Short-chain aliphatic ester synthesis using Thermobifida fusca cutinase

Area of Science:

• Biotechnology
• Enzyme Catalysis
• Food Chemistry

Background:

• Short-chain aliphatic esters are vital food flavorings.
• Enzyme-catalyzed synthesis offers a sustainable alternative to traditional methods.

Purpose of the Study:

• To investigate the efficacy of Thermobifida fusca (T. fusca) cutinase for synthesizing aliphatic esters.
• To optimize reaction conditions for maximum ester yield.
• To assess the enzyme's tolerance and selectivity for industrial applications.

Main Methods:

• Utilized T. fusca cutinase for esterification reactions.
• Optimized enzyme concentration, temperature, and water content.
• Evaluated enzyme tolerance to varying water and acid concentrations.
• Determined chain length selectivity for different acids and alcohols.

Main Results:

• Achieved a maximum ethyl caproate yield of 99.2% under optimized conditions (50U/ml cutinase, 40°C, 0.5% water).
• Demonstrated high enzyme tolerance to water (up to 8%) and acid (up to 0.8M) concentrations.
• Maintained ester yields above 80% at substrate concentrations up to 0.8M.
• Showcased extensive chain length selectivity, with yields >98% for C3-C8 acids and >95% for C1-C6 alcohols.

Conclusions:

• T. fusca cutinase is a highly effective biocatalyst for short-chain ester synthesis.
• The enzyme's robustness and selectivity support its potential for industrial-scale production of food flavorings.