1
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Romolini G, Cerretani C, Rück V, Liisberg MB, Mollerup CB, Vosch T. Analytical method for the determination of the absorption coefficient of DNA-stabilized silver nanoclusters. NANOSCALE 2024; 16:12559-12566. [PMID: 38888625 DOI: 10.1039/d4nr01765j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
DNA-stabilized silver nanoclusters (DNA-AgNCs) are biocompatible emitters formed by silver atoms and cations encapsulated in DNA oligomers. Here, we present an analytical approach to calculate the molar absorption coefficient (ε) of these systems, which consists of combining UV-Vis spectroscopy, electrospray ionization-mass spectrometry (ESI-MS), and inductively coupled plasma-optical emission spectrometry (ICP-OES). ESI-MS enables the determination of the number of silvers bound to the DNA strands, whereas ICP-OES allows measurement of the total amount of silver in solution. The data is used to calculate the concentration of DNA-AgNCs and together with UV-Vis absorbance, allows for the calculation of ε. We compare the obtained ε with the experimental values previously determined through fluorescence correlation spectroscopy (FCS) and theoretical estimates based on the ε of the DNA itself. Finally, the experimental radiative decay rates (kf) and ε values are evaluated and compared to those typically found for organic fluorophores, highlighting the molecular-like nature of the DNA-AgNC emission.
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Affiliation(s)
- Giacomo Romolini
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
| | - Cecilia Cerretani
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
| | - Vanessa Rück
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
| | - Mikkel Baldtzer Liisberg
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
| | - Christian Brinch Mollerup
- Department of Forensic Medicine, University of Copenhagen, Frederik V's Vej 11, DK-2100 Copenhagen, Denmark
| | - Tom Vosch
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark.
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2
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Liisberg MB, Vosch T. Fluorescence Screening of DNA-AgNCs with Pulsed White Light Excitation. NANO LETTERS 2024; 24:7987-7991. [PMID: 38905483 PMCID: PMC11229690 DOI: 10.1021/acs.nanolett.4c01561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 06/17/2024] [Accepted: 06/18/2024] [Indexed: 06/23/2024]
Abstract
DNA-stabilized silver nanoclusters (DNA-AgNCs) are a class of fluorophores with interesting photophysical properties dominated by the choice of DNA sequence. Screening methods with ultraviolet excitation and steady state well plate readers have previously been used for deepening the understanding between DNA sequence and emission color of the resulting DNA-AgNCs. Here, we present a new method for screening DNA-AgNCs by using pulsed white light excitation (λex ≈ 490-900 nm). By subtraction and time gating we are able to circumvent the dominating scatter of the white excitation light and extract both temporally and spectrally resolved emission of DNA-AgNCs over the visible to near-infrared range. Additionally, we are able to identify weak long-lived emission, which is often buried underneath the intense nanosecond fluorescence. This new approach will be useful for future screening of DNA-AgNCs (or other novel emissive materials) and aid machine-learning models by providing a richer training data set.
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Affiliation(s)
- Mikkel Baldtzer Liisberg
- Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Tom Vosch
- Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
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3
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Malola S, Häkkinen H. On transient absorption and dual emission of the atomically precise, DNA-stabilized silver nanocluster Ag 16Cl 2. Chem Commun (Camb) 2024; 60:3315-3318. [PMID: 38426876 DOI: 10.1039/d3cc06085c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
DNA-stabilized silver nanoclusters with 10 to 30 silver atoms are interesting biocompatible nanomaterials with intriguing fluorescence properties. However, they are not well understood, since atom-scale high level theoretical calculations have not been possible due to a lack of firm experimental structural information. Here, by using density functional theory (DFT), we study the recently atomically resolved (DNA)2-Ag16Cl2 nanocluster in solvent under the lowest-lying singlet (S1) and triplet (T1) excited states, estimate the relative emission maxima for the allowed (S1 → S0) and dark (T1 → S0) transitions, and evaluate the transient absorption spectra. Our results offer a potential interpretation of the recently reported transient absorption and dual emission of similar DNA-stabilized silver nanoclusters, providing a mechanistic view on their photophysical properties that are attractive for applications in biomedical imaging and biophotonics.
