Valorization of marine resources from Mar Argentino aiming developments in nanotechnology

VERA ALVAREZ

Sorocaba

Workshop; III Workshop de Nanotecnologia Ambiental; 2018

Shrimp fishing industry wastes are still a main problem with high environmental impact worldwide. In this study, chitosan (CS) with ultra-high molecular weight and deacetylation degree ≥85% was obtained from shrimp fishing industry waste from Argentinean Patagonia1. In agriculture, the use of toxic pesticides to control plant diseases is a common practice which causes hazards to the human health and environment. Despite the valuable contribution of new pesticides to control plant diseases, smart and sustainable options to develop a bioplaguicide as an alternative to agro-chemicals still remains as a challenge in phytopathology. The plant defenses can be constitutive or induced and exogenous administration of different phytohormones, are reported to induce plant defenses triggering local and systemic plant responses. In this sense, salicylic acid (SA) is a phytohormone known to play major role in several physiological processes including the regulation of plant defense response against various pathogens. CS based microparticles capable to entrapped SA, a phytohormone known to play major role in the regulation of plant defense response against various pathogens, were prepared using tripolyphosphate (TPP) as crosslinker. Unloaded microparticles and microparticles loading different salicylic acid amount were fully characterized in terms of size, shape, LE% (load efficiency) and FTIR (Fourier Transform Infrared Spectroscopy), TGA (Thermogavimetric Analysis), DSC (Difefrential Scanning Calorimetry) and in vitro salicylic acid release tests2.3.Chitosan based microparticles were non-toxic in the most doses applied in lettuce seedlings. Instead, microparticles can positively modulate the plant growth and have the potential to improve plant defense responses. In particular salicylic acid loaded microparticles effect was very promising for its application as activators of salicylic acid dependent plant defense responses in crop species2,3