Supercritical CO2 iof LDPE films with terpene ketones as biopesticides against corn weevil (Sitophilus zeamais)

GOÑI, MARÍA L.; GAÑÁN, NICOLÁS A.; HERRERA, JIMENA M.; STRUMIA, MIRIAM C.; ANDREATTA, ALFONSINA E.; MARTINI, RAQUEL E.

JOURNAL OF SUPERCRITICAL FLUIDS

ELSEVIER SCIENCE BV

Año: 2017 vol. 122 p. 18 - 18

0896-8446

n this work, the supercritical carbon dioxide impregnation of low density polyethylene (LDPE) films with a mixture of two terpenic ketones (thymoquinone and R-(+)-pulegone) with biopesticide activity is investigated, as a strategy for developing a packaging material or delivery device for protecting seeds, kernels and derivatives during storage and transport. Impregnation runs were performed according to a fractional factorial experimental design in order to evaluate the effect of four process variables at two levels (pressure: 10?15 MPa; depressurization rate: 0.5?2.0 MPa/min; time: 2?4 h; initial ketone mole fraction: 0.0017?0.0025) on impregnation yield and selectivity between ketones. Operational temperature was constant for all experiments and equal to 45 °C. The impregnated films were analyzed by infrared spectroscpy (FTIR) in order to confirm the presence of both ketones and determine their relative ratio in the final product. ANOVA test of the results indicate that contact tim