Hydration effects under near-infrared radiation

Changes in liposome membrane surface properties induced by near-infrared radiation (NIR) have been observed using two methods: spin labels and microscope observations. Multilamellar liposomes were prepared from egg yolk phosphatydylcholine (PC). Isotropic tumbling correlation time ( τ c) for PC lipo...

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Bibliographic Details
Published in:Colloids and surfaces, B, Biointerfaces B, Biointerfaces, 2002-10, Vol.26 (3), p.223-233
Main Authors: Komorowska, Małgorzata, Gałwa, Magdalena, Herter, Blanka, Wesołowska, Urszula
Format: Article
Language:English
Subjects:
Agglomeration
Egg yolk phosphatydylcholine
Hydration
Liposomes
Near-infrared
Phase transition
Spin labels
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Summary:Changes in liposome membrane surface properties induced by near-infrared radiation (NIR) have been observed using two methods: spin labels and microscope observations. Multilamellar liposomes were prepared from egg yolk phosphatydylcholine (PC). Isotropic tumbling correlation time ( τ c) for PC liposome membranes, calculated from EPR spectra, increased after irradiation (700–2000 nm). Both the Arrhenius plot temperature of discontinuity for the TEMPO-palmitate (TP) spin probe correlation time incorporated into the PC bilayer, and calculated activation energy of its mobility are shifted towards higher values after irradiation, but only at neutral pH. The ability of liposomes to agglomerate was modified considerably by irradiation when observed under optical microscope. All observed phenomena have been discussed as a result of NIR hydration effects.
ISSN:0927-7765
1873-4367
DOI:10.1016/S0927-7765(02)00002-4