The aim of this study was to investigate the effect of some process variables on the physico-chemical properties of amorphous inulin.In this context, a three-factor second-order response-surface model was fitted to five variables.The factors were feed concentration and temperature and inlet air temperature while the five variables were bulk and tapped density, particles size, moisture content and the glass transition temperature.In the feed concentration (10-40%, w/w), feed temperature (40-90°C) and inlet air temperature (120-230°C) range tested, statistical analysis revealed that physico-chemical properties of inulin were mainly governed by inlet air temperature and the feed concentration to a lesser extent.The feed temperature was secondary in comparison with the two first factors.In regards to the production parameters, a qualitative microscopic study allowed to visualize the morphological property changes and to correlate them to the physicochemical properties.
In this study, we study the effect of different laser wavelengths in raw milk sterilization.The milk treatment sample with LD laser (650, 810 and 1064 nm) was investigated.The microbial inactivation of different microorganism was achieved with laser source power 70 mW at hold time 1.5 min for all laser wavelengths, the study showed that the maximum microbial reduction (100%) was obtained at 650 nm for the same operating conditions.There was no significant variation in physical chemical properties of treatment sample in comparing with control milk sample.
