In this research, spray drying was used to produce malt extract powder. The effect of two parameters including
inlet air temperature (at levels 160, 170, 180°C) and maltodextrin concentration (at levels 0, 10, 20, 30%) was investigated
on malt extract powder properties including particle size, theoretical specific surface area, particle size distribution and
span value, scorched particles and solubility index, vitamin B2 content, glass transition and sticky point temperature. Results
indicated that spray drying method produced a malt extract powder with high quality. The drying efficiency depended
on inlet air temperature and maltodextrin concentration. Increasing inlet air temperature and maltodextrin concentration
enhanced the drying performance. The highest quality factors for the powdered malt extract were obtained at
170°C and 20% maltodextrin, which included disk B for scorched particles, solubility amount=0.05 ml, average particle
size= 22 microns, vitamin B2 content=1.56mg/100g.
Inlet air temperature, Maltodextrin, Malt extract, Spray drying, Vitamin B2.
Department of Food Science & Technology, Quchan Branch, Islamic Azad University, Quchan, Iran.