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31P NMR study of head group behavior in sonicated phosphatidylcholine liposomes in the gel and in the liquid state

✍ Scribed by Vincenza Viti; Maurizio Minetti

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
470 KB
Volume
28
Category
Article
ISSN
0009-3084

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✦ Synopsis

We measured the 31P[tH] Nuclear Overhauser Effect (NOE) as a function of temperature and of aH irradiation frequency, the linewidth Avaa as a function of temperature and the relaxation time T1 above and below the thermal transition temperature, of the 3tP-NMR signal in sonicated liposomes of 1,2-dimiristoyl-3-sn-phosphatidylcholine (DMPC), 1,2-dipalmitoyl-3sn-phosphatidylcholine (DPPC) and 1,2-distearoyl-3-sn-phosphatklylcholine (DSPC). The same measurements were repeated in the presence of high molecular weight dextrans. They strongly reduce the NOE and produce longer relaxation times T1. According to the current models, we were able to evaluate, in the different situations, the correlation time of the internal motion r G and the distance r between interacting groups in the region of the polar head groups. While the first parameter changes abruptly through the phase transition and under the effect of dextrans, the latter does not appear modified in any case. These results are discussed in terms of a conformational change of the phosphocholine head groups.

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