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Affiliation(s)
- Sami Malola
- Department of Physics, Nanoscience Center, University of Jyväskylä, Jyväskylä FI-40014, Finland.
| | - Hannu Häkkinen
- Department of Physics, Nanoscience Center, University of Jyväskylä, Jyväskylä FI-40014, Finland.
- Department of Chemistry, Nanoscience Center, University of Jyväskylä, Jyväskylä FI-40014, Finland
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4
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Setzler C, Arrington CA, Lewis D, Petty JT. Breaching the Fortress: Photochemistry of DNA-Caged Ag 106. J Phys Chem B 2023; 127:10851-10860. [PMID: 38054435 PMCID: PMC10749453 DOI: 10.1021/acs.jpcb.3c06358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 11/26/2023] [Accepted: 11/27/2023] [Indexed: 12/07/2023]
Abstract
A DNA strand can encapsulate a silver molecule to create a nanoscale, aqueous stable chromophore. A protected cluster that strongly fluoresces can also be weakly photolabile, and we describe the laser-driven photochemistry of the green fluorophore C4AC4TC3GT4/Ag106+. The embedded cluster is selectively photoexcited at 490 nm and then bleached, and we describe how the efficiency, products, and route of this photochemical reaction are controlled by the DNA cage. With irradiation at 496.5 nm, the cluster absorption progressively drops to give a photodestruction quantum yield of 1.5 (±0.2) × 10-4, ∼103× less efficient than fluorescence. A new λabs = 335 nm chromophore develops because the precursor with 4 Ag0 is converted into a group of clusters with 2 Ag0 - Ag64+, Ag75+, Ag86+, and Ag97+. The 4-7 Ag+ in this series are chemically distinct from the 2 Ag0 because they are selectively etched by iodide. This halide precipitates silver to favor only the smallest Ag64+ cluster, but the larger clusters re-develop when the precipitated Ag+ ions are replenished. DNA-bound Ag106+ decomposes because it is electronically excited and then reacts with oxygen. This two-step process may be state-specific because O2 quenches the red luminescence from Ag106+. However, the rate constant of 2.3 (±0.2) × 106 M-1 s-1 is relatively small, which suggests that the surrounding DNA matrix hinders O2 diffusion. On the basis of analogous photoproducts with methylene blue, we propose that a reactive oxygen species is produced and then oxidizes Ag106+ to leave behind a loose Ag+-DNA skeleton. These findings underscore the ability of DNA scaffolds to not only tune the spectra but also guide the reactions of their molecular silver adducts.
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Affiliation(s)
- Caleb
J. Setzler
- Department
of Chemistry, Furman University, Greenville, South Carolina 29163, United States
| | - Caleb A. Arrington
- Department
of Chemistry, Wofford College, Spartanburg, South Carolina 29303, United States
| | - David Lewis
- Department
of Chemistry, Furman University, Greenville, South Carolina 29163, United States
| | - Jeffrey T. Petty
- Department
of Chemistry, Furman University, Greenville, South Carolina 29163, United States
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5
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Liisberg MB, Rück V, Vosch T. Time gated Fourier transform spectroscopy with burst excitation for time-resolved spectral maps from the nano- to millisecond range. Chem Commun (Camb) 2023; 59:12625-12628. [PMID: 37791644 DOI: 10.1039/d3cc03961g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
We demonstrate burst-mode Time Gated Fourier Transform Spectroscopy (bmTG-FTS), a technique for simultaneously capturing and disentangling emission signals from short- (ns) and long-lived (μs-ms) states. We showcase the possibilities of the technique by preparing time gated temporal-spectral maps from a dual-emissive DNA-stabilized silver nanocluster (DNA-AgNC).
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Affiliation(s)
- Mikkel B Liisberg
- Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
| | - Vanessa Rück
- Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
| | - Tom Vosch
- Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
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6
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Filer CN. Luminescence enhancement by deuterium. J Labelled Comp Radiopharm 2023; 66:372-383. [PMID: 37587721 DOI: 10.1002/jlcr.4056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 07/13/2023] [Indexed: 08/18/2023]
Abstract
Created literally at the dawn of time, deuterium has been extremely valuable in so many chemistry roles. The subject of this review focuses on one deuterium application in particular: its enhancement of luminescence in many substances. After providing general overviews of both deuterium and luminescence, the early exploration of deuterium's effect on luminescence is described, followed by a number of specific topics. These sections include a discussion of deuterium-influenced luminescence for dyes, proteins, singlet oxygen, and the lanthanide elements, as well as anomalous inverse deuterium luminescence effects. Future directions for this important research topic are also proposed, as well as a summary conclusion.
