We propose to look at the interaction of the aggregates two phospholipids form with two phospholipase (PL) enzymes, PLA2 and PLC, which hydrolyse different ester groups in the lipid molecule and therefore produce different reaction products. It is well known that the length of the fatty acid chain in a phopholipid molecule dictates the nature and size of the aggregates a phospholipid forms upon dispersal in water and consequently its interaction with PL. In the present study we have chosen two small phosphocholine lipids, one with a 7-carbon and one with a 6-carbon fatty acid chain, where the latter forms spherical micelles while the former rod-shaped micelles. SANS measurements coupled with stopped flow methodology and using contrast variation will be used to determine the kinetics of the interaction and the rate of destruction of the micellar aggregates.