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<p>This study aimed to evaluate the potential of biodegradable seed coatings made from chitosan and Kraft lignin nanoparticles (KLN) to enhance soybean seed germination and seedling development. The research focused on developing sustainable applications for Kraft lignin, a byproduct of the pulp and paper industry in Brazil.&#xa0;KLN were synthesized via solvent exchange and exhibited high colloidal stability (zeta potential of − 36.43 mV) and spherical morphology. Seven formulations combining chitosan with different KLN concentrations were prepared to produce seed coating films. Two soybean cultivars, Voraz and M7739, were coated with these films and evaluated for germination rate, root length, and fresh biomass accumulation under controlled conditions. To reinforce the structural characterization, FTIR analysis was performed on the materials used.&#xa0;KLN–chitosan coatings positively influenced germination and early growth in soybean seeds. In the Voraz cultivar, 0.5Q1.25KLN increased root length by 135% and total seedling length by 80% compared to the control. In M7739, responses were more limited but still expressive, with increases of up to 191% in primary root length and 1,286% in secondary root length under specific treatments.&#xa0;KLN–chitosan composite films are promising as biodegradable, bio-stimulant seed coatings. They improved soybean germination performance and early seedling vigor while offering an environmentally sustainable alternative for Kraft lignin valorization. These findings highlight the potential of lignin nanoparticles in agricultural applications, contributing to circular economy strategies in the agro-industrial sector.</p>

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Enhancing Soybean Germination with Chitosan Films Containing Kraft Lignin Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Cecilia Baldoino Ferreira,
  • Carlos Henrique Milagres Ribeiro,
  • Paulo Henrique Frois Correa Barros,
  • Renata Vacaro Moura Alves,
  • Heloisa Oliveira dos Santos,
  • Maria Lucia Bianchi

摘要

This study aimed to evaluate the potential of biodegradable seed coatings made from chitosan and Kraft lignin nanoparticles (KLN) to enhance soybean seed germination and seedling development. The research focused on developing sustainable applications for Kraft lignin, a byproduct of the pulp and paper industry in Brazil. KLN were synthesized via solvent exchange and exhibited high colloidal stability (zeta potential of − 36.43 mV) and spherical morphology. Seven formulations combining chitosan with different KLN concentrations were prepared to produce seed coating films. Two soybean cultivars, Voraz and M7739, were coated with these films and evaluated for germination rate, root length, and fresh biomass accumulation under controlled conditions. To reinforce the structural characterization, FTIR analysis was performed on the materials used. KLN–chitosan coatings positively influenced germination and early growth in soybean seeds. In the Voraz cultivar, 0.5Q1.25KLN increased root length by 135% and total seedling length by 80% compared to the control. In M7739, responses were more limited but still expressive, with increases of up to 191% in primary root length and 1,286% in secondary root length under specific treatments. KLN–chitosan composite films are promising as biodegradable, bio-stimulant seed coatings. They improved soybean germination performance and early seedling vigor while offering an environmentally sustainable alternative for Kraft lignin valorization. These findings highlight the potential of lignin nanoparticles in agricultural applications, contributing to circular economy strategies in the agro-industrial sector.