Developing an ecofriendly UCST-type enzymatic cascade system for efficient and cost-effective starch solid wastes...

Area of Science:

• Biocatalysis and enzyme engineering
• Biotechnology for waste valorization
• Polymer science in bioprocessing

Background:

• Enzymatic hydrolysis of starch solid wastes offers a sustainable solution but is often limited by high operational costs.
• Traditional enzyme immobilization methods face challenges with low mass transfer rates, impacting efficiency.
• Developing cost-effective and efficient enzymatic strategies is crucial for starch waste valorization.

Purpose of the Study:

• To develop a novel enzymatic modification strategy for efficient starch solid waste hydrolysis.
• To create enzymes with upper critical solution temperature (UCST) properties for improved recovery and reuse.
• To reduce the cost associated with enzymatic starch waste treatment.

Main Methods:

• Preparation of a novel polymer system using poly(methacrylic acid), polyacrylic acid, and gelatin.
• Modification of alpha-amylase and glucoamylase with the prepared polymer system to impart UCST characteristics.
• Hydrolysis of starch solid wastes using the modified enzymes above UCST and recovery below UCST.

Main Results:

• Efficient hydrolysis of starch solid wastes was achieved using the modified co-enzymes above UCST.
• The modified enzymes exhibited facile recovery and separation below UCST, significantly reducing treatment costs.
• The proposed enzymatic modification strategy demonstrated excellent environmental-friendly and bio-safe properties.

Conclusions:

• Enzymatic modification offers a viable alternative to traditional immobilization for starch waste treatment.
• The UCST-based enzyme system facilitates efficient hydrolysis and simplifies enzyme recovery, leading to cost reduction.
• This approach provides a foundation for sustainable and economical enzymatic conversion of starch solid wastes.