1
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Trajectory of the spectral/structural rearrangements for photo-oxidative reaction of neat ketoprofen and its cyclodextrin complex. J INCL PHENOM MACRO 2022. [DOI: 10.1007/s10847-022-01160-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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2
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Kohlmann T, Goez M. The radicals of quercetin-derived antioxidants in Triton X-100 micelles. Phys Chem Chem Phys 2022; 24:5868-5878. [DOI: 10.1039/d1cp04690j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have employed photoionization with a pulsed laser (5 ns, 355 nm) as a direct access to the radicals of quercetin, five of its monoethers and three of its diethers...
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Siano G, Crespi S, Bonesi SM. Direct Irradiation of Phenol and Para-Substituted Phenols with a Laser Pulse (266 nm) in Homogeneous and Micro-heterogeneous Media. A Time-Resolved Spectroscopy Study. J Org Chem 2020; 85:14012-14025. [PMID: 33063512 DOI: 10.1021/acs.joc.0c02031] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Direct irradiation of para-substituted phenols under N2 atmosphere in homogeneous (cyclohexane, acetonitrile, and methanol) and micellar (SDS) solution was investigated by means of time-resolved spectroscopy. After a laser pulse (266 nm), two transient species were formed, viz. the para-substituted phenol radical-cations and the corresponding phenoxy radicals. The radical-cations showed a broad absorption band located between 390 and 460 nm, while the phenoxy radicals showed two characteristic bands centered at 320 nm and 400-410 nm. The deprotonation rate constant of radical-cations (kH) of 105 s-1 and the reaction rate constant of the phenoxy radicals (kR) in the order of 109-1010 M-1·s-1 have been derived. The kH rate constants gave good linear Hammett correlation with positive slope indicating that electron-withdrawing substituents enhance the radical-cation acidity. The binding constants (Kb) of the para-substituted phenols with the surfactant were also measured, and NOESY experiments showed that phenols were located in the hydrophobic core of the micelle. Finally, computational calculations provided the predicted absorption spectra of the transients and nice linear correlations were obtained between the theoretical and experimental energy of the lower absorption band of these species.
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Affiliation(s)
- Gastón Siano
- Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Quı́mica Orgánica, C1428EGA Buenos Aires, Argentina.,CONICET - Universidad de Buenos Aires. Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR). C1428EGA Buenos Aires, Argentina
| | - Stefano Crespi
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Sergio M Bonesi
- Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Quı́mica Orgánica, C1428EGA Buenos Aires, Argentina.,CONICET - Universidad de Buenos Aires. Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR). C1428EGA Buenos Aires, Argentina.,Dipartimento di Chimica, Sezione Chimica Organica, University of Pavia, v.le Taramelli 12, 27100 Pavia, Italy
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4
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Numviyimana C, Chmiel T, Kot-Wasik A, Namieśnik J. Study of pH and temperature effect on lipophilicity of catechol-containing antioxidants by reversed phase liquid chromatography. Microchem J 2019. [DOI: 10.1016/j.microc.2018.10.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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5
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Tang Y, Tang D, Zhang J, Tang D. Novel quartz crystal microbalance immunodetection of aflatoxin B 1 coupling cargo-encapsulated liposome with indicator-triggered displacement assay. Anal Chim Acta 2018; 1031:161-168. [PMID: 30119735 DOI: 10.1016/j.aca.2018.05.027] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 05/02/2018] [Accepted: 05/07/2018] [Indexed: 01/11/2023]
Abstract
A simple and sensitive quartz crystal microbalance (QCM) immunosensing platform was designed for the high-efficient detection of aflatoxin B1 (AFB1) in foodstuff. Initially, phenoxy-derived dextran molecule was immobilized on the surface of QCM gold substrate by using thiolated β-cyclodextrin based on the supramolecular host-guest chemistry between phenoxy group and cyclodextrin. Then, AFB1-bovine serum albumin (AFB1-BSA)-conjugated concanavalin A (Con A) was assembled onto the QCM probe through the dextran-Con A interaction. Glucose-loaded nanoliposome, labeled with monocolonal anti-AFB1 antibody, was used for the amplification of QCM signal. Upon target AFB1 introduction, the analyte competed with the immobilized AFB1-BSA on the probe for the labeled anti-AFB1 antibody on the nanoliposome. Based on specific antigen-antibody reaction, the amount of the conjugated nanoliposomes on the QCM probe gradually decreased with the increment of target AFB1 in the sample. Upon injection of Triton X-100 in the detection cell, the carried nanoliposome was lysed to release the encapsulated glucose molecules. Thanks to the stronger affinity of Con A toward glucose than that of dextran, AFB1-BSA-labeled Con A was displaced from the QCM probe, resulting in the change of the local frequency. Under the optimum conditions, the shift of the functionalized QCM immunosensing interface in the frequency shift was proportional to the concentration of target AFB1 within a dynamic range from 1.0 ng kg-1 to 10 μg kg-1 at a low detection limit of 0.83 ng kg-1. In addition, the acceptable assayed results on precision, reproducibility, specificity and method accuracy for the analysis of real samples were also acquired. Importantly, our strategy can provide a signal-on competitive immunoassay for the detection of small molecules, e.g., mycotoxins and biotoxins, thereby representing a versatile sensing schemes by controlling the corresponding antibody or hapten in the analysis of food safety.
