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The interaction of 1-anilino-8-naphthalenesulfonate with lipids: A nuclear magnetic resonance study

✍ Scribed by G.L. Jendrasiak; T.N. Estep

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
769 KB
Volume
18
Category
Article
ISSN
0009-3084

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✦ Synopsis

The proton magnetic resonance (PMR) and phosphorus magnetic resonance (PhMR) spectra of egg phosphatidylcholine in the presence of l-anilino-8-naphthalenesulfonate (ANS) have been studied. At low ratios of ANS to phospholipid, the spectra indicate that ANS molecules are in the lipid interface region where they interact with the head-group protons. ANS also penetrates into the hydrocarbon region to some extent. As the ANS/phospholipid ratio approaches one, a significant splitting of the head-group signal occurs. This splitting is associated with head-group signals from inner and outer molecules of the phospholipid vesicles. As the ANS/phospholipid ratio is further increased, a gel phase often occurs. The spectra for this gel phase suggest a highly mobile head-group. Further ANS addition results in a PMR spectrum suggestive of ANS-phospholipid micelle formation. The results for a phospholipid-cholesterol complex and for the total lipid extract from a cell membrane show that the ANS effect is more complicated in these cases.

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