Abstract

Erythrocyte membranes from rats raised on a diet with low content of essential fatty acids were studied by osmotic sensitivity tests and spin labeling techniques. This diet induced significant modifications in acylglycerophosphocholine fatty acid composition with regard to 16 : 1, 18 : 1, 18 : 2 ( n-6), 20 : 3 ( n-9), and 20 : 4 ( n-6). No changes in membrane fluidity as monitored by spin label motion were found but the diet caused an increased osmotic sensitivity in essential fatty acid deficient erythrocytes. 50% hemolysis was obtained at a 51.0% dilution of saline with H 2O as compared to a 57.0% dilution for the control material. Membrane fluidity was unaffected by γ-irradiation up to 80 krad.

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