Modified Candida rugosa and Pseudomonas cepacia lipase (CRL and PCL) were co-lyophilized with two pairs of synthetic diastereoisomeric amphiphiles, D- and L-2-(3-{bis-[3-(2,3,4,5,6-pentahydroxy- hexanoylamino)-propyl]carbamoyl}- propionylamino)- pentanedioic acid didodecyl ester (D- and L-BIG2C12CA); D- and L-2-(2,3,4,5,6-pentahydroxy- hexanoylamino)- pentanedioic acid didodecyl ester (D- and L-2C(12)GE). Enzyme activities of the modified lipase in the transesterification in organic solvent were evaluated. Both pairs of the diastereoisomeric amphiphiles showed enhanced enzyme activity in the transacetylation between racemic sulcatol and isopropenyl acetate in diisopropyl ether, catalyzed by the PCL-co-lyophilizate, by 19 - 48 fold when compared to the native lipase lyophilized from buffer alone independent of the stereochemistry of the amphiphiles, while in the case of the CRL-co-lyophilizate only the L-BIG2C(12)CA showed enhanced enzyme activity in the transbutyrylation between racemic solketal and vinyl butyrate in cyclohexane as high as 68 - 78 fold.