Two new sterically hindered phthalocyanines: synthetic and photodynamic aspects.


:The synthesis and the properties of 1,4-dibutoxy-2,3-dicyanotriptycene, of a metal-free tetradibenzobarrelenooctabutoxyphthalocyanine, and of the corresponding zinc phthalocyanine are described. The two phthalocyanines do not aggregate when dissolved in benzene at concentrations up to 450 microM. For the metal-free and the zinc compounds, the red band maxima are at 736 and 757 nm, the triplet maxima are at 590 and 605 nm, the triplet state lifetimes are 58 and 177 microseconds, and the protoporphyrin-IX dimethyl ester-to-compound bimolecular rate constants for triplet energy transfer are 2.61 x 10(8) and 1.47 x 10(8) M-1 s-1. Triplet energy transfer from the metal-free compound to O2 is endoergonic by 1.0 kcal mol-1. The potential of the zinc compound for photodynamic therapy is touched upon.


Photochem Photobiol


Rihter BD,Bohorquez MD,Rodgers MA,Kenney ME




Has Abstract


1992-05-01 00:00:00












  • Molecular beacon probes of photodamage in thymine and uracil oligonucleotides.

    abstract::Molecular beacons (MB) are becoming more common as sequence-selective detectors of nucleic acids. Although they can easily detect single-base mismatches, they have never been used to directly detect DNA or RNA damage. To measure the degree of ultraviolet (UV) light damage in oligonucleotides, we report a novel MB appr...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Yarasi S,McConachie C,Loppnow GR

    更新日期:2005-03-01 00:00:00

  • Theoretical study of the reaction formalhydrazone with singlet oxygen. Fragmentation of the C=N bond, ene reaction and other processes.

    abstract::Photobiologic and synthetic versatility of hydrazones has not yet been established with (1)O2 as a route to commonly encountered nitrosamines. Thus, to determine whether the "parent" reaction of formalhydrazone and (1)O2 leads to facile C=N bond cleavage and resulting nitrosamine formation, we have carried out CCSD(T)...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Rudshteyn B,Castillo A,Ghogare AA,Liebman JF,Greer A

    更新日期:2014-03-01 00:00:00

  • Photophysical properties of tin ethyl etiopurpurin I (SnET2) and tin octaethylbenzochlorin (SnOEBC) in solution and bound to albumin.

    abstract::The photophysical characteristics of two second-generation PDT photosensitizers, tin ethyl etiopurpurin I (SnET2) and tin octaethylbenzochlorin (SnOEBC), have been measured in homogeneous solution and when bound to bovine serum albumin (BSA). The ground state and triplet state absorption spectra have been characterize...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Pogue BW,Redmond RW,Trivedi N,Hasan T

    更新日期:1998-12-01 00:00:00

  • Circadian gating of photoinduction of commitment to cell-cycle transitions in relation to photoperiodic control of cell reproduction in Euglena.

    abstract::A novel type of circadian and photoperiodic control of the cell division cycle was found in photoautotrophic Euglena gracilis. When algae entrained to 24 h light-dark (LD) cycles (14 h L) were transferred to continuous darkness (DD) at the eighth hour of the final LD photoperiod, cell-cycle transition was arrested in ...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Hagiwara SY,Bolige A,Zhang Y,Takahashi M,Yamagishi A,Goto K

    更新日期:2002-07-01 00:00:00

  • Photophysical properties of metal ion functionalized NaY zeolite.

    abstract::A series of luminescent ion exchanged zeolite are synthesized by introducing various ions into NaY zeolite. Monometal ion (Eu(3+), Tb(3+), Ce(3+), Y(3+), Zn(2+), Cd(2+), Cu(2+)) exchanged zeolite, rare-earth ion (Eu(3+), Tb(3+), Ce(3+)) exchanged zeolite modified with Y(3+) and rare-earth ion (Eu(3+), Tb(3+), Ce(3+)) ...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Duan TW,Yan B

    更新日期:2014-05-01 00:00:00

  • Effect of light on expression of clock genes in Xenopus laevis melanophores.

    abstract::Light-dark cycles are considered important cues to entrain biological clocks. A feedback loop of clock gene transcription and translation is the molecular basis underlying the mechanism of both central and peripheral clocks. Xenopus laevis embryonic melanophores respond to light with melanin granule dispersion, respon...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Magalhães Moraes MN,de Oliveira Poletini M,Ribeiro Ramos BC,de Lima LH,de Lauro Castrucci AM

