Physics-based prediction of biopolymer degradation

Area of Science:

• Biogeochemistry
• Microbial Ecology
• Polymer Science

Background:

• Insoluble biomatter is a primary carbon source for bacteria, crucial for the global carbon cycle.
• Predicting biomatter degradation is vital for understanding environmental adaptations.

Purpose of the Study:

• To elucidate and quantify the macro-scale phenomenon of biomatter degradation using micro-scale experiments.
• To develop a theoretical model for bio-chemo-mechanically coupled polymer degradation kinetics.

Main Methods:

• Micro-scale experiments on isolated biopolymer particle degradation.
• Development of a theoretical model incorporating microbial production, material dissociation, penetration, and chemo-mechanically coupled swelling.
• Validation of the model against experimental data.

Main Results:

• Observed highly nonlinear degradation kinetics, not explained by conventional scaling.
• The model quantitatively captures experimental results.
• Distinct bacterial signatures were identified, independent of experimental conditions.

Conclusions:

• The coupled physical and biochemical processes are essential for understanding polymer degradation.
• The developed model accurately predicts degradation kinetics and bacterial behavior.
• Model predictions extend to scales inaccessible in laboratory settings.