Abstract:

The effect of different particle sizes of polyethylene terephthalate (PET) as substrate on the growth of strain was measured by monitoring concentration changes of strains，products and variety of crystallinity. Another purpose is to explore the role of the substrate size structure in product formation and used by cells. The results showed that when the smaller PET powder as a substrate, the growth rate and biomass of strains were much greater than when the substrate has a larger size. During the culture process, the composition of products detected in the fermentation liquid varied with the size. And the smaller particles are more easily degraded, which occurred mainly in the amorphous region.

Key words: biocatalysis, polyethylenc terephthalate, size, bioreactive