Microencapsulation of Schinus molle essential oil by spray-drying and insecticidal activity on Haematobia irritans.

LOPEZ ANDRES; CASTRO SILVINA; ANDINA M; URES X; MUNGUIA B; LLABOT J; ERELDER H; DELLACASA E; PALMA S. D; DOMÍNGUEZ L.

Industrial Crops and Products

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2014 vol. 53 p. 209 - 216

0926-6690

Microencapsulation of the Schinus molle Rev L. (Anacardiaceae) leaves essential oil (EO) has been employed for controlling release of active ingredients, protecting them from the external environment, with a concomitant improving of its potential insecticidal on Haematobia irritans. Four microcapsule formulations (EEO1 to EEO4) of S. molle EO were prepared by spray-dying, using a mini spray dryer and gum Arabic/maltodextrin (AG/MDX) as carrier in different proportions, at a ratio of 4:1 (MDX/AG: EO). Encapsulation efficiency (EE: 96-100 %), powder morphology and particle size distribution were analyzed as process control. An interesting correlation was demonstrated between EO free and microcapsules (EEO), in the preliminary and comparative studies of stability (at 45ºC) and insecticide activity on Haematobia irritans. In fact, a very slow liberation profile of the microencapsulated EO (EEO4) was observed over a period of 366 h (71 % percentage of EO retention) and a slower time dependent insecticide effect (32 and 73 % of dead flies at 2 and 4 h of exposure time) compared to the free EO (96% of dead flies at 2h).