    更新日期:2014-05-01 00:00:00

  • Dye-sensitized destabilization of liposomes bearing photooxidizable lipid head groups.

    abstract::Liposomes were prepared from mixtures of dipalmitoyl-L-alpha-phosphatidylcholine and up to 40% mol:mol of N-stearoyl-L-histidine (NSH) in the presence of the hydrophobic sensitizer DHE. In the dark such liposomes are stable and retain entrapped salts. On photolysis with visible light, liposomes leak trapped ions at NS...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Chowdhary RK,Green CA,Morgan CG

    更新日期:1993-09-01 00:00:00

  • Synergistic effect of ultrasound and thiazone-PEG 400 on human skin optical clearing in vivo.

    abstract::In this paper, we propose a new physical method in combination with mixed solution of thiazone and polyethylene glycol 400 (thiazone PEG 400 solution) penetration into tissue to assess the skin optical clearing. Four treatments were performed: (1) control group (C); (2) polyethylene glycol 400 (PEG400); (3) 0.25% thia...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Zhong H,Guo Z,Wei H,Guo L,Wang C,He Y,Xiong H,Liu S

    更新日期:2010-05-01 00:00:00

  • Ultraviolet germicidal irradiation: future directions for air disinfection and building applications.

    abstract::Ultraviolet germicidal irradiation (UVGI) for air disinfection applications has relied on low-pressure mercury vapor lamps for decades. New design requirements have generated the need for alternatives in some uses. This study describes the current state of UVGI technology and describes future directions for technology...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章,评审


    authors: Miller SL,Linnes J,Luongo J

    更新日期:2013-07-01 00:00:00

  • Lifetime of fluorescent pyrene butyric acid probe in single living cells for measurement of oxygen fluctuation.

    abstract::We study the fluorescence lifetime of the well-known 1-pyrene butyric acid (PBA) to assess oxygen concentrations in living cells. The behavior of the probe is first studied in water, ethanol, protein solution and liposome suspension. The Stern-Volmer plot of these solutions is linear, and the bimolecular reaction rate...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Ribou AC,Vigo J,Salmon JM

    更新日期:2004-09-01 00:00:00

  • Enhancement of ALA-PDT damage by IR-induced hyperthermia on a colon carcinoma model.

    abstract::The interaction of photodynamic therapy (PDT) with 5-aminolevulinic acid (ALA) and hyperthermia is not well understood. In the present study, significant enhancement of tumor damage was observed after simultaneous application of ALA-PDT and IR-induced hyperthermia using a broad-band incoherent light source. One hour a...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Orenstein A,Kostenich G,Kopolovic Y,Babushkina T,Malik Z

    更新日期:1999-06-01 00:00:00

  • Lethal Effect of Photodynamic Treatment on Persister Bacteria.

    abstract::Persister bacteria tolerate bactericidal antibiotics due to transient and reversible phenotypic changes. As these bacteria can limit the effectiveness of antibiotics to eradicate certain infections, their elimination is a relevant issue. Photodynamic therapy seems suitable for this purpose, but phenotypic tolerance to...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Oppezzo OJ,Forte Giacobone AF

    更新日期:2018-01-01 00:00:00

  • The use of wavelength-selective plastic cladding materials in horticulture: understanding of crop and fungal responses through the assessment of biological spectral weighting functions.

    abstract::Plant responses to light spectral quality can be exploited to deliver a range of agronomically desirable end points in protected crops. This can be achieved using plastics with specific spectral properties as crop covers. We have studied the responses of a range of crops to plastics that have either (a) increased tran...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Paul ND,Jacobson RJ,Taylor A,Wargent JJ,Moore JP

    更新日期:2005-09-01 00:00:00

  • Effect of psoralen + ultraviolet-A on the chemotactic activity of polymorphonuclear neutrophils towards anaphylatoxin C5a des Arg.

    abstract::It was shown that psoralen + UV-A inhibits the chemotactic activity of polymorphonuclear neutrophils towards anaphylatoxin C5a des Arg. This reaction required oxygen and there is a high possibility that the active oxygen species was in a singlet state. Oxygen did not act directly on C5a des Arg, but rather produced ox...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Esaki K,Mizuno N

    更新日期:1992-05-01 00:00:00

  • Diastereoselectivity and site dependency in the photochemistry of ketoprofen in the bovine serum albumin matrix.

