INVESTIGADORES
LAGORIO MarÍa Gabriela
artículos
Título:
Microcrystalline cellulose as a carrier for hydrophobic photosensitizers in water
Autor/es:
ANDRÉ ZEUG, JOERG ZIMMERMANN, BEATE ROEDER, M. GABRIELA LAGORIO AND ENRIQUE SAN ROMÁN
Revista:
Photochemical and Photobiological Sciences
Editorial:
RSCPublishing
Referencias:
Lugar: Cambridge; Año: 2002 vol. 1 p. 198 - 203
ISSN:
1474-905X
Resumen:
Samples of pheophorbide-a adsorbed on microcrystalline cellulose, which have been previously characterized in the
solid state (M.G. Lagorio, E. San Roman, A. Zeug, J. Zimmermann and B. Röder, Phys. Chem. Chem. Phys., 2001,Phys. Chem. Chem. Phys., 2001,
3, 1524?1529), were washed with water, leading to stable suspensions of ultra.ne particles (d < 2 µm) carrying
photoactive, monomeric dye molecules. Detachment can be controlled through the particle size distribution.
Suspensions are .uorescent and generate singlet molecular oxygen e.ciently. A similar e.ect has been observed
on washing samples containing hematoporphyrin IX adsorbed on the same support. Thus, using cellulose as a
heterogeneous carrier, it is possible to introduce hydrophobic photosensitizers into the aqueous medium while
avoiding aggregation, thus preserving their photophysical properties. At the same time, the spectroscopic properties
of dyes attached to cellulose particles are compared with those in ethanol and ethanol?water mixtures and their
di.erences are explained in terms of medium polarity and dye aggregation.
on washing samples containing hematoporphyrin IX adsorbed on the same support. Thus, using cellulose as a
heterogeneous carrier, it is possible to introduce hydrophobic photosensitizers into the aqueous medium while
avoiding aggregation, thus preserving their photophysical properties. At the same time, the spectroscopic properties
of dyes attached to cellulose particles are compared with those in ethanol and ethanol?water mixtures and their
di.erences are explained in terms of medium polarity and dye aggregation.
photoactive, monomeric dye molecules. Detachment can be controlled through the particle size distribution.
Suspensions are .uorescent and generate singlet molecular oxygen e.ciently. A similar e.ect has been observed
on washing samples containing hematoporphyrin IX adsorbed on the same support. Thus, using cellulose as a
heterogeneous carrier, it is possible to introduce hydrophobic photosensitizers into the aqueous medium while
avoiding aggregation, thus preserving their photophysical properties. At the same time, the spectroscopic properties
of dyes attached to cellulose particles are compared with those in ethanol and ethanol?water mixtures and their
di.erences are explained in terms of medium polarity and dye aggregation.
on washing samples containing hematoporphyrin IX adsorbed on the same support. Thus, using cellulose as a
heterogeneous carrier, it is possible to introduce hydrophobic photosensitizers into the aqueous medium while
avoiding aggregation, thus preserving their photophysical properties. At the same time, the spectroscopic properties
of dyes attached to cellulose particles are compared with those in ethanol and ethanol?water mixtures and their
di.erences are explained in terms of medium polarity and dye aggregation.
, 1524?1529), were washed with water, leading to stable suspensions of ultra.ne particles (d < 2 µm) carrying
photoactive, monomeric dye molecules. Detachment can be controlled through the particle size distribution.
Suspensions are .uorescent and generate singlet molecular oxygen e.ciently. A similar e.ect has been observed
on washing samples containing hematoporphyrin IX adsorbed on the same support. Thus, using cellulose as a
heterogeneous carrier, it is possible to introduce hydrophobic photosensitizers into the aqueous medium while
avoiding aggregation, thus preserving their photophysical properties. At the same time, the spectroscopic properties
of dyes attached to cellulose particles are compared with those in ethanol and ethanol?water mixtures and their
di.erences are explained in terms of medium polarity and dye aggregation.
on washing samples containing hematoporphyrin IX adsorbed on the same support. Thus, using cellulose as a
heterogeneous carrier, it is possible to introduce hydrophobic photosensitizers into the aqueous medium while
avoiding aggregation, thus preserving their photophysical properties. At the same time, the spectroscopic properties
of dyes attached to cellulose particles are compared with those in ethanol and ethanol?water mixtures and their
di.erences are explained in terms of medium polarity and dye aggregation.
.uorescent and generate singlet molecular oxygen e.ciently. A similar e.ect has been observed
on washing samples containing hematoporphyrin IX adsorbed on the same support. Thus, using cellulose as a
heterogeneous carrier, it is possible to introduce hydrophobic photosensitizers into the aqueous medium while
avoiding aggregation, thus preserving their photophysical properties. At the same time, the spectroscopic properties
of dyes attached to cellulose particles are compared with those in ethanol and ethanol?water mixtures and their
di.erences are explained in terms of medium polarity and dye aggregation..erences are explained in terms of medium polarity and dye aggregation.
