Abstract
The temperature-dependent fluidity of lamellar and Ca 2+-precipitated cardiolipin structures was investigated over the temperature range 5–55 °C, using the stearic acid spin labels I(12.3), I(5.10), and I(1.14). In the lamellar phase the I(12.3) label reflects an abrupt thermotropic change of the membrane fluidity at 37 °C. The I(5.10) and I(1.14) labels show two points of phase changes located at 14, 36 °C and 10, 38 °C, respectively. The Ca 2+-complexed cardiolipin structures provoke a retraction of the hydrocarbon chains, preferentially in the polar region, and at the same time a loss of the phase transitions.
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