Material Design, Hanyang University, Seoul 04763, Korea
| | - Loïc Burr
- CSEM, Centre Suisse d’Electronique et de Microtechnique SA, Bahnhofstrasse 1, 7302 Lanfquart, Switzerland; (L.B.); (D.S.)
| | - David Schmid
- CSEM, Centre Suisse d’Electronique et de Microtechnique SA, Bahnhofstrasse 1, 7302 Lanfquart, Switzerland; (L.B.); (D.S.)
| | - Jutta Tentschert
- German Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany; (J.T.); (Y.H.); (H.J.); (A.L.)
| | - Yves Hachenberger
- German Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany; (J.T.); (Y.H.); (H.J.); (A.L.)
| | - Harald Jungnickel
- German Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany; (J.T.); (Y.H.); (H.J.); (A.L.)
| | - Andreas Luch
- German Federal Institute for Risk Assessment (BfR), Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany; (J.T.); (Y.H.); (H.J.); (A.L.)
| | - Florian Meier
- Postnova Analytics GmbH, Rankine-Str. 1, 86899 Landsberg, Germany;
| | - Jovana Kocic
- Department of Chemistry and Applied Biosciences ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland;
| | - Jaeseok Kim
- Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea; (J.K.); (B.C.P.)
| | - Byong Chon Park
- Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea; (J.K.); (B.C.P.)
| | - Barry Hardy
- Edelweiss Connect GmbH, Technology Park Basel, Hochbergerstrasse 60C, 4057 Basel, Switzerland;
| | - Colin Johnston
- Department of Materials, University of Oxford, Begbroke Science Park, Begbroke Hill, Oxford OX5 1PF, UK; (C.J.); (K.J.)
| | - Kerstin Jurkschat
- Department of Materials, University of Oxford, Begbroke Science Park, Begbroke Hill, Oxford OX5 1PF, UK; (C.J.); (K.J.)
| | - Jörg Radnik
- Bundesanstalt für Materialforschung und-prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany; (J.R.); (V.-D.H.)
| | - Vasile-Dan Hodoroaba
- Bundesanstalt für Materialforschung und-prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany; (J.R.); (V.-D.H.)
| | - Iseult Lynch
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK; (S.B.); (I.L.); (E.V.-J.)
| | - Eugenia Valsami-Jones
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK; (S.B.); (I.L.); (E.V.-J.)
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