First, an oil-in-water emulsion was formed (IKA Labor Pilot), with the fungicide (tebuconazole or resveratrol) dissolved in ethyl acetate (7.5 g/L) as organic phase, whereas the aqueous phase, saturated with ethyl acetate, contained the different matrixes used (15 g/L): β-glucans, soybean lecithin or a mixture of both of them (50% in weight). Both liquid phases were mixed in a ratio 1:9 at 750 rpm for 5 min and then the resulted emulsion was fed into a rotor–stator machine (IKA® LABOR PILOT 2000/4), with 200 mL capacity, and processed at 4200 rpm for 4 min. These operating conditions were selected based on some previous works (Varona et al., 2009), where it was found a reduction in droplet size with increasing surfactant concentration, homogenization velocity and time. Afterwards, the organic solvent was removed by vacuum evaporation (Heidolph) at 60 °C, 75 rpm and a vacuum of 0.08 MPa, and finally the suspensions were dried either by SD or by PGSS-drying.
By SD (Gea Niro Mobile Minor), the suspension (1 L/h) was introduced into the drying chamber through a rotary atomizer (compressed air at 0.6 MPa). Droplets were formed and water was removed from them by a stream of hot air (130 °C at the inlet and 85 °C at the outlet). The dry particles were recovered in a cyclone.
First, an oil-in-water emulsion was formed (IKA Labor Pilot), with the fungicide (tebuconazole or resveratrol) dissolved in ethyl acetate (7.5 g/L) as organic phase, whereas the aqueous phase, saturated with ethyl acetate, contained the different matrixes used (15 g/L): β-glucans, soybean lecithin or a mixture of both of them (50% in weight). Both liquid phases were mixed in a ratio 1:9 at 750 rpm for 5 min and then the resulted emulsion was fed into a rotor–stator machine (IKA® LABOR PILOT 2000/4), with 200 mL capacity, and processed at 4200 rpm for 4 min. These operating conditions were selected based on some previous works (Varona et al., 2009), where it was found a reduction in droplet size with increasing surfactant concentration, homogenization velocity and time. Afterwards, the organic solvent was removed by vacuum evaporation (Heidolph) at 60 °C, 75 rpm and a vacuum of 0.08 MPa, and finally the suspensions were dried either by SD or by PGSS-drying.By SD (Gea Niro Mobile Minor), the suspension (1 L/h) was introduced into the drying chamber through a rotary atomizer (compressed air at 0.6 MPa). Droplets were formed and water was removed from them by a stream of hot air (130 °C at the inlet and 85 °C at the outlet). The dry particles were recovered in a cyclone.
การแปล กรุณารอสักครู่..
