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Laser-mediated variations in merocyanine 540 incorporation into phospholipid membranes

The influence of Nd/YAG laser irradiation (532 nm) on the MC-540 stained POPC and DMPC liposomes (lipid:dye ratio 42:1 - 20:1) was studied by absorption spectroscopy in the range of 380 - 700 nm. Two absorption bands (533 nm and 567 nm) corresponding to two colored species of the dye -- monomers and dimers -- were observed for MC-540 in phospholipid liposomes. MC-40 monomer-dimer distribution was shown to depend on the liposome composition and lipid:dye ratio. Irradiation of the samples by laser light of fluence rate 3000 W/m2 resulted only in MC-540 monomer-dimer distribution changes. The variation of this effect was observed as the kind of liposomes (alcoholic or ultrasonic) were changed. MC-540 monomer-dimer distribution is one of the factors that affect the dye- mediated photoinactivation. Illumination by intensive laser light (60,000 W/m2) caused color fading of the MC-540 dye.