Abstract
This study evaluated the feasibility and optimization of the spouted bed drying to produce standardized dried Camellia sinensis extract. We explored processing variables such as inert particle type (Teflon® or glass beads), drying aid concentration (colloidal SiO2—Aerosil 200®), and drying inlet temperatures (80, 110, or 140 °C). Regression analysis of the results allowed for constructing response surface graphs, highlighting variable impacts on product properties and spouted bed performance. The optimal conditions involved Teflon® beads and a drying temperature of 110 °C, resulting in a product with excellent moisture content, water activity, and active constituent retention. The product demonstrated significant antioxidant activity in DPPH assays, with an IC50 between 4.4 to 6.7 µg/mL, surpassing the synthetic antioxidant butylated hydroxytoluene (BHT), which had an IC50 of 12.5 µg/mL. Rancimat assays showed that the dried extract effectively protected crude sunflower oil from oxidation, increasing its shelf life from 8.2 to 13.1 months.
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