    abstract::The photodegradation of the S(+)- and R(-)-ketoprofen (KP) enantiomers in the bovine serum albumin matrix was studied by steady-state photolysis with the use of lambda(irr) > 320 nm and transient absorption spectroscopy with lambda(exc) = 355 nm, at 1/1 and 2/1 KP/BSA molar ratios. R(-)-KP was found to be more labile ...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Monti S,Manet I,Manoli F,Morrone R,Nicolosi G,Sortino S

    更新日期:2006-01-01 00:00:00

  • Preclinical evaluation of a novel water-soluble chlorin E6 derivative (BLC 1010) as photosensitizer for the closure of the neovessels.

    abstract::In the present study, photodynamic activity of a novel photosensitizer (PS), Chlorin e(6)-2.5 N-methyl-d-glucamine (BLC 1010), was evaluated using the chorioallantoic membrane (CAM) as an in vivo model. After intravenous (i.v.) injection of BLC 1010 into the CAM vasculature, the applicability of this drug for photodyn...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Pegaz B,Debefve E,Borle F,Ballini JP,Wagnières G,Spaniol S,Albrecht V,Scheglmann D,Nifantiev NE,van den Bergh H,Konan YN

    更新日期:2005-11-01 00:00:00

  • Photostability of Terbinafine Under UVA Irradiation: The Effect of UV Absorbers.

    abstract::The photostability of drugs administered topically on unprotected skin is a complex phenomenon that could be connected with the loss of activity or, rather rarely, the occurrence of toxic degradation products. In this study, an in-depth investigation of the photostability of terbinafine, in both solutions and formulat...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Kryczyk-Poprawa A,Żmudzki P,Koczurkiewicz P,Pękala E,Hubicka U

    更新日期:2019-07-01 00:00:00

  • Photodynamic activity of substituted zinc trisulfophthalocyanines: role of plasma membrane damage.

    abstract::We recently reported that variations in cellular phototoxicity among a series of alkynyl-substituted zinc trisulfophthalocyanines (ZnPcS3Cn) correlates with their hydrophobicity, with the most amphiphilic derivatives showing the highest cell uptake and phototoxicity. In this study we address the role of the plasma mem...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Cauchon N,Nader M,Bkaily G,van Lier JE,Hunting D

    更新日期:2006-11-01 00:00:00

  • Light-induced starch degradation in non-dormant turions of Spirodela polyrhiza.

    abstract::Continuous red light controls starch degradation in turions of Spirodela polyrhiza [Dölger, K., U. K. Tirlapur and K.-J. Appenroth [1997] Photochem. Photobiol. 66, 126-127 (1997)]. This light could be replaced by repeated red light pulses with the reciprocity law fulfilled over a large range of fluence rates. The effe...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Appenroth KJ,Gabrys H

    更新日期:2001-01-01 00:00:00

  • Analytic formula for the clear-sky UV index.

    abstract::An approximate formula for the UV Index (UVI) under cloud-free, unpolluted, low surface albedo conditions is: UVI approximately 12.5mu(o)(2.42)(Omega/300)(-1.23) where mu(o) is the cosine of the solar zenith angle and Omega is the total vertical ozone column (in Dobson Units, DU). The dependence on mu(o) and Omega is ...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Madronich S

    更新日期:2007-11-01 00:00:00

  • Peculiar properties of photoinduced hydroxylaminolysis in different bacteriorhodopsin-based media using O-substituted hydroxylamines.

    abstract::The process of photoinduced hydroxylaminolysis has been re-examined in different bacteriorhodopsin (BR)-based media using O-substituted hydroxylamines, in particular, O-(4-nitrobenzyl) hydroxylamine hydrochloride (NBHA), O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine hydrochloride (FBHA) and O-(t-butyl) hydroxylamine h...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Dyukova TV,Druzhko AB

    更新日期:2010-11-01 00:00:00

  • Factors affecting M13 bacteriophage inactivation by methylene blue photosensitization.

    abstract::We have investigated the factors that affect the virucidal activity of methylene blue (MB) photosensitization. The M13 bacteriophage was more rapidly inactivated at higher temperatures (6 degrees C < 24 degrees C < 38 degrees C). Rate constants for inactivation were 0.072, 0.139 and 0.260 (log10 inactivation)/ (J/cm2)...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Abe H,Wagner SJ,Kuwabara M,Kamo N,Ikebuchi K,Sekiguchi S

