Abstract
The activation of lipase from Pseudomonas fluorescens (PFL) upon its immobilization in surfactant coprecipitates (hexadecane-1,2-diol (HDD), cetyl alcohol (CetOH), N-cetylacetamide (CetAA), and cetylamine (CetNH2)) organized in monolayers at the interface were studied by the Langmuir—Blodgett monolayer technique. Incorporation of the enzyme into surfactant monolayers at the surface pressure π = 10 mN m–1 results in an apparent increase in the area per molecule. In the series of noncharged surfactants CetOH—HDD—CetAA, this effect increases in proportion to the amount of the enzyme incorporated in the monolayer. The catalytic activity of the lipase—surfactant coprecipitates in an organic solvent as regards esterification increases in the same sequence, indicating similarity of the interaction of lipase with surfactant monolayers and coprecipitates. For π = 10 mN m–1, the CetNH2 monolayer with liquid-expanded state incorporates the largest amount of the enzyme (PFL : CetNH2 = 1 : 290); the CetOH monolayer, which exists in the condensed state under the same conditions, incorporates the smallest amount (PFL : CetOH = 1 : 1700). The hydrolytic activity of PFL in mixed monolayers with surfactants increases 1.5—11-fold; the esterification activity in surfactant coprecipitates, 1.6—9-fold. The lipase activation effects are explained by facilitated transport of substrates into mixed monolayers and surfactant—enzyme precipitates in aqueous and organic media, respectively.
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Gorokhova, I.V., Ivanov, A.E., Zaitsev, S.Y. et al. Study of the interaction and activation of lipase from Pseudomonas fluorescens in surfactant monolayers and precipitates. Russian Chemical Bulletin 52, 1013–1021 (2003). https://doi.org/10.1023/A:1024437401394
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DOI: https://doi.org/10.1023/A:1024437401394