both the broadening of lecithin and [ 4-13c ] cholesterol carbon resonances by mn2+ and the observation of surface dilution kinetics for phospholipase a2 ( naja naja naja ) and phospholipase c ( bacillus cereus ) hydrolysis of the lecithins indicate that the cholesterol 3 beta-hydroxyl group resides at the particle surface exposed to solvent .
C0031667
phospholipase a2
C0020291
hydrolysis