徳島大学 教育・研究者情報データベース(EDB)

1. 徳島大学.工学部.生物工学科.生物機能工学講座

1. 玉井 伸岳([徳島大学.大学院社会産業理工学研究部.生物資源産業学域.応用生命系.応用生物資源学分野]/[徳島大学.生物資源産業学部.生物資源産業学科.応用生命講座])

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2. (英) Nambu Yuko

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3. (英) Tanaka Saeko

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4. 後藤 優樹([徳島大学.大学院社会産業理工学研究部.生物資源産業学域.応用生命系.応用生物資源学分野]/[徳島大学.生物資源産業学部.生物資源産業学科.応用生命講座])

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5. 松木 均([徳島大学.大学院社会産業理工学研究部.生物資源産業学域.応用生命系.応用生物資源学分野]/[徳島大学.生物資源産業学部.生物資源産業学科.応用生命講座])

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6. 金品 昌志

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(英) Volumetric characterization of ester- and ether-linked lipid bilayers by pressure perturbation calorimetry and densitometry

(英) We investigated the thermotropic volume behavior of dimyristoylphosphatidylcholine (DMPC), dipalmitoylphosphatidylcholine (DPPC) and dihexadecylphosphatidylcholine (DHPC) membranes using pressure perturbation calorimetry (PPC) and densitometry. The ln φ(2) vs temperature curves (φ(2): apparent molar volume of phospholipid) obtained from the PPC data using an analysis method that we developed agreed with the results from the density measurements for these lipids within the relative difference of about 0.62%. From those curves, the volume changes with the main transition were estimated at 18.0±0.49, 23.5±2.33 and 23.0±0.33 cm(3) mol(-1) for DMPC, DPPC and DHPC, respectively. For DPPC and DMPC, the average volume per methylene group of the hydrocarbon chains v(CH2) calculated by referring to the procedure by Nagle and Wilkinson was consistent with the previous result, which indicates that the DPPC bilayer in the gel state has denser hydrophobic bilayer core than the DMPC bilayer. For DHPC, the volume of the headgroup region v(H) was calculated to be 244 Å(3) by assuming that v(CH2) of DHPC equals that of DPPC above 45°C. This value was comparable to that of DPPC when the volume of the carbonyl groups was considered, which may signify that there is no significant conformational difference in the polar headgroups of both phospholipids. However, it was suggested from the consideration on v(H) of DHPC at 20°C that expansion of the headgroup region should occur as the interdigitated structure is formed, which means some conformational change of the headgroup region is induced by the interdigitation.

1. (英) 1,2-Dipalmitoylphosphatidylcholine
2. (英) Calorimetry
3. (英) Densitometry
4. (英) Dimyristoylphosphatidylcholine
5. (英) Esters
6. (英) Ether, Ethyl
7. (英) Lipid Bilayers
8. (英) Phospholipid Ethers
9. (英) Pressure
10. (英) Temperature

1. (英) Article.ELocationID: 10.1016/j.colsurfb.2011.11.055

2. (英) Article.Affiliation: Department of Life System, Institute of Technology and Science, The University of Tokushima, Tokushima, Japan.

3. (英) Article.PublicationTypeList.PublicationType: Journal Article