Active LDPE films loaded with biopesticides by supercritical CO2-assisted impregnation for stored grain protection

HERRERA, JIMENA M.; GAÑÁN, NICOLÁS A.; GOÑI, MARÍA L.; ZYGADLO, JULIO A.; MARTINI, RAQUEL E.

FOOD PACKAGING AND SHELF LIFE

ELSEVIER

Lugar: Freising; Año: 2018 vol. 18 p. 80 - 86

2214-2894

The aim of this contribution was to obtain bioactive materials for stored grain protection and food preservation, by incorporating a biopesticide (1-octen-3-ol) in polyethylene (LDPE) films using supercritical CO2-assisted impregnation. The influence of different pressures and depressurization rates on the amount of 1-octen-3-ol that can be impregnated was investigated. Results revealed that the best impregnation yield of biopesticide in films (Y = 3.39 ± 0.27 %) is associated with low depressurization rate (0.5 MPa·min-1) and mild pressure conditions (~9 MPa). The release kinetics of 1-octen-3-ol from the impregnated films was also investigated. In addition, the biocidal activity of impregnated films obtained under the influence of the best operational conditions was tested towards the main pests of stored grains. Films showed insecticidal activity against Sitophilus zeamais (100% mortality after 24h) and also produced a decrease of the fungal growth rate of Fusarium verticillioides (55% of inhibition).