PREPARATION AND CHARACTERIZATION 1 OF LIGNIN MICROPARTICLES-IN- ALGINATE BEADS FOR ATRAZINE CONTROLLED RELEASE

BUSATTO, CARLOS ALBERTO; TAVERNA, MARÍA EUGENIA; LESCANO, MAIA RAQUEL; ZALAZAR, CRISTINA SUSANA; ESTENOZ, DIANA ALEJANDRA

JOURNAL OF POLYMERS AND THE ENVIRONMENT

SPRINGER/PLENUM PUBLISHERS

Año: 2019 vol. 27 p. 2831 - 2841

1566-2543

The use of lignin as polymeric matrices for controlled release systems in agriculture isa promising alternative for its revalorization. In this work, different atrazine deliverysystems were studied. Lignin derived from ionic isolation was used for the preparationof atrazine-loaded microparticles by the solvent extraction/evaporation and microfluidictechniques. Microparticles were also encapsulated in sodium alginate beads. Ligninmicroparticles prepared by microfluidics presented a larger particle size, higherencapsulation efficiency and a narrow size distribution. The in vitro release of atrazinewas evaluated in water. Atrazine release from microparticles prepared by the solventextraction/evaporation technique showed a significant burst release, and this effectwas reduced by incorporating microparticles within alginate beads. In addition, thephytotoxicity of the systems was evaluated employing Lactuca sativa seeds. Thephytotoxicity results showed that lignin-based formulations are safe according to theparameters evaluated, in contrast with commercial atrazine that resulted phytotoxic.