Swelling Series and Bilayer Defects Due to Sample Preparation
作者:
S.C. Costigan,
P.J. Booth,
R.H. Templer,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 2000)
卷期:
Volume 352,
issue 1
页码: 59-66
ISSN:1058-725X
年代: 2000
DOI:10.1080/10587250008023161
出版商: Taylor & Francis Group
关键词: lecithin;aligned bilayers;X-ray diffraction
数据来源: Taylor
摘要:
One well known method to establish important structural determinants of lipid bilayers, is the Luzzati method [1]. Here lipid molecular length and area are calculated from the excess water point and the unit cell spacing, determined by x-ray diffraction of a swelling series. It has been found that this method often results in larger area per lipid values than those found by other methods. Data are presented here demonstrating that this is at least partially due to the sensitivity of this method to sample preparation. Different sample preparation methods influencing bilayer alignment and bilayer defects, were investigated. Freeze-drying in the capillary with no or minimal subsequent mechanical mixing, lead to area per lipid values that are in general agreement with those found in literature: 78.7±2.0 Å2for dioleoylphosphocholine (DOPC) at 25°C, and 75.3±2.7 Å2for dipalmitoleoylphosphocholine (DPolPC) at 15°C.
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