Poly(ethylene glycol)-lipase complexes catalytically active in fluorous solvents.

Area of Science:

• Biocatalysis
• Green Chemistry
• Enzyme Engineering

Background:

• Lipase-catalyzed reactions are crucial in organic synthesis.
• Fluorous solvents offer unique properties for chemical processes.
• Immobilization of enzymes can enhance their stability and activity.

Purpose of the Study:

• To investigate lipase-catalyzed alcoholysis in fluorous solvents.
• To evaluate the performance of a poly(ethylene glycol)-lipase complex in these solvents.
• To understand the influence of reaction conditions and substrate inhibition.

Main Methods:

• Lipase PL was complexed with poly(ethylene glycol) (PEG).
• Alcoholysis of vinyl cinnamate with benzyl alcohol was performed in fluorous solvent FC-77.
• The effect of co-solvents, temperature, pH, and substrate concentration was analyzed.

Main Results:

• The PEG-lipase complex showed a 16-fold increase in activity compared to native lipase.
• Markedly higher activities were observed in fluorous solvents than in conventional organic solvents.
• Optimal reaction temperature was 55°C in FC-77, and optimal pH for complex preparation was 9.0.
• Substrate inhibition by vinyl cinnamate was observed at lower concentrations in fluorous solvents.

Conclusions:

• Lipase-catalyzed reactions are feasible and enhanced in fluorous solvents using PEG-lipase complexes.
• The PEG layer facilitates substrate localization, improving catalytic efficiency.
• This work presents a novel application of fluorous solvents in enzymatic synthesis.