4.7 Article

An eco-friendly strategy for preparing lignin nanoparticles by self-assembly: Characterization, stability, bioactivity, and Pickering emulsion

期刊

INDUSTRIAL CROPS AND PRODUCTS
卷 188, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.indcrop.2022.115651

关键词

Bioactivity; Deep eutectic solvent; Lignin; Nanoparticle; Pickering emulsions

资金

  1. earmarked fund for Jiangsu Agricultural Industry Technology System [JATS [2022] 507]
  2. Fundamental Research Funds for the Central Universities [1022050205214970]

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This study presents a green and simple method to produce spherical lignin nanoparticles (LNPs) using betaine:lactic acid deep eutectic solvent (DES) and water. The LNPs exhibited improved thermal stability, enhanced antioxidant activity, and lower minimum inhibitory concentration against Staphylococcus aureus. Additionally, they showed potential as a stabilizer in Pickering emulsions. The study lays a critical foundation for expanding the further utilization of lignin.
Spherical lignin nanoparticles (LNPs) offer more possibilities for high value-added use of lignin, but un-Cecofriendly organic solvents used for preparing LNPs must be addressed. This study reported a green and simple method to produce LNPs using a betaine:lactic acid deep eutectic solvent (DES) via self-assembly induced by dropping water. The critical water content (41 vol%) at the beginning of self-assembly was determined by dynamic light scattering. The well-defined spherical colloid particles with an average size of 57.16 +/- 1.43 nm were obtained after adding 80 vol% water content, followed by verifying the morphologies via scanning electron microscopy and transmission electron microscopy. A better water dispersibility of colloid particles was elucidated by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The stable LNPs were optimized at 5 mg/mL of initial lignin concentration, 1 mL/min of dropping speed, and 80 vol% water content. Compared with lignin, LNPs exhibited improved thermal stability, enhanced antioxidant activity, and lower minimum inhibitory concentration against Staphylococcus aureus (4.0 mg/mL). Further, 7.5 mg/mL of LNPs concentration demonstrated its potentiality as a stabilizer in Pickering emulsions. Furthermore, the produced LNPs displayed high potential in bio-based materials and emulsion, providing a critical foundation for broadening the further utilization of lignin.

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