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Affiliation(s)
- Ying Tang
- Collaborative Innovation Center of Targeted Therapeutics and Innovation, Chongqing Key Laboratory of Kinase Modulators As Innovative Medicine, Chongqing Engineering Laboratory of Targeted and Innovative Therapeutics, International Academy of Targeted Therapeutics and Innovation, Chongqing University of Arts and Sciences, Chongqing, 402160, PR China
| | - Dianyong Tang
- Collaborative Innovation Center of Targeted Therapeutics and Innovation, Chongqing Key Laboratory of Kinase Modulators As Innovative Medicine, Chongqing Engineering Laboratory of Targeted and Innovative Therapeutics, International Academy of Targeted Therapeutics and Innovation, Chongqing University of Arts and Sciences, Chongqing, 402160, PR China.
| | - Jin Zhang
- Collaborative Innovation Center of Targeted Therapeutics and Innovation, Chongqing Key Laboratory of Kinase Modulators As Innovative Medicine, Chongqing Engineering Laboratory of Targeted and Innovative Therapeutics, International Academy of Targeted Therapeutics and Innovation, Chongqing University of Arts and Sciences, Chongqing, 402160, PR China
| | - Dianping Tang
- Collaborative Innovation Center of Targeted Therapeutics and Innovation, Chongqing Key Laboratory of Kinase Modulators As Innovative Medicine, Chongqing Engineering Laboratory of Targeted and Innovative Therapeutics, International Academy of Targeted Therapeutics and Innovation, Chongqing University of Arts and Sciences, Chongqing, 402160, PR China; Key Laboratory of Analytical Science of Food Safety and Biology (MOE & Fujian Province), Department of Chemistry, Fuzhou University, Fuzhou, 350116, PR China.
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6
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Kerzig C, Hoffmann M, Goez M. Resveratrol Radical Repair by Vitamin C at the Micelle-Water Interface: Unexpected Reaction Rates Explained by Ion-Dipole Interactions. Chemistry 2018; 24:3038-3044. [PMID: 29314459 DOI: 10.1002/chem.201705635] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Indexed: 02/04/2023]
Abstract
Repair reactions of lipophilic phenoxy radicals by hydrophilic co-antioxidants at model membranes are important for understanding the factors that govern the interactions between radical scavengers in biological systems. By using near-UV photoionization, we have selectively generated the phenoxy radical of the famous antioxidant resveratrol inside anionic (SDS), cationic (DTAC), or neutral (TX-100) micelles, as well as in homogeneous aqueous solution, and have compared its repairs in these media by the water-soluble co-antioxidants ascorbic acid and ascorbate monoanion. With all surfactants, these reactions are dynamic processes at the micelle-water interface. Whereas for the combinations ascorbate monoanion/ ionic micelle the repair rates can be rationalized by the Coulombic interactions, unexpected effects were observed with the neutral ascorbic acid and the charged micelles: for the anionic micelles, this repair is three times faster than in homogeneous solution, and two orders of magnitude faster than for the cationic micelles. Given that the repair by a concerted proton-electron transfer demands a coplanar arrangement of the resveratrol phenoxy centre sticking out into the Stern layer and the co-antioxidant hydroxy moiety approaching from the aqueous bulk, we explain these results by ion-dipole interactions: only at a negatively charged micellar surface does the direction of the large dipole moment of ascorbic acid lead to an orientation favourable for the repair.
