Photochemical & Photobiological Sciences
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Highly sensitive eight-channel light sensing system for biomedical applications
Photochemical & Photobiological Sciences - Tập 19 - Trang 524-529 - 2020
We demonstrate the potential of an eight-channel light sensing platform system, named Black Box I (BBI), for rapid and highly sensitive measurement of low-level light using a nonradioactive optical readout. We developed, normalized, and characterized the photon sensitivities of the eight channels of the BBI using placental alkaline phosphatase (PLAP) as a model imaging reporter. We found that the ......
Stereoselective interaction of ketoprofen enantiomers with β-cyclodextrin: ground state binding and photochemistry
Photochemical & Photobiological Sciences - Tập 10 - Trang 48-59 - 2020
The chiral recognition ability of β-cyclodextrin (β-CyD) vs. S- and R-ketoprofen (KP) enantiomers has been studied by circular dichroism (CD), isothermal titration calorimetry (ITC) and NMR. The association constants of the 1 ∶ 1 complexes obtained from CD and ITC titration experiments resulted to be the same for both enantiomers within the experimental uncertainty. Well differentiated CD spectra ......
Synthesis and photophysical properties of pyridyl conjugated triazole appended naphthalenediimide derivatives
Photochemical & Photobiological Sciences - Tập 18 - Trang 1333-1341 - 2020
A series of three substituted triazole appended NDI-derivatives, 2,7-bis(3,5-di(pyridin-X-yl)-4H-1,2,4-triazol-4-yl)benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetraone (where X = 2, NDI-PyTz-1; 3, NDI-PyTz-2; and 4, NDI-PyTz-3), were designed, synthesized and well characterized using various analytical and spectroscopic techniques. All the three NDI-PyTz derivatives exhibit decent electronic pro......
Investigation of the photoisomerisation process in four p-benzoxazoyl-substituted stilbenes
Photochemical & Photobiological Sciences - Tập 9 - Trang 357-364 - 2010
Fluorescence properties and trans-cisphotoisomerisation of the benzoxazole derivatives 2-[4-(E)-(styryl)phenyl]benzoxazole (I), 2-{4-[(E)-2-(4-methoxyphenyl)vinyl]phenyl}benzoxazole (II), {4-[(E)-2-(4-benzoxazol-2-yl-phenyl)vinyl]phenyl}dimethylamine (III) and {4-[(E)-2-(4-benzoxazol-2-yl-phenyl)vinyl]phenyl}diphenylamine (IV) have been investigated in solvents of different polarities. It was foun......
ER stress, autophagy and immunogenic cell death in photodynamic therapy-induced anti-cancer immune responses
Photochemical & Photobiological Sciences - Tập 13 - Trang 474-487 - 2014
Tumours are a form of pseudo-organs with their own microenvironment where the cancer cells nurture a dysfunctional immune environment incapable of inciting anti-tumour immunity. It had been proposed that the only way to counteract such an immune system dysfunction in tumours is by eliciting, therapeutically, a cancer cell death pathway that is accompanied by high immunogenicity and possibly inhibi......
Quenching of the fluorescence of pterin derivatives by anions
Photochemical & Photobiological Sciences - Tập 3 - Trang 167-173 - 2004
Steady-state and time-resolved studies of the fluorescence of pterins in aqueous solutions in the presence of different anions have been performed using the single-photon counting technique. In the pH range between 3 and 13, most pterins exist in a protonated and a deprotonated form. Results obtained for both acid and basic forms of five compounds belonging to the pterin family (pterin, 6-carboxyp......
Temperature dependence of the flash duration of the firefly Luciola praeusta
Photochemical & Photobiological Sciences - Tập 13 - Trang 1788-1792 - 2014
Firefly flashing has attracted the attention of both poets and scientists for over a century. Here we study the effect of temperature on the flash duration of the Indian species of the firefly Luciola praeusta Kiesenwetter 1874 (Coleoptera: Lampyridae: Luciolinae). Recording in vivo time-resolved spectra of specimens of this species of firefly over the temperature range 20 °C-40 °C, it is observed......
Novel luminescent hybrids by incorporating rare earth β-diketonates into polymers through ion pairing with an imidazolium counter ion
Photochemical & Photobiological Sciences - - 2013
A series of luminescent polymers are synthesized by incorporating rare earth complex units into polymer matrices. Firstly, we functionalize the selected polymer matrices with the imidazolium moieties, and then introduce the rare earth tetrakis(β-diketonate) complexes into polymer matrices through a mild anion exchange method. The resulting materials are characterized by FTIR, XRD, EDAX, SEM, therm......
Poly(butyl cyanoacrylate) nanoparticle containing an organic photoCORM
Photochemical & Photobiological Sciences - Tập 18 - Trang 2666-2672 - 2020
Carbon monoxide (CO) is a gasotransmitter, which has shown therapeutic effects in recent studies. Photo carbon monoxide releasing molecules (PhotoCORMs) allow the delivery of CO to be controlled by light. In this work, a new organic photoCORM DK4 is studied. DK4 is a diketone type photoCORM, which releases two CO molecules under visible light and simultaneously generates a fluorescent anthracene d......
Mesogenic BODIPYs: an investigation of the correlation between liquid crystalline behaviour and fluorescence intensity
Photochemical & Photobiological Sciences - Tập 10 - Trang 992-999 - 2020
A series of mesogenic molecules based on the 4,4′-difluoro-3a,4a-diaza-s-indacene (BODIPY) fluorophore have been synthesised and characterised. Each compound consists of one mesogenic unit, based on a cyanobiphenyl core, and one fluorophore, of varying alkyl substitution. The compounds were prepared by microwave-assisted palladium-catalyzed couplings (Suzuki and Sonogashira) due to slow reaction r......
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