Abstract:
:A new acoustical method for the investigation of lipid phase transition is introduced based on the measurement of the thermal acoustic radiation (TAR) inherent in lipids. The TAR of multilamellar vesicles from dipalmitoylphosphatidylcholine (DPPC) and dimyristoylphosphatidylcholine (DMPC) was measured in the megahertz range and the variations in the radiation intensity during the lipid phase transition were recorded. Two types of variations are possible: if the temperature of the vesicles decreases (in the process of transition from the liquid crystalline state to the gel state) then the TAR intensity increases, and if the temperature increases (in the reverse transition) then the TAR intensity decreases. These effects are connected with an increase in the ultrasonic absorption in the vesicles under lipid phase transition. Basing on the results of the TAR investigation, a new theoretical estimate has been developed of the variation in the absorption coefficient during the lipid phase transition. In this estimate, the variation is equated to the ratio of the phase transition entropy to the gas constant.
journal_name
Chem Phys Lipidsjournal_title
Chemistry and physics of lipidsauthors
Anosov AA,Barabanenkov YN,Kazanskij AS,Less YA,Sharakshane ASdoi
10.1016/j.chemphyslip.2008.03.001subject
Has Abstractpub_date
2008-06-01 00:00:00pages
81-4issue
2eissn
0009-3084issn
1873-2941pii
S0009-3084(08)00046-7journal_volume
153pub_type
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更新日期:1990-09-01 00:00:00
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