The effect of phase transition on the photochemical reactions in liposome system containing amphiphilic dye is studied. The fluorescence intensity of the amphiphilic cyanine dye with two long alkyl chains, N,N prime -distearylthiacarbocyanine bromide, which is incorporated into bilayer liposome, is considerably modified by the fluid-solid phase transition of the lipid layer, while the fluorescence of the cyanine dye with one long alkyl chain, N-stearyl-N prime -methylthiacarbocyanine bromide, was not affected by the phase transition. These results were interpreted in terms of the suppression of the twisting motion of the chromophores around the bridging bond in the excited singlet state. Factors affecting the photoinduced coupling of redox reactions across bilayer membrane, i. e. reduction of Fe(CN)//6**3** minus in outside aqueous phase of liposome and oxidation of potassium ascorbate in inside solution, are also studied using chlorophyll a incorporating liposome. It is found that phase transition exerts the influence on the fluorescence intensity of chlorophyll a, and on the rate of bimolecular reaction of chlorophyll a with water-soluble species.
|Number of pages||10|
|Journal||Molecular Crystals and Liquid Crystals|
|Publication status||Published - 1981|
|Event||Proc of the Int Liq Cryst Conf, 8th, Pt D - Kyoto, Jpn|
Duration: 1980 Jun 30 → 1980 Jul 4
ASJC Scopus subject areas