Dynamic process of the photo-chemically produced flavin radicals in a neutral micelle studied by a magnetic field effect

Horiuchi, M.; Maeda, Kiminori; Arai, Tatsuo

doi:10.1016/j.cplett.2004.06.143

Cited by 11 publications

(18 citation statements)

References 14 publications

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“…The same authors also studied radical pair formation between flavins and the aromatic part ( phenyl ether group) of the surfactant Triton X-100 (figure 7a; [45]). The Triton X-100 system produces non-ionic micelles and benefits from the huge advantage that the location of the electron donor, and hence the initial radical pair location within the micelle are known.…”

Section: Magnetic Field Effects In Micellesmentioning

confidence: 99%

“…Finally, recombination and ST interconversion compete at all times with spin state unselective Brownian motion of the geminately born radicals, which leads, eventually, to their physical separation. As a consequence, free radicals of much longer lifetime than their geminate counterparts are formed (figure 3; [44][45][46][47]). …”

Section: Photochemistry Of Flavinsmentioning

confidence: 99%

“…p*) (figure 4; [52,53]). For convenience, the third harmonic of the commonly available Nd:YAG laser (l ¼ 355 nm) is typically used to generate the excited singlet flavin which may subsequently form a radical pair with a suitable electron donor [44][45][46]48,49]. When working with cryptochrome and photolyase protein samples, it is important to minimize UV-induced photodegradation, hence care is taken to match the first absorption band more closely using a Nd:YAG pumped dye laser (l % 460 nm) for photoexcitation [54,55].…”

Section: Detection Of Flavin Magnetic Field Effectsmentioning

confidence: 99%

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Magnetic field effects in flavoproteins and related systems

et al. 2013

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Within the framework of the radical pair mechanism, magnetic fields may alter the rate and yields of chemical reactions involving spin-correlated radical pairs as intermediates. Such effects have been studied in detail in a variety of chemical systems both experimentally and theoretically. In recent years, there has been growing interest in whether such magnetic field effects (MFEs) also occur in biological systems, a question driven most notably by the increasing body of evidence for the involvement of such effects in the magnetic compass sense of animals. The blue-light photoreceptor cryptochrome is placed at the centre of this debate and photoexcitation of its bound flavin cofactor has indeed been shown to result in the formation of radical pairs. Here, we review studies of MFEs on free flavins in model systems as well as in blue-light photoreceptor proteins and discuss the properties that are crucial in determining the magnetosensitivity of these systems.

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Section: Magnetic Field Effects In Micellesmentioning

confidence: 99%

Section: Photochemistry Of Flavinsmentioning

confidence: 99%

Section: Detection Of Flavin Magnetic Field Effectsmentioning

confidence: 99%

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Magnetic field effects in flavoproteins and related systems

et al. 2013

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“…This indicates CS from 3 F* to give the RP 3 [TX +• F −• ] as has been reported previously. 8 In the previous study, F −• observed at the late times has been assigned to the free radical escaped to the bulk water due to the diffusion from the hydrophobic region to the outer layer as evidenced by the pH-dependent slow (∼microseconds) protonation kinetics at acidic conditions. Spectra with odV 2+ within ∼600 ns are similar to those observed without odV 2+ .…”

Section: T Is Important To Create Electron Donor (D)−acceptor (A)mentioning

confidence: 96%

“…As reference D−C systems, solutions of RFTB/RF in TX micelle without odV 2+ were also prepared (TX−RFTB/RF). 8 The average number of flavin molecules per one micelle is less than unity. The previous study 12 indicates that the concentration of the micelles without odV 2+ adsorption is small at [odV 2+ ] = 1.8 mM.…”

Section: T Is Important To Create Electron Donor (D)−acceptor (A)mentioning

confidence: 99%

Long-Distance Sequential Charge Separation at Micellar Interface Mediated by Dynamic Charge Transporter: A Magnetic Field Effect Study

Miura

Maeda

Murai

et al. 2015

J. Phys. Chem. Lett.

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Construction of photogenerated long-lived charge-separated states is crucial for light-energy conversion using organic molecules. For realization of cheap and easy-to-make long-distance electron transfer (ET) systems, we have developed a supramolecular donor(D)-chromophore(C)-acceptor(A) triad utilizing a micellar interface. Alkyl viologen (A(2+)) is adsorbed on the hydrophilic interface of Triton X-100 micelle, which bears D units in the hydrophobic core. Excited triplet state of a hydrophobic flavin C entrapped in the supercage gives rise to primary ET from D, which is followed by the secondary ET from C(-•) to A(2+) to give the long-lived (>10 μs) charge-separated state with negligible yield of escaped C(-•). Analysis of magnetic field effect reveals that diffusion of C(-•) from the core to the hydrophilic interface leads to long-distance ET with a low charge recombination yield of ∼20%. This novel concept of "dynamic charge transporter" has important implications for development of photon-energy conversion systems in solution phase.

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Photoinduced Rapid Transformation from Au Nanoagglomerates to Drug‐Conjugated Au Nanovesicles

2017

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Gold (Au) agglomerates (AGs) are reassembled using Triton X‐100 (T) and doxorubicin (D) dissolved in ethanol under 185 nm photoirradiation to form TAuD nanovesicles (NVs) under ambient gas flow conditions. The positively charged Au particles are then electrostatically conjugated with the anionic chains of TD components via a flowing drop (FD) reaction. Photoirradiation of the droplets in a tubular reactor continues the photophysicochemical reactions, resulting in the reassembly of Au AGs and TD into TAuD NVs. The fabricated NVs are electrostatically collected onto a polished aluminum rod in a single‐pass configuration. The dispersion of NVs is employed for bioassays to confirm uptake by cells and accumulation in tumors. The chemo‐photothermal activity is determined both in vitro and in vivo. Different combinations of components are also used to fabricate NVs using the FD reaction, and these NVs are suitable for gene delivery as well. This newly designed gaseous single‐pass process results in the reassembly of Au AGs for incorporation with TD without the need of batch wet chemical reactions, modifications, separations, or purifications. Thus, this process offers an efficient platform for preparing biofunctional Au nanostructures that requires neither complex physicochemical steps nor special storage techniques.

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Dynamic process of the photo-chemically produced flavin radicals in a neutral micelle studied by a magnetic field effect

Cited by 11 publications

References 14 publications

Magnetic field effects in flavoproteins and related systems

Magnetic field effects in flavoproteins and related systems

Long-Distance Sequential Charge Separation at Micellar Interface Mediated by Dynamic Charge Transporter: A Magnetic Field Effect Study

Photoinduced Rapid Transformation from Au Nanoagglomerates to Drug‐Conjugated Au Nanovesicles

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