| Literature DB >> 6893416 |
J Umemura, D G Cameron, H H Mantsch.
Abstract
The temperature dependencies of the infrared spectra of pure and cholesterol-containing multibilayers of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine were studied using Fourier transform infrared techniques. A comparison of the spectroscopic data showed the retention of a melting phenomenon at 60 mol% cholesterol content, and the retention of some all-trans conformations in the liquid-crystalline phase. It is also demonstrated that at temperatures less than 30 degrees C, the cholesterol-containing 1,2-dipalmitoyl-sn-glycero-3-phosphocholine multibilayers still contain a small amount of pure 1,2-dipalmitoyl-sn-glycero-3-phosphocholine, packed in an orthorhombic subcell lattice. Spectral changes were found in the absorptions characteristic of the phospholipid head groups. The addition of cholesterol results in changes in the ester bands, and demonstrates the induction by cholesterol of non-equivalent ester conformations.Entities:
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Year: 1980 PMID： 6893416 DOI： 10.1016/0005-2736(80)90287-4
Source DB: PubMed Journal: Biochim Biophys Acta ISSN： 0006-3002