Optimization of carriers (maltodextrin, arabic gum) for spray-drying of Pouzolzia zeylanica extracts using response surface methodology

Abstract

Spray drying technology was applied widely in pharmaceutics and food. In spray drying process of Pouzolzia zeylanica extract, except factors as inlet air tenperature, feed flow rate, the additional carrier types and concentration was also significant effect on the physicochemical properties of of final product. The Response Surface Methodology (RSM) with central composite design (CCD) was applied to optimize maltodextrin (5÷-15%) and xanthan gum rate (0.06÷-1.0%) during spray drying of Pouzolzia zeylanica extract. The physicochemical characteristics of spray dried powder (bioactive compounds,moisture content as well as particle size distribution) were analyzed. The results showed that the optimum concentrations of maltodextrin and xanthan gum were 9.016% and 0.077%. At these optimal conditions, the anthocyanin, flavonoid, polyphenol, tannin, moisture content and particle size of obtained spray dried powder were 6.657 mg CE/100g; 28.476 mg QE/g; 28.346 mg GAE/g; 26.591 mg TAE/g, 6.602% and 6.135 µm, respectively.