2026-04-26T22:08:00Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/512922025-02-06T10:53:44Zcom_10324_1166com_10324_931com_10324_894col_10324_1338

2022-01-12T17:05:10Z urn:hdl:10324/51292 Chitosan-Based Coatings to Prevent the Decay of Populus spp. Wood Caused by Trametes Versicolor Silva Castro, Iosody Casado Sanz, María Milagrosa León Alonso-Cortés, Agustín Martín Ramos, Pablo Martín Gil, Jesús Acuña Rello, Luis Chitosan and chitosan oligomers are receiving increasing attention due to their antimicrobial properties. In the present study, they were assayed as a preventive treatment against white-rot decay of Populus wood (very important in economic and environmental terms), caused by Trametes versicolor fungus. Their capacity to incorporate different chemical species into the polymer structure with a view to improving their anti-fungal activity was also assessed by mixing oligo-chitosan with propolis and silver nanoparticles. The minimum inhibitory concentration of medium-molecular weight chitosan (MMWC), chitosan oligomers (CO), propolis (P), nanosilver (nAg), and their binary and ternary composites against T. versicolor was determined in vitro. Although all products exhibited anti-fungal properties, composites showed an enhanced effect as compared to the individual products: 100% mycelial growth inhibition was attained for concentrations of 2.0 and 0.2 mg mL􀀀1 for the CO-P binary mixture, respectively; and 2 g mL􀀀1 for nAg in the ternary mixture. Subsequently, MMWC, CO, CO-P and CO-P-nAg composites were tested on poplar wood blocks as surface protectors. Wood decay caused by the fungus was monitored by microscopy and vibrational spectroscopy, evidencing the limitations of the CO-based coatings in comparison with MMWC, which has a higher viscosity and better adhesion properties. The usage of MMWC holds promise for poplar wood protection, with potential industrial applications. 2022-01-12T17:05:10Z 2022-01-12T17:05:10Z 2018 info:eu-repo/semantics/article Coatings, 2018, vol. 8, n. 12, 415 2079-6412 https://uvadoc.uva.es/handle/10324/51292 10.3390/coatings8120415 415 12 Coatings 8 2079-6412 eng https://www.mdpi.com/2079-6412/8/12/415 info:eu-repo/semantics/openAccess © 2018 MDPI MDPI