Green Fabrication Approaches of Lignin Nanoparticles from Different Technical Lignins: A Comparison Study

• DOI: 10.1002/cssc.202101356
• Publication Date: 2021-08-16T13:38:25Z
• Authors: Patrícia Figueiredo; Maarit H. Lahtinen; Melissa B. Agustin; Danila Morais de ...; Sami‐Pekka Hirvonen; Paavo A. Penttilä; Kirsi S. Mikkonen
• Keywords: Dispersity; Softwood; Depolymerization

The production of lignin nanoparticles (LNPs) has emerged as a way to overcome the highly variable and complex molecular structure lignin. It can offer morphological control polymer, allowing formation stable LNP dispersions in aqueous media, while increasing potential for high-value applications. However, polydispersity morphology LNPs varies depending on grade preparation method, systematic comparison using different technical lignins is lacking. In this study, it was attempted find green fabrication method with distinct solvent fractionation prepare three starting polymers: BLN birch (hardwood, BB), alkali Protobind 1000 (grass, PB), kraft LignoBoost (softwood, LB). For that, anti-solvent precipitation approaches were systematically compared: 70 % ethanol, acetone/water (3 : 1) NaOH solvent, water/aqueous HCl anti-solvent. Among all these methods, approach allowed homogeneous monodisperse negative surface charge also spherical smooth surfaces. Overall, results revealed that most effective tested obtain homogenous, small, from lignins. These exhibited an improved stability at ionic strengths wider pH range compared other which greatly increase their application many fields, such pharmaceutical food sciences.