    更新日期:1997-05-01 00:00:00

  • Reduction in DNA synthesis during two-photon microscopy of intrinsic reduced nicotinamide adenine dinucleotide fluorescence.

    abstract::Two-photon laser scanning microscopy (TPLSM) of endogenous reduced nicotinamide adenine dinucleotide (NAD(P)H) provides important information regarding the cellular metabolic state. When imaging the punctate mitochondrial fluorescence originating from NAD(P)H in a rat basophilic leukemia (RBL) cell at low laser powers...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Nichols MG,Barth EE,Nichols JA

    更新日期:2005-03-01 00:00:00

  • Protein diffusion probed by the transient grating method with a new type of photochromic molecule.

    abstract::A new type of photochromic molecule that can be used for diffusion coefficient (D) measurements of various proteins in solution is described. The absorption spectrum of this molecule is changed upon photoexcitation by the trans-cis isomerization reaction. Target proteins were labeled by this photochromic molecule in t...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Eitoku T,Terazima M

    更新日期:2008-07-01 00:00:00

  • Solar Ultraviolet Radiation Exposure and Sun Protection Behaviors and Knowledge Among a High-Risk and Overlooked Group of Outdoor Workers in South Africa.

    abstract::The exposure of outdoor car guards to solar ultraviolet radiation (UVR), the majority with deeply pigmented skin, to solar UVR was measured for five consecutive days during early spring (September 2017) in South Africa using electronic UVR dosimeters attached to the upper arm of each participant. The exposure of the n...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Nkogatse MM,Ramotsehoa MC,Eloff FC,Wright CY

    更新日期:2019-01-01 00:00:00

  • Cyanine Modification Tuned for Amine Photorelease.

    abstract::Cyanines are emerging as useful agents for photoreleasing biological compounds because of their capability of utilizing near-infrared (NIR) light. Another benefit is their ability to self-sensitize to produce singlet oxygen for the release of aryl amines, a process that has not been as feasible in the past. Here, we h...

    journal_title:Photochemistry and photobiology

    pub_type: 评论,杂志文章


    authors: Mathew JP,Greer A

    更新日期:2019-09-01 00:00:00

  • UVB radiation affects growth, reproduction and tissue structure of Daphnia magna across several temperatures.

    abstract::We examined the effects of daily exposure to UVB on growth, reproduction and histological characteristics of Daphnia magna over two generations at 20, 22, 25 and 30°C. Animals were exposed to 16 h of UVA and photosynthetically active radiation daily. Treated animals received 6 h of UVB during the light phase. Parental...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Huebner JD,Loadman NL,Wiegand MD,Huebner E,Palitsky DJ,Husarewycz WH

    更新日期:2013-01-01 00:00:00

  • The Photolyase/Cryptochrome Family of Proteins as DNA Repair Enzymes and Transcriptional Repressors.

    abstract::Light is a very important environmental factor that governs many cellular responses in organisms. As a consequence, organisms possess different kinds of light-sensing photoreceptors to regulate their physiological variables and adapt to a given habitat. The cryptochrome/photolyase family (CPF) includes photoreceptors ...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章,评审


    authors: Kavakli IH,Baris I,Tardu M,Gül Ş,Öner H,Çal S,Bulut S,Yarparvar D,Berkel Ç,Ustaoğlu P,Aydın C

    更新日期:2017-01-01 00:00:00

  • On spectral relaxation in proteins.

    abstract::During the past several years there has been debate about the origins of nonexponential intensity decays of intrinsic tryptophan (trp) fluorescence of proteins, especially for single tryptophan proteins (STP). In this review we summarize the data from diverse sources suggesting that time-dependent spectral relaxation ...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章,评审


    authors: Lakowicz JR

    更新日期:2000-10-01 00:00:00

  • Separation, identification and determination of luciferin in the Iranian firefly, Lampyris turkestanicus by HPLC and spectroscopic methods.

    abstract::Iranian firefly larvae, Lampyris turkestanicus collected from north of Iran and their luciferin were analyzed by HPLC, TLC, MS and spectroscopic Fourier transform ([FT]-IR, FT-NMR, UV and fluorescence) methods. The results showed that luciferin in L turkestanicus lanterns was the same as in the American firefly, Photi...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Hadj-Mohammadi MR,Chaichi MJ

    更新日期:1996-11-01 00:00:00