Maltodextrin hydrolysis in a fluidized-bed immobilized enzyme reactor

Area of Science:

• Biocatalysis and enzyme immobilization
• Chemical reaction engineering
• Biomass utilization

Background:

• Maltodextrin hydrolysis is crucial for producing glucose syrups.
• Enzyme immobilization enhances enzyme stability and reusability.
• Corn stover is an abundant and sustainable lignocellulosic biomass source.

Purpose of the Study:

• To immobilize glucoamylase onto corn stover for maltodextrin hydrolysis.
• To investigate the kinetics of the immobilized enzyme in a fluidized bed reactor.
• To develop a mathematical model for the hydrolysis process.

Main Methods:

• Covalent grafting of glucoamylase onto corn stover particles.
• Enzyme activity assays using varying support particle sizes (0.8 mm and 0.2 mm).
• Kinetic studies in a differential reactor to assess mass transfer effects.
• Development and validation of a mathematical model for enzyme kinetics.

Main Results:

• Immobilized glucoamylase achieved high activity (up to 1700 U/g) on corn stover.
• Smaller particle sizes (0.2 mm) exhibited higher enzyme activity.
• Mass transfer resistance significantly influenced the reaction rate.
• The developed mathematical model accurately described experimental conversion data.

Conclusions:

• Corn stover is an effective support for glucoamylase immobilization.
• Fluidized bed reactors are suitable for this immobilized enzyme system.
• Understanding mass transfer is critical for optimizing biocatalytic processes.
• The mathematical model provides a valuable tool for process design and scale-up.