Abstract
1. 1. Outer and inner membranes were isolated from cauliflower bud ( Brassica oleracea L., CV Botrytis) mitochondria in the presence of nupercaine to prevent phospholipid hydrolysis by an endogenous phospholipase A. 2. 2. Outer membranes are characterized by a high content of phosphatidyl-inositol and, to a lesser extent, of phosphatidylglycerol. They contain only very small amounts of diphosphatidylglycerol, which is specifically localized in the inner membranes. 3. 3. Fatty acids of outer membrane phospholipids are mostly saturated, in marked contrast to those of inner membranes, which are predominantly unsaturated. This fact could account for the difference of plasticity observed between the two mitochondrial membranes. 4. 4. Compared to outer membranes, microsomes have a much higher content in phosphatidylcholine and phosphatidylethanolamine. The degree of saturation of their fatty acids is intermediate between those of the fatty acids in inner and outer mitochondrial membranes.
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