Cyclodextrin production by cyclodextrin glycosyltransferase from Bacillus circulans DF 9R

Area of Science:

• Biotechnology
• Enzyme Technology
• Carbohydrate Chemistry

Background:

• Cyclodextrins (CDs) are versatile cyclic oligosaccharides with broad industrial applications.
• Efficient and cost-effective CD production is crucial for various sectors, including food, pharmaceuticals, and agriculture.

Purpose of the Study:

• To optimize the production of cyclodextrins (CDs) using cyclodextrin glycosyltransferase (CGTase) from Bacillus circulans DF 9R.
• To develop a streamlined method for enzyme purification, concentration, and subsequent CD production using cassava starch.

Main Methods:

• Experimental designs were employed to optimize CD production conditions.
• A novel method involved partial purification and concentration of CGTase, using cassava starch as both an enzyme adsorbent and substrate.
• Starch liquefaction was achieved via heat-treatment (70°C for 15 min) without enzyme inactivation.

Main Results:

• Optimal CD production conditions were identified: 5% (w/v) cassava starch, 15 U CGTase/g substrate, 56°C, and pH 6.4.
• The optimized process resulted in 66% (w/w) starch conversion to CDs within 4 hours.
• The weight ratio of alpha-CD:beta-CD:gamma-CD produced was 1.00:0.70:0.16.

Conclusions:

• The developed method efficiently produces cyclodextrins using Bacillus circulans CGTase and cassava starch.
• The optimized conditions and integrated process offer a cost-effective approach for industrial-scale CD manufacturing.
• The high conversion rate and specific CD ratio demonstrate the method's potential for diverse applications.