Cellulose biosynthesis using simple sugars available in residual cacao mucilage exudate

Area of Science:

• Biotechnology
• Materials Science
• Sustainable Chemistry

Background:

• Cacao fruit biomass utilization is low, with mucilage typically discarded.
• Cacao mucilage exudate (CME) is nutrient-rich and underutilized.
• Bacterial cellulose (BC) production offers a sustainable biopolymer alternative.

Purpose of the Study:

• To evaluate CME as a substrate for bacterial cellulose (BC) production.
• To optimize BC yields from CME using Gluconacetobacter xylinus.
• To assess the scalability of BC production from CME.

Main Methods:

• Cultivation of Gluconacetobacter xylinus in both Hestrin and Schramm medium and CME.
• Optimization of CME by dilution and addition of nitrogen sources.
• Scale-up of BC production from laboratory to pilot scale.

Main Results:

• CME can support BC production, but initial yields were low (0.55 g L⁻¹).
• Optimized CME (diluted, with nitrogen) increased BC yield to 13.13 g L⁻¹.
• Production rates and yields remained consistent during scale-up from 30 mL to 15 L.

Conclusions:

• Optimized CME is a viable and cost-effective substrate for BC production.
• The BC production process using CME demonstrates robustness and industrial scalability.
• This approach enhances cacao byproduct valorization and promotes sustainable biopolymer manufacturing.