(694d) Novel Double-Shell Lignin Nanocapsules Are a Stable Vehicle for Fungicide Encapsulation and Release
AIChE Annual Meeting
2020
2020 Virtual AIChE Annual Meeting
Forest and Plant Bioproducts Division
Sustainable Materials from Lignocellulosic Resources for Industrial Applications
Friday, November 20, 2020 - 8:45am to 9:00am
This paper describes the fabrication and characterization of a newly developed lignin nanocapsule, its performance towards encapsulating a fungicide, and effectiveness at controlling its release. Lignin nanoparticles are biologically and environmentally compatible, the amphiphilic properties of lignin, adsorption capacity, as well as its natural cross-linking tendency make it suitable for use as a vessel for stable cargo delivery. Here we report a sustainable approach for producing hollow, double-shell capsules from hardwood kraft lignin. The recovered lignin was dissolved without further modification in tetrahydrofuran and inserted dropwise into a water/ethanol solution containing sacrificial surfactant templates. Monodispersed, hollow, double-shell lignin capsules were produced via a two-step self-assembly. The water/ethanol solution acted as a non-solvent while simultaneously providing strategic sites for controlled-size production. The internal shells of the nanoparticles were cross-linked with biodegradable maleic anhydride to bolster the structural stability. The average hydrodynamic diameter of the particles was 202.2 ±66 nm, and these were stable in water for a period of four months. Following synthesis, the nanoparticles were loaded with propiconazole at a drug loading of 16%. This system could represent an effective wood preservative.
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