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7
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Rück V, Liisberg MB, Mollerup CB, He Y, Chen J, Cerretani C, Vosch T. A DNA-Stabilized Ag 18 12+ Cluster with Excitation-Intensity-Dependent Dual Emission. Angew Chem Int Ed Engl 2023; 62:e202309760. [PMID: 37578902 DOI: 10.1002/anie.202309760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 08/11/2023] [Accepted: 08/14/2023] [Indexed: 08/16/2023]
Abstract
DNA-stabilized silver nanoclusters (DNA-AgNCs) are easily tunable emitters with intriguing photophysical properties. Here, a DNA-AgNC with dual emission in the red and near-infrared (NIR) regions is presented. Mass spectrometry data showed that two DNA strands stabilize 18 silver atoms with a nanocluster charge of 12+. Besides determining the composition and charge of DNA2 [Ag18 ]12+ , steady-state and time-resolved methods were applied to characterize the picosecond red fluorescence and the relatively intense microsecond-lived NIR luminescence. During this process, the luminescence-to-fluorescence ratio was found to be excitation-intensity-dependent. This peculiar feature is very rare for molecular emitters and allows the use of DNA2 [Ag18 ]12+ as a nanoscale excitation intensity probe. For this purpose, calibration curves were constructed using three different approaches based either on steady-state or time-resolved emission measurements. The results showed that processes like thermally activated delayed fluorescence (TADF) or photon upconversion through triplet-triplet annihilation (TTA) could be excluded for DNA2 [Ag18 ]12+ . We, therefore, speculate that the ratiometric excitation intensity response could be the result of optically activated delayed fluorescence.
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Affiliation(s)
- Vanessa Rück
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark
| | - Mikkel B Liisberg
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark
| | - Christian Brinch Mollerup
- Department of Forensic Medicine, University of Copenhagen, Frederik V's Vej 11, 2100, Copenhagen, Denmark
| | - Yanmei He
- Division of Chemical Physics and NanoLund, Lund University P.O. Box 124, 22100, Lund, Sweden
| | - Junsheng Chen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark
| | - Cecilia Cerretani
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark
| | - Tom Vosch
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark
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8
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Wang X, Liisberg MB, Vonlehmden GL, Fu X, Cerretani C, Li L, Johnson LA, Vosch T, Richards CI. DNA-AgNC Loaded Liposomes for Measuring Cerebral Blood Flow Using Two-Photon Fluorescence Correlation Spectroscopy. ACS NANO 2023; 17:12862-12874. [PMID: 37341451 PMCID: PMC11065323 DOI: 10.1021/acsnano.3c04489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/22/2023]
Abstract
Unraveling the transport of drugs and nanocarriers in cerebrovascular networks is important for pharmacokinetic and hemodynamic studies but is challenging due to the complexity of sensing individual particles within the circulatory system of a live animal. Here, we demonstrate that a DNA-stabilized silver nanocluster (DNA-Ag16NC) that emits in the first near-infrared window upon two-photon excitation in the second NIR window can be used for multiphoton in vivo fluorescence correlation spectroscopy for the measurement of cerebral blood flow rates in live mice with high spatial and temporal resolution. To ensure bright and stable emission during in vivo experiments, we loaded DNA-Ag16NCs into liposomes, which served the dual purposes of concentrating the fluorescent label and protecting it from degradation. DNA-Ag16NC-loaded liposomes enabled the quantification of cerebral blood flow velocities within individual vessels of a living mouse.
