کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9757686 | 1496385 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Properties of ternary phospholipid/dimethyl sulfoxide/water systems at low temperatures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
X-ray diffraction, neutron diffraction and differential scanning calorimetry were used to investigate phase transitions in the ternary system phospholipid/dimethyl sulfoxide (DMSO)/water under cooling for three homologous phospholipids: dimyristoylphosphatidylcholine (DMPC), dipalmitoylphosphatidylcholine (DPPC), and distearoylphosphatidylcholine (DSPC). Below the temperature of ice formation from â40 to â113 °C, a new lamellar phase of DPPC and DSPC was found at and above a DMSO molar fraction of XDMSO = 0.05. Below XDMSO = 0.05 only a single dehydrated Lc-phase exists after ice formation. The new phase has an increased membrane repeat distance and coexists with a dehydrated Lc-phase. DPPC with a DMSO molar fraction of XDMSO = 0.07 shows a membrane repeat distance of the new phase of d = 6.61 ± 0.03 nm. The value of d increases at the increase of XDMSO. The new phase was not observed in the ternary system with DMPC. No correlation between the new phase and the glass transition of bound water in the intermembrane space was detected. The new phase was detected only in the systems with excess of water. The creation of the new phase demonstrates the specific DMSO interaction with hydrocarbon chains.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemistry and Physics of Lipids - Volume 133, Issue 2, February 2005, Pages 181-193
Journal: Chemistry and Physics of Lipids - Volume 133, Issue 2, February 2005, Pages 181-193
نویسندگان
M.A. Kiselev, T. Gutberlet, P. Lesieur, T. Hauss, M. Ollivon, R.H.H. Neubert,