AC Calorimetric Studies of Main Transition in Dipalmitoylphosphatidylcholine (DPPC)

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概要

• 論文の詳細を見る

• The main phase transition in dipalmitoylphosphatidylcholine (DPPC) Iiposomeswas studied with 0.03 Hz ac calorimetry. Water suspensions with 6.25 wt% DPPCand 15.0wt% DPPC were measured with a slow temperature scanning rate of 0.12K/ h through the transition on heating and on cooling. These studies revealed a fairlynarrow C, peak at the main transition with a hysteresis of about 0.1 K. The integratedarea of the excess C. peak observed on heating corresponds to an enthalpy of 6kJ/ mol of DPPC in both samples. This value is much smaller than the tota]?latentheat of 38.8 kJ / mol obtained from adiabatic calorimetry, which indicates that theraLc of phase conversion is quite slow. Pretransitional fluctuation contributions to C,were very small both above and below the coexistence region for the main transition.No C. anomalies were seen at the pre- or sub-transition even at the low frequency of0.03 I-I,.

• 社団法人日本物理学会の論文
• 1987-11-15

著者

• Garland C

  Massachusetts Inst. Technology Ma Usa

• Imaizumi Shigeo

  Department Of Applied Physics Faculty Of Engineering Nagoya University:suzuka College Of Technology

• Imaizumi Shigeo

  Department Of Chemistry And Center For Material Science And Engineering Massachusetts Institute Of T

• W.GARLAND Carl

  Department of Chemistry and Center for Material Science and Engineering,Massachusetts Institute of T

• W.garland Carl

  Department Of Chemistry And Center For Material Science And Engineering Massachusetts Institute Of T

• Garland Carl

  Department of Chemistry and Center for Material Science and Engineering,Massachusetts Institute of Technology

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