Optimization of Spray Drying Process Conditions for Rosemary Extracts (Rosmarinus Officinalis L.)

Rosemary extract, known for its antioxidant properties and potential applications in various industries, can be effectively processed through spray drying to enhance its usability. This study aimed to investigate the influence of spray drying conditions on rosemary extract. One–factor–at–a–time, analysis of variance, and response surface methodology were employed. The yield of the spray–drying process and Total Polyphenol Content (TPC) of obtained powders were taken as response variables. The optimal conditions included a dried extract concentration of ۲۵ % w/w, gum Arabic to maltodextrin ratio of ۳:۷ % w/w, a solid concentration of ۲۵.۳ % w/v, an inlet temperature of ۱۵۸ °C, and a feed flow rate of ۱۲ mL/min. Under these conditions, the yield of the final products reached ۵۷.۳۳ ± ۰.۲۰ % w/w, whereas its TPC was measured at ۵۷.۳۹ ± ۰.۹۳ mg GAE/g powder. These findings not only optimize production efficiency from laboratory to industrial scales but also reveal new potential applications of rosemary extract in cosmetics, food products, and pharmaceuticals.

Keywords:

Rosemary , spray drying , Optimization , Total polyphenol content , Process yield