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Calorimetric detection of a sub-main transition in long-chain phosphatidylcholine lipid bilayers.

Authors
  • Jørgensen, K
Type
Published Article
Journal
Biochimica et Biophysica Acta
Publisher
Elsevier
Publication Date
Dec 13, 1995
Volume
1240
Issue
2
Pages
111–114
Identifiers
PMID: 8541280
Source
Medline
License
Unknown

Abstract

The existence of a sub-main transition in multilamellar bilayers composed of long-chain saturated diacyl phosphatidylcholine (DC17PC, DC18PC, DC19PC, and DC20PC) is reported for the first time using high-sensitivity differential scanning calorimetry. The highly cooperative sub-main transition which takes place over a narrow temperature range positioned between the well-known pre-transition and main-transition is characterized by a heat capacity curve with a half-height width of delta T1/2 congruent to 0.15 C degrees and an enthalpy change, delta H, which is a few percent of the transition enthalpy for the main-transition of the lipid bilayer.

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