Abstract
The aim of this work was to study the influence of inlet air temperature and maltodextrin concentration on functional properties, microstructure and heat utilization efficiency of sweet orange juice powder by spray drying. The inlet air temperature of 130, 140 and 150°C and maltodextrin concentration of 6 per cent, 9 per cent and 12 per cent were chosen as independent variables to produce the spray dried sweet orange juice powder. The mean value of functional properties of spray dried sweet orange juice powder viz., flowability, cohesiveness, ascorbic acid and radical scavenging activity were 21.42-16.00, 1.19-1.25, 74.20-68.88 mg.100g -1 and 21.54-23.19 mg.g -1 , respectively, which were significantly affected (p<0.05) by inlet air temperature and maltodextrin concentration. SEM analysis shown that surface was smooth with irregular shaped particles with complex link bridge. The heat utilization efficiency was done using MATLAB software. The maximum heat utilization efficiency (50.43%) of spray dryer was obtained at inlet air temperature of 130°C with 9 per cent maltodextrin concentration.
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