Antioxidant Network Based on Sulfonated Polyhydroxyalkanoate and Tannic Acid Derivative.

Area of Science:

• Polymer Chemistry
• Biomaterials Science

Background:

• Poly(3-hydroxyalkanoates) (PHAs) are biodegradable polymers with potential in biomaterial applications.
• Developing novel PHA-based materials with enhanced properties and functionalities is an active area of research.

Purpose of the Study:

• To develop novel gels based on medium chain length poly(3-hydroxyalkanoates) (mcl-PHAs) utilizing ionic interactions.
• To investigate the effect of different cations on the formation and mechanical properties of these PHA-based gels.
• To evaluate the stability and potential bioactivity of the developed PHA gels.

Main Methods:

• Synthesis of water-soluble mcl-PHAs with sulfonate groups via thiol-ene reaction.
• Physical crosslinking of anionic mcl-PHAs using divalent inorganic cations (Ca2+, Ba2+, Mg2+) and modified gallic acid (GA-N(CH3)3+) or tannic acid (TA-N(CH3)3+).
• Characterization of gel formation, mechanical properties (elastic modulus), and stability.

Main Results:

• Successful formation of ionic crosslinked mcl-PHA gels was achieved.
• The nature of the cation significantly influenced gel formation and mechanical properties, with TA-N(CH3)3+ yielding gels with a high elastic modulus (around 4200 Pa).
• The PHOSO3-/TA-N(CH3)3+ gels exhibited antioxidant activity and remained stable for over 5 months.

Conclusions:

• Novel, stable, and antioxidant PHA-based gels can be successfully developed through ionic crosslinking.
• The choice of crosslinking agent is critical for tailoring the properties of these biomaterials.
• These findings support the potential of these novel PHA gels for applications in active biomaterials.