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Affiliation(s)
- Christoph Kerzig
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Kurt-Mothes-Str. 2, 06120, Halle (Saale), Germany.,Present address: Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Matthias Hoffmann
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Kurt-Mothes-Str. 2, 06120, Halle (Saale), Germany
| | - Martin Goez
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Kurt-Mothes-Str. 2, 06120, Halle (Saale), Germany
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Takeshita T, Yano A, Hara M. Light-Driven Proton Release of Spirobenzopyran-Derived Protonated Photomerocyanine in Cyclodextrin Aqueous Solution. ChemistrySelect 2017. [DOI: 10.1002/slct.201702119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tatsuya Takeshita
- Department of Environmental and Food Sciences; Fukui University of Technology 3-6-1 Gakuen; Fukui 910-8505 Japan
| | - Atsushi Yano
- Department of Environmental and Food Sciences; Fukui University of Technology 3-6-1 Gakuen; Fukui 910-8505 Japan
| | - Michihiro Hara
- Department of Environmental and Food Sciences; Fukui University of Technology 3-6-1 Gakuen; Fukui 910-8505 Japan
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Li X, Shi J, Wu K, Luo F, Zhang S, Guan X, Lu M. A novel pH-sensitive aqueous supramolecular structured photoinitiator comprising of 6-modified per-methylated β -cyclodextrin and 1-hydroxycyclohexyl phenyl ketone. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.10.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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Kohlmann T, Naumann R, Kerzig C, Goez M. Combined static and dynamic quenching in micellar systems—closed-form integrated rate laws verified using a versatile probe. Phys Chem Chem Phys 2017; 19:8735-8741. [DOI: 10.1039/c6cp08491e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
One probe to rule them all: an extremely long-lived radical cation M˙+ generated by green-light photoionization allowed new theories of combined static and dynamic intra- and intermicellar quenching to be tested.
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Affiliation(s)
- Tim Kohlmann
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- Kurt-Mothes-Str. 2
- D-06120 Halle (Saale)
- Germany
| | - Robert Naumann
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- Kurt-Mothes-Str. 2
- D-06120 Halle (Saale)
- Germany
| | - Christoph Kerzig
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- Kurt-Mothes-Str. 2
- D-06120 Halle (Saale)
- Germany
| | - Martin Goez
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- Kurt-Mothes-Str. 2
- D-06120 Halle (Saale)
- Germany
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10
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Kohlmann T, Naumann R, Kerzig C, Goez M. Green-light ionization of 3-aminoperylene in SDS micelles—a promising access to hydrated electrons despite a myth debunked. Photochem Photobiol Sci 2017; 16:185-192. [DOI: 10.1039/c6pp00403b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Contrary to earlier surmises in the literature, it takes more than a single green photon to ionize 3-aminoperylene in SDS micelles, but a number of favourable properties still make this system very attractive for generating a “super reductant” under mild conditions.
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Affiliation(s)
- Tim Kohlmann
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- D-06120 Halle
- Germany
| | - Robert Naumann
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- D-06120 Halle
- Germany
| | - Christoph Kerzig
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- D-06120 Halle
- Germany
| | - Martin Goez
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- D-06120 Halle
- Germany
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11
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Kohlmann T, Naumann R, Kerzig C, Goez M. 3-Aminoperylene and ascorbate in aqueous SDS, one green laser flash … and action! Sustainably detoxifying a recalcitrant chloro-organic. Photochem Photobiol Sci 2017; 16:1613-1622. [DOI: 10.1039/c7pp00311k] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Green light releases the predator eaq˙− (the hydrated electron) at near-physiological pH through a metal-free catalytic cycle, consuming only ascorbate AscH− as a sacrificial donor, and decomposing organochlorides R–Cl with high turnover numbers.
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Affiliation(s)
- Tim Kohlmann
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- D-06120 Halle (Saale)
- Germany
| | - Robert Naumann
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- D-06120 Halle (Saale)
- Germany
| | - Christoph Kerzig
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- D-06120 Halle (Saale)
- Germany
| | - Martin Goez
- Martin-Luther-Universität Halle-Wittenberg
- Institut für Chemie
- D-06120 Halle (Saale)
- Germany
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