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Affiliation(s)
- Xiaojin Wang
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Mikkel B. Liisberg
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Georgia L. Vonlehmden
- Department of Physiology, University of Kentucky, Lexington, Kentucky 40536, United States
| | - Xu Fu
- Light Microscopy Core, University of Kentucky, Lexington, Kentucky 40536, United States
| | - Cecilia Cerretani
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Lan Li
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Lance A. Johnson
- Department of Physiology, University of Kentucky, Lexington, Kentucky 40536, United States
- Sanders Brown Center on Aging, University of Kentucky, Lexington, Kentucky 40508, United States
| | - Tom Vosch
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
- Nanoscience Center, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
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9
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Lewis D, Setzler C, Goodwin PM, Thomas K, Branham M, Arrington CA, Petty JT. Interrupted DNA and Slow Silver Cluster Luminescence. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:10574-10584. [PMID: 37313118 PMCID: PMC10258842 DOI: 10.1021/acs.jpcc.3c01050] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 05/16/2023] [Indexed: 06/15/2023]
Abstract
A DNA-silver cluster conjugate is a hierarchical chromophore with a partly reduced silver core embedded within the DNA nucleobases that are covalently linked by the phosphodiester backbone. Specific sites within a polymeric DNA can be targeted to spectrally tune the silver cluster. Here, the repeated (C2A)6 strand is interrupted with a thymine, and the resulting (C2A)2-T-(C2A)4 forms only Ag106+, a chromophore with both prompt (∼1 ns) green and sustained (∼102 μs) red luminescence. Thymine is an inert placeholder that can be removed, and the two fragments (C2A)2 and (C2A)4 also produce the same Ag106+ adduct. In relation to (C2A)2T(C2A)4, the (C2A)2 + (C2A)4 pair is distinguished because the red Ag106+ luminescence is ∼6× lower, relaxes ∼30% faster, and is quenched ∼2× faster with O2. These differences suggest that a specific break in the phosphodiester backbone can regulate how a contiguous vs broken scaffold wraps and better protects its cluster adduct.
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Affiliation(s)
- David Lewis
- Department
of Chemistry, Furman University, Greenville, South Carolina 29163, United States
| | - Caleb Setzler
- Department
of Chemistry, Furman University, Greenville, South Carolina 29163, United States
| | - Peter M. Goodwin
- Center
for Integrated Nanotechnologies, Mail Stop K771, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Kirsten Thomas
- Department
of Chemistry, Furman University, Greenville, South Carolina 29163, United States
| | - Makayla Branham
- Department
of Chemistry, Furman University, Greenville, South Carolina 29163, United States
| | - Caleb A. Arrington
- Department
of Chemistry, Wofford College, Spartanburg, South Carolina 29303, United States
| | - Jeffrey T. Petty
- Department
of Chemistry, Furman University, Greenville, South Carolina 29163, United States
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10
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Chen J, Kumar A, Cerretani C, Vosch T, Zigmantas D, Thyrhaug E. Excited-State Dynamics in a DNA-Stabilized Ag 16 Cluster with Near-Infrared Emission. J Phys Chem Lett 2023; 14:4078-4083. [PMID: 37120843 PMCID: PMC10166082 DOI: 10.1021/acs.jpclett.3c00764] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Due to desirable optical properties, such as efficient luminescence and large Stokes shift, DNA-templated silver nanoclusters (DNA-AgNCs) have received significant attention over the past decade. Nevertheless, the excited-state dynamics of these systems are poorly understood, as studies of the processes ultimately leading to a fluorescent state are scarce. Here we investigate the early time relaxation dynamics of a 16-atom silver cluster (DNA-Ag16NC) featuring NIR emission in combination with an unusually large Stokes shift of over 5000 cm-1. We follow the photoinduced dynamics of DNA-Ag16NC on time ranges from tens of femtoseconds to nanoseconds using a combination of ultrafast optical spectroscopies, and extract a kinetic model to clarify the physical picture of the photoinduced dynamics. We expect the obtained model to contribute to guiding research efforts toward elucidating the electronic structure and dynamics of these novel objects and their potential applications in fluorescence-based labeling, imaging, and sensing.
