The molecular interactions between Nd^(3+), Gd^(3+)and Yb^(3+) and DPPC in multibilayer have been studied by Fourier transform infrared spectroscopy. The results show that incorporations of the lanthanide ions conside...The molecular interactions between Nd^(3+), Gd^(3+)and Yb^(3+) and DPPC in multibilayer have been studied by Fourier transform infrared spectroscopy. The results show that incorporations of the lanthanide ions considerably shift the gel to liquid-crystal phase transition to higher temperatures. The incorporations of Gd^(3+) and Yb^(3+) obviously reduce the cooperations of the transition. The phosphate region of the spectra indicates that the Ln^(3+) binding to DPPC forms DPPC-Ln^(3+)complex and the Lna^(3+)binding is not dependent on the phase state of DPPC. The C-H stretching region of the spectra suggests that the incorporation of Ln^(3+)increases the conformational order of DPPC both in gel and in liquid-crystal phase as a result of the reduction of gauche rotamers.展开更多
The vibrational spectra of both pure DPPC liposomes and DPPC multilayers reconstituted with Ge-132 are reported as a function of temperature from 290 to 330K.The results show that the addition of Ge-132 results in sup...The vibrational spectra of both pure DPPC liposomes and DPPC multilayers reconstituted with Ge-132 are reported as a function of temperature from 290 to 330K.The results show that the addition of Ge-132 results in suppression of the pretransition behavior and reduction of temperature of the main transition for reconstituted system.The results also show that the degree of rigidity of the acyl chain in the presence of Ge-132 is lower than that in pure DPPC dispersion within the investigated temperature range.展开更多
文摘The molecular interactions between Nd^(3+), Gd^(3+)and Yb^(3+) and DPPC in multibilayer have been studied by Fourier transform infrared spectroscopy. The results show that incorporations of the lanthanide ions considerably shift the gel to liquid-crystal phase transition to higher temperatures. The incorporations of Gd^(3+) and Yb^(3+) obviously reduce the cooperations of the transition. The phosphate region of the spectra indicates that the Ln^(3+) binding to DPPC forms DPPC-Ln^(3+)complex and the Lna^(3+)binding is not dependent on the phase state of DPPC. The C-H stretching region of the spectra suggests that the incorporation of Ln^(3+)increases the conformational order of DPPC both in gel and in liquid-crystal phase as a result of the reduction of gauche rotamers.
文摘The vibrational spectra of both pure DPPC liposomes and DPPC multilayers reconstituted with Ge-132 are reported as a function of temperature from 290 to 330K.The results show that the addition of Ge-132 results in suppression of the pretransition behavior and reduction of temperature of the main transition for reconstituted system.The results also show that the degree of rigidity of the acyl chain in the presence of Ge-132 is lower than that in pure DPPC dispersion within the investigated temperature range.
