Solvent-free geranyl oleate production by enzymatic esterification

Area of Science:

• Biocatalysis and Green Chemistry
• Organic Synthesis
• Enzyme Technology

Background:

• Chemical synthesis of geranyl propionate often involves harsh conditions and drawbacks.
• Enzymatic esterification offers a sustainable alternative for producing valuable esters.
• Lipase-catalyzed reactions are increasingly explored for green chemical production.

Purpose of the Study:

• To optimize the enzymatic production of geranyl propionate from geraniol and propionic acid.
• To investigate the kinetics and optimal conditions for this solvent-free esterification process.
• To demonstrate the potential of biocatalysis in overcoming limitations of traditional chemical routes.

Main Methods:

• Sequential experimental design strategy to optimize reaction parameters.
• Enzymatic esterification using a commercial lipase in a solvent-free system.
• Kinetic study to evaluate the influence of substrate molar ratio, enzyme concentration, and temperature.

Main Results:

• Optimized conditions: 40°C, 3:1 geraniol to propionic acid molar ratio, 150 rpm, and 10 wt% enzyme, yielding ~93% conversion.
• Kinetic study revealed near-complete conversion in 30 min with a 1:6 acid to alcohol molar ratio, 5 wt% enzyme, and 40°C.
• Demonstrated efficient geranyl propionate synthesis via biocatalysis.

Conclusions:

• Enzymatic esterification provides an efficient and optimized route for geranyl propionate production.
• Solvent-free conditions and optimized parameters significantly enhance reaction conversion and yield.
• This biocatalytic approach presents a promising, environmentally friendly alternative to chemical synthesis.