Engineered phytic acid-lignin networks: one-pot strategy toward stable, multifunctional bio-based materials

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Lignin, a complex polymer from biomass, is an underutilized resource.
• Developing functional materials from lignin is crucial for sustainable chemistry.
• Phytic acid offers antioxidant and flame-retardant properties but requires effective integration into matrices.

Purpose of the Study:

• To develop a one-pot method for covalently incorporating phytic acid into lignin.
• To create stable lignin-phytic acid nanoparticles (P-LNPs) with enhanced properties.
• To explore the potential applications of these novel P-LNPs.

Main Methods:

• A one-pot synthesis using diepoxy reagent and ethyl levulinate as crosslinkers.
• Confirmation of covalent bonding using lignin model compounds.
• Nanoparticle formation via solvent shifting.
• Characterization of P-LNPs for size, surface charge, and pollutant adsorption.

Main Results:

• Successful covalent linkage of phytic acid into the lignin network.
• Phytic acid-modified lignin demonstrated self-extinguishing behavior and retained antioxidant activity.
• Stable P-LNPs (140 nm average size) with high surface charge (-64.5 mV at pH 7) were formed.
• P-LNPs showed efficient cationic pollutant adsorption (62.9 mg/g) and antifogging properties.

Conclusions:

• A stable and scalable lignin-phytic acid system was successfully developed.
• P-LNPs offer a versatile platform material for diverse applications.
• This approach transforms lignin into a high-value, functional biomaterial.