Can poly(butylene succinate) degrade in seawater?

Area of Science:

• Polymer Science
• Environmental Science
• Microbiology

Background:

• Poly(butylene succinate) (PBSu) is a biodegradable polymer with potential applications in natural environments.
• Its biodegradability in marine settings remains uncertain and is influenced by factors like molecular weight.

Purpose of the Study:

• To investigate the impact of Poly(butylene succinate) molecular weight on its marine biodegradability.
• To analyze changes in microbial communities during PBSu degradation in seawater.

Main Methods:

• Preparation of PBSu samples with varying molecular weights using size-exclusion chromatography (SEC).
• Biodegradation assessment via biochemical oxygen demand (BOD) testing in seawater.
• Analysis of residual PBSu molecular weight changes using SEC.
• Evaluation of microbial flora shifts using amplicon sequencing.

Main Results:

• Low-molecular-weight (LMW)-PBSu demonstrated higher biodegradability in seawater.
• High-molecular-weight PBSu underwent slower enzymatic hydrolysis.
• The presence of PBSu altered the microbial flora composition in the seawater cultures.
• Adaptation of microbial communities was observed over extended degradation periods.

Conclusions:

• PBSu's marine biodegradability is significantly influenced by its molecular weight.
• LMW-PBSu offers a more rapid degradation pathway in marine environments.
• PBSu can be considered a potentially biodegradable material in marine ecosystems, particularly at lower molecular weights or over extended degradation times, with microbial adaptation playing a role.