Photobiochemistry in the Dark

Cilento, Giuseppe

doi:10.1007/978-1-4684-3641-9_5

Cited by 52 publications

(9 citation statements)

References 114 publications

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“…It is thus intriguing to speculate that an excited species might play a role in melatonin action. This is the spirit of Cilento's proposal that excited states formed in vivo may be able to modulate biologically important responses (33,34).…”

Section: Discussionmentioning

confidence: 95%

Myeloperoxidase-Catalyzed Oxidation of Melatonin by Activated Neutrophils

Silva

Ximenes

Catalani

et al. 2000

Biochemical and Biophysical Research Communications

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Section: Discussionmentioning

confidence: 95%

Myeloperoxidase-Catalyzed Oxidation of Melatonin by Activated Neutrophils

Silva

Ximenes

Catalani

et al. 2000

Biochemical and Biophysical Research Communications

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“…Photochemistry without light in which the excited species is generated enzymatically has been periodically reviewed (Cilento, 1980(Cilento, , 1982(Cilento, , 1984Adam and Cilento, 1983). Since the transformation undergone-or induced-by the enzyme-generated excited species is often of biological interest, the expression 'photobiochemistry without light' is frequently used.…”

Section: Products (Unimolecular Reaction)mentioning

confidence: 99%

PHOTOCHEMISTRY and PHOTOBIOLOGY WITHOUT LIGHT

Cilento

Adam

1988

Photochem & Photobiology

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Abstract-This review covers the literature since 1980 on chemically and enzymatically generated electronically excited species. The emphasis lies on triplet states of carbonyl products that are derived from dioxetanes and dioxetanones as precursors or from suitable enzymatic oxygenations. Singlet oxygen. an important excited state species in biological processes, is not explicitly treated. The utilization of triplet excited carbonyl products to promote photochemical and photobiological transformations by energy transfer are of primordial interest and not the photomechanistic behavior, photophysical properties and inherent photochemical reactions of such excited state species. Thus, the coverage concentrates on photodamage of DNA and RNA., the photochemistry of favins, vitamin D, tryptophan, arachidonic acid, chlorophyll, lipid peroxidation, urocanase activation, excitation of chlorophlasts, and the aerobic oxidation of Schiff bases derived from amino acids and proteins. The potential perspectives of employing authentic dioxetanes and enzymatically generated dioxetane intermediates as effective photon equivalents in photochemotherapy, phototoxicity, photoaffinity labeling and photogenotoxicity are pointed out, in the hope of stimulating more intensive activity in this emerging and novel bioorganic and photobiological field.

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“…The C L is considerably enhanced by the addition of xanthene dyes. It was proposed for many years that the enhance-621 ment was d u e t o energy transfer from enzyme-generated electronically excited species to xanthene dyes (21,22). Recent studies however have shown that the enhancement of the CL was the result of peroxidase-mediated co-oxidation of xanthene dyes and IAA rather than energy transfer (8,23).…”

Section: Introductionmentioning

confidence: 99%

OpticalIy Pumped Chemiluminescence of Indole‐3‐Acetic Acid

Krylov

Krylova

1996

Photochem & Photobiology

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Optically pumped chemiluminescence of indole‐3‐acetic acid (IAA) was observed and studied. Rose Bengal (RB) was used as a photosensitizer. Long‐lived chemiluminescence (CL) appeared after irradiation of the IAA/RB reaction mixture by monochromatic light at 550 nm (the maximum of RB absorption) or by visible light. The CL spectrum had a maximum at 480 nm. The kinetics of the CL decay were single exponential. Single‐exponential kinetics were characterized by two experimentally measured values: initial CL intensity and exponential lifetime of the CL decay. We studied the influence of five parameters: (1) the rate of irradiation fluence, (2) the time of irradiation, (3) RIB concentration, (4) IAA concentration and (5) buffer pH on the initial CL intensity and the CL lifetime. Initial CL intensity was proportional to the rate of irradiation fluence and the concentration of RB. Saturation was observed in dependencies of initial CL intensity on the time of irradiation, the concentration of IAA and the buffer pH. The lifetime of the CL decay decreased with increasing pH and did not depend on the other four parameters. The mechanism explaining the experimental results was suggested and detailed kinetic analysis was performed to prove the proposed mechanism. Quantum yield of the CL and five rate constants that are involved in the mechanism were determined.

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Photobiochemistry in the Dark

Cited by 52 publications

References 114 publications

Myeloperoxidase-Catalyzed Oxidation of Melatonin by Activated Neutrophils

Myeloperoxidase-Catalyzed Oxidation of Melatonin by Activated Neutrophils

PHOTOCHEMISTRY and PHOTOBIOLOGY WITHOUT LIGHT

OpticalIy Pumped Chemiluminescence of Indole‐3‐Acetic Acid

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