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40
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Text
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n/a
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Pages
11-20
Issue
1
Volume
70
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Title
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Anomalous Phase Transition In Dipalmitoylphosphatidylethanolamine/palmitoylphosphatidylcholine/water System
Publisher
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Biophysical Chemistry
Date
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1998
1998-01
Subject
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bilayer; Biochemistry & Molecular Biology; Biophysics; Chemistry; compressibility; DSC; lysolecithin; lysophosphatidylcholine; membrane; NMR; permeability; phase transition; phosphatidylcholine vesicles; phosphatidylethanolamine; phospholipid; phospholipid-vesicles; translocation; volumetric
Creator
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La Rosa C; Grasso D; Checchetti A; Golemme A; Chidichimo G; Westerman P
Description
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An anomalous phase transition with a marked rise in specific heat, the isobaric thermal expansion coefficient, and the compressibility coefficient at 62.5 degrees C for an equimolar mixture of 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE) and 1-palmitoyl-sn-glycero-3-phosphocholine (PLPC), in water (34 wt.%) has been shown by differential scanning calorimetry, scanning dilatometry and isothermal compressibility measurements. This transition occurs 15 degrees C above a first-order transition observed in the same system, P-31 and H-2 nuclear magnetic resonance results are consistent with the occurrence of 'defects' in the bilayer in the temperature range between the first and the anomalous phase transitions, It is proposed that conically, PLPC molecules prefer regions with high curvature in the defective bilayer, while DPPE molecules are mostly confined to the flat regions of the bilayers. (C) 1998 Elsevier Science B.V.
Identifier
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n/a
Format
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Journal Article or Conference Abstract Publication
1998
bilayer
Biochemistry & Molecular Biology
Biophysical Chemistry
Biophysics
Checchetti A
Chemistry
Chidichimo G
compressibility
DSC
Golemme A
Grasso D
Journal Article or Conference Abstract Publication
La Rosa C
lysolecithin
lysophosphatidylcholine
membrane
nmr
Permeability
phase transition
phosphatidylcholine vesicles
phosphatidylethanolamine
phospholipid
phospholipid-vesicles
Translocation
volumetric
Westerman P