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Affiliation(s)
- Junsheng Chen
- Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Ajeet Kumar
- Department of Chemistry, School of Natural Sciences, Technical University of Munich, D-85747 Garching, Germany
| | - Cecilia Cerretani
- Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Tom Vosch
- Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Donatas Zigmantas
- Division of Chemical Physics, Lund University, Naturvetarvägen 16, 22362 Lund, Sweden
| | - Erling Thyrhaug
- Department of Chemistry and Catalysis Research Center (CRC), School of Natural Sciences, Technical University of Munich, D-85747 Garching, Germany
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11
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Cai S, Chen X, Chen H, Zhang Y, Wang X, Zhou N. A fluorescent aptasensor for ATP based on functional DNAzyme/walker and terminal deoxynucleotidyl transferase-assisted formation of DNA-AgNCs. Analyst 2023; 148:799-805. [PMID: 36692002 DOI: 10.1039/d2an02006h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The development of sensitive adenosine triphosphate (ATP) sensors is imperative due to the tight relationship between the physiological conditions and ATP levels in vivo. Herein, a fluorescent aptasensor for ATP is presented, which adopts a strategy that combines a split aptamer and a DNAzyme/walker with terminal deoxynucleotidyl transferase (TDT)-assisted formation of DNA-AgNCs to realize fluorescence detection of ATP. A multifunctional oligonucleotide sequence is rationally designed, which integrates a split aptamer, a DNAzyme and a DNA walker. Both multifunctional oligonucleotide and its substrate strand are connected to the surface of Fe3O4@Au nanoparticles via Au-S bonds. The existence of ATP can induce the formation of the complete aptamer, and then activate the DNAzyme to circularly cleave the substrate strand, leaving 2',3'-cyclophosphate at the 3'end of the strand. This blocks the polymerization of dCTP to form poly(C) even in the presence of TDT and dCTP, due to the lack of free 3'-OH. In contrast, when ATP is absent, the DNAzyme/walker cannot work and then TDT catalyzes the formation of poly(C) at the free 3'-OH of the substrate strand, which is subsequently utilized as the template to prepare DNA-AgNCs. The fluorescence response derived from AgNCs thus reflects the ATP concentration. Under the optimum conditions, the aptasensor shows a linear response range from 5 nM to 10 000 nM, with a detection limit of 0.27 nM. The level of ATP in human serum can be effectively measured by the aptasensor with good recovery, indicating its application potential in medical samples.
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Affiliation(s)
- Shixin Cai
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
| | - Xin Chen
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
| | - Haohan Chen
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
| | - Yuting Zhang
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
| | - Xiaoli Wang
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
| | - Nandi Zhou
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
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12
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Deploying Radical Inter-Transition from •OH to Supported NO3• on Mono-Dentate NO3--Modified ZrO2 to Sustain Fragmentation of Aqueous Contaminants. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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13
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Gonzàlez-Rosell A, Guha R, Cerretani C, Rück V, Liisberg MB, Katz BB, Vosch T, Copp SM. DNA Stabilizes Eight-Electron Superatom Silver Nanoclusters with Broadband Downconversion and Microsecond-Lived Luminescence. J Phys Chem Lett 2022; 13:8305-8311. [PMID: 36037464 PMCID: PMC9465679 DOI: 10.1021/acs.jpclett.2c02207] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 08/26/2022] [Indexed: 05/25/2023]
Abstract
DNA oligomers are known to serve as stabilizing ligands for silver nanoclusters (AgN-DNAs) with rod-like nanocluster geometries and nanosecond-lived fluorescence. Here, we report two AgN-DNAs that possess distinctly different structural properties and are the first to exhibit only microsecond-lived luminescence. These emitters are characterized by significant broadband downconversion from the ultraviolet/visible to the near-infrared region. Circular dichroism spectroscopy shows that the structures of these two AgN-DNAs differ significantly from previously reported AgN-DNAs. We find that these nanoclusters contain eight valence electrons, making them the first reported DNA-stabilized luminescent quasi-spherical superatoms. This work demonstrates the important role that nanocluster composition and geometry play in dictating luminescence properties of AgN-DNAs and significantly expands the space of structure-property relations that can be achieved for AgN-DNAs.
