Lipolysis of didecanoyl-lecithin/triolein mixed monolayers by phospholipaseA
2 |
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| Authors: | M A Alsina M L Garcia M Espina O Valls |
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| Institution: | (1) Physical-Chemistry Unity, Department of Pharmacy, Health Science Division, Barcelona University, Barcelona, Spain;(2) Present address: Facultad de Farmacia, Departamento de Farmacia, Unidad de Fisico-Quimica, NÚcleo Universitario de Pedralbes, Avda. Diagonal s/n, 08028 Barcelona, Spain |
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| Abstract: | A study of enzyme lipolysis by pancreatic phospholipaseA
2 and by vipera berus phospholipaseA
2 on monomolecular mixed films of didecanoyl-lecithin and triolein on an aqueous subphase of pH 8 has been carried out. The influence of the composition of the mixed film, the surface pressure of the film and the amount and type of the injected enzyme on the lipolysis rate were studied.In order to relate the lipolytic activity with the monolayer state, the compression isotherms of the didecanoyl-lecithin/triolein mixed monolayers have also been obtained.The resuls are compared to observations on lipolytic activity of phospholipaseA
2 on the didecanoyl-lecithin/cholesterol mixed monolayers. Triolein improves the kinetic conditions of the lipolysis of lecithin films in a higher degree than cholesterol. Probably it increases the enzyme penetration by the fluidifying effect exerted on the lecithin monolayers. |
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| Keywords: | Triolein cholesterol enzymelipolysis pancreaticphospholipase films ofdidecanoyl-lecithin surfacepressure |
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