Strategies toward Renewable and Compostable Intravenous Bag Materials

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Sustainable Plastics

Background:

• The medical industry generates substantial single-use plastic waste, particularly from items like IV bags.
• Poly(vinyl chloride) (PVC) is the standard for IV bags but raises environmental and health concerns due to its non-renewable origin and potential phthalate plasticizers.

Purpose of the Study:

• To evaluate renewable, compostable poly(γ-methyl-ε-caprolactone) (PγMCL)-based thermoplastic elastomers as alternatives for IV bag materials.
• To assess the mechanical, biochemical, and biocompatibility profiles of these novel materials compared to PVC.

Main Methods:

• Synthesis of thermoplastic poly(urethane-urea) (TPUU) and a 4-arm PγMCL-based star-block polymer ((ML)₄) on a large scale (>55 g).
• Comprehensive evaluation of mechanical properties, cytocompatibility (in vitro), and tissue response (in vivo rat model).
• Assessment of chemical hazard thresholds according to ISO standards.

Main Results:

• TPUU demonstrated mechanical properties comparable to PVC.
• Both PγMCL-based materials exhibited superior cytocompatibility compared to PVC.
• In vivo studies showed no significant adverse histopathology from direct tissue contact with TPUU or (ML)₄.
• PγMCL-based materials met ISO chemical hazard thresholds, similar to PVC.

Conclusions:

• Renewable, compostable PγMCL-based polymers are viable alternatives to PVC for IV bags.
• These materials offer improved biocompatibility and comparable mechanical performance.
• This research provides a framework for developing circular polymers in the biomedical sector and reducing plastic waste.