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Affiliation(s)
- Anna Gonzàlez-Rosell
- Department
of Materials Science and Engineering, University
of California, Irvine, California 92697, United States
| | - Rweetuparna Guha
- Department
of Materials Science and Engineering, University
of California, Irvine, California 92697, United States
| | - Cecilia Cerretani
- Nanoscience
Center and Department of Chemistry, University
of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Vanessa Rück
- Nanoscience
Center and Department of Chemistry, University
of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Mikkel B. Liisberg
- Nanoscience
Center and Department of Chemistry, University
of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Benjamin B. Katz
- Department
of Chemistry, University of California, Irvine, California 92697, United States
| | - Tom Vosch
- Nanoscience
Center and Department of Chemistry, University
of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Stacy M. Copp
- Department
of Materials Science and Engineering, University
of California, Irvine, California 92697, United States
- Department
of Physics and Astronomy, University of
California, Irvine, California 92697, United States
- Department
of Chemical and Biomolecular Engineering, University of California, Irvine, California 92697, United States
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14
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Ramasanoff RR, Sokolov PA. Intersystem Crossing Rates of Violet-, Green- and Red-emitting DNA Stabilized Silver Luminescent Clusters. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.140081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Cerretani C, Liisberg MB, Rück V, Kondo J, Vosch T. The effect of inosine on the spectroscopic properties and crystal structure of a NIR-emitting DNA-stabilized silver nanocluster. NANOSCALE ADVANCES 2022; 4:3212-3217. [PMID: 36132821 PMCID: PMC9416947 DOI: 10.1039/d2na00325b] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 06/18/2022] [Indexed: 05/16/2023]
Abstract
The effect of replacing guanosines with inosines in the two stabilizing strands (5'-CACCTAGCGA-3') of the NIR emissive DNA-Ag16NC was investigated. The spectroscopic behavior of the inosine mutants is position-dependent: when the guanosine in position 7 was exchanged, the nanosecond fluorescence decay time shortened, while having the inosine in position 9 made the decay time longer. Thanks to structural information gained from single crystal X-ray diffraction measurements, it was possible to propose a mechanistic origin for the observed changes.
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Affiliation(s)
- Cecilia Cerretani
- Nanoscience Center and Department of Chemistry, University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Mikkel B Liisberg
- Nanoscience Center and Department of Chemistry, University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Vanessa Rück
- Nanoscience Center and Department of Chemistry, University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Jiro Kondo
- Department of Materials and Life Sciences, Sophia University 7-1 Kioi-cho Chiyoda-ku 102-8554 Tokyo Japan
| | - Tom Vosch
- Nanoscience Center and Department of Chemistry, University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
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Liisberg MB, Krause S, Cerretani C, Vosch T. Probing emission of a DNA-stabilized silver nanocluster from the sub-nanosecond to millisecond timescale in a single measurement. Chem Sci 2022; 13:5582-5587. [PMID: 35694333 PMCID: PMC9116328 DOI: 10.1039/d2sc01137a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 04/21/2022] [Indexed: 12/14/2022] Open
Abstract
A method for measuring emission over a range of sub-nanosecond to millisecond timescales is presented and demonstrated for a DNA-stabilized silver nanocluster (DNA-AgNC) displaying dual emission. This approach allows one to disentangle the temporal evolution of the two spectrally overlapping signals and to determine both the nano- and microsecond decay times of the two emission components, together with the time they take to reach the steady-state equilibrium. Addition of a second near-infrared laser, synchronized with a fixed delay, enables simultaneous characterization of optically activated delayed fluorescence (OADF). For this particular DNA-AgNC, we demonstrate that the microsecond decay times of the luminescent state and the OADF-responsible state are similar, indicating that the OADF process starts from the luminescent state. A method for measuring emission over a range of sub-nanosecond to millisecond timescales is presented and demonstrated for a DNA-stabilized silver nanocluster (DNA-AgNC) displaying dual emission.![]()
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Affiliation(s)
- Mikkel Baldtzer Liisberg
- Nanoscience Center, Department of Chemistry, University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Stefan Krause
- Nanoscience Center, Department of Chemistry, University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Cecilia Cerretani
- Nanoscience Center, Department of Chemistry, University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
| | - Tom Vosch
- Nanoscience Center, Department of Chemistry, University of Copenhagen Universitetsparken 5 2100 Copenhagen Denmark
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