Results 171 to 180 of about 3,607 (204)

Synthesis and Properties of Pheophorbide-Quinone Compounds

Bulletin of the Chemical Society of Japan, 1992
Abstract New pheophorbide-quinone derivatives with a different kind of quinone moieties were synthesized by mixed anhydride method. The structures of these compounds were confirmed by UV, IR, 1H NMR, fluorescence, and mass spectra. Effective fluorescence quenching of the pheophorbide chromophores in the synthesized molecules was observed
Victor V Borovkov, Alexander A Gribkov, Andrei N Kozyrev, Alexander S Brandis, Akito Ishida, Yoshiteru Sakata   +5 more
openaire   +1 more source

Synthesis of the conjugate of ortho-isobornylphenol with pheophorbide (a)

Mendeleev Communications, 2006
The introduction of a terpenophenolic fragment to the periphery of a chlorin cycle has been carried out.
Evgeny V. Buravlev, Irina Yu. Chukicheva, Dmitrii V. Belykh, Aleksandr V. Kutchin   +3 more
openaire   +1 more source

Light-Harvesting Nanorods Based on Pheophorbide-Appending Cellulose

Biomacromolecules, 2013
In contrast to the success in artificial DNA- and peptide-based nanostructures, the ability of polysaccharides to self-assemble into one-, two-, and three-dimensional nanostructures are limited. Here, we describe a strategy for designing and fabricating nanorods using a regioselectively functionalized cellulose derivative at the air-water interface in ...
Keita, Sakakibara, Mari, Granström, Ilkka, Kilpeläinen, Juho, Helaja, Santtu, Heinilehto, Rintaro, Inoue, Toshiji, Kanaya, Jonathan P, Hill, Fumiaki, Nakatsubo, Yoshinobu, Tsujii, Katsuhiko, Ariga   +10 more
openaire   +2 more sources

Photocytotoxic Pheophorbide-Related Compounds fromAglaonema simplex

Chemistry & Biodiversity, 2005
In our screening program for new photosensitizers from the Malaysian biodiversity, we found five pheophorbide-related compounds from the leaves and stems of Aglaonema simplex. Detailed spectroscopic analyses showed that compounds 1-3 and 5 are pheophorbide and hydroxy pheophorbide derivatives of chlorophyll a and b.
Chin-Fei, Chee, Hong Boon, Lee, Hean Chooi, Ong, Anthony Siong-Hock, Ho   +3 more
openaire   +2 more sources

Purification of chlorophylls, pheophytins and pheophorbides for specific activity determinations

Biochimica et Biophysica Acta, 1962
Abstract Methods for the purification of 14 C-labelled chlorophylls a and b and of their respective pheophytins, pheophorbides and pyropheophorbides, to constant specific activity are presented. Data are provided showing the specific activities of these compounds obtained from a variety of plants which had been fed [I- 14 C]acetate, [2- 14 C ...
H J, PERKINS, D W, ROBERTS
openaire   +2 more sources

Potent virucidal effect of pheophorbide a and pyropheophorbide a on enveloped viruses

Journal of Natural Medicines, 2010
In this study, we evaluated the inhibitory effect of ethanol and aqueous extracts from a stem of Opuntia ficus indica on replication of three kinds of viruses: two enveloped viruses [herpes simplex virus type 2 (HSV-2), influenza A virus (IFV-A)], and one non-enveloped virus [poliovirus type 1 (PV-1)].
Lamjed, Bouslama, Kyoko, Hayashi, Jung-Bum, Lee, Abdelwahed, Ghorbel, Toshimitsu, Hayashi   +4 more
openaire   +2 more sources

Effective photocleavage of DNA by pheophorbide a.

Nucleic acids symposium series, 1992
Remarkably effective photocleavage of plasmid DNA with pheophorbide a, as a visible light sensitizer, has been found for the first time. DNA is photocleaved even in the absence of oxygen. The novel oxygen-independent scission is ascribed to specific photodynamic function of the ring V in pheophorbide a.
M, Kobayashi, M, Harada, M, Komiyama
openaire   +1 more source

Electrophilic substitution at the δ-methine bridge of pheophorbide and ′

Tetrahedron Letters, 1981
Abstract A chloro-substituted derivative was prepared from chlorophyll a ′. The derivative was shown to be δ-chloro-methyl pheophorbide a by UV/VIS, MS and ′H NMR.
Paavo H. Hynninen, Simo Lötjönen
openaire   +1 more source

Pheophorbides as photosensitizers for the photodynamic therapy of tumors

Proceedings of SPIE, 1995
Quantum yields for formation of singlet molecular oxygen have been measured for sodium pheophorbides (Na-Phdes) a and b in aqueous and non-aqueous media. Measurements have been made for both steady-state and pulsed laser excitation with the resultant singlet molecular oxygen being detected by photo-oxygenation reactions or time-resolved luminescence ...
openaire   +1 more source

Transesterification of the α-keto ester in methyl pheophorbide-a

Tetrahedron Letters, 1996
Abstract Transesterification of the α-keto methyl ester in methyl pheophorbide-a proceeds smoothly under neutral conditions, allowing the preparation of a variety of models such as steroid-pheophorbide, pyromellitimide-pheophorbide, thymidine-pheophorbide, pheophorbide dimer, and porphyrin-pheophorbide.
Satoshi Shinoda, Atsuhiro Osuka
openaire   +1 more source