Optimization of the spray-drying parameters for developing guava powder

Spray-drying process for guava pulp was optimized by response surface methodology. The factors were inlet air temperature (130-170 degrees C) and maltodextrin DE 10 content (60-75% wb pulp solids basis), while powder yield, moisture, ascorbic acid retention, rehydration, and hygroscopicity were the responses variables. Inlet air temperature caused a positive effect on powder yield and ascorbic acid retention, while moisture content, rehydration, and hygroscopicity were negatively affected by maltodextrin content. The optimal conditions for drying guava pulp were an inlet air temperature of 148 degrees C and maltodextrin content of 75% wb pulp solids basis; these parameters led to 67.9% powder yield, 4.2% wb moisture content, 90% ascorbic acid retention, 60 s rehydration time, hygroscopicity 21.7 g of water/100 g of dry matter and 9.2 mu m of particle mean diameter. Practical application Nowadays an increase in the use of foods that are easy to make or ready for direct consumption has received a significant attention. Guava fruit has many health benefits potential, but it has short shelf life and seasonal crop. This research give the information about the effect of inlet air temperature and maltodextrin content on spray drying process and physicochemical properties of the developed guava powder. It is important for dehydrated pulp and juice producers to avoid production problems, such as stickiness and low yield.