Optimized spouted bed production of antioxidant dried powder from green tea

Author(s)

Arem, Yan G. ; Morais, Maria S. ; Oliveira, Wanderley P.

• Document type: Journal article
• Source: Drying Technology; v. 42, n. 5, p. 17-pg., 2024-02-13.

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((R)) or glass beads), drying aid concentration (colloidal SiO2-Aerosil 200((R))), and drying inlet temperatures (80, 110, or 140 degrees 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((R)) beads and a drying temperature of 110 degrees 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 mu g/mL, surpassing the synthetic antioxidant butylated hydroxytoluene (BHT), which had an IC50 of 12.5 mu g/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. (AU)

• FAPESP's process: 21/08152-0 - Challenge of the use of drugs in fish farming in the context of One Health: evaluation of efficacy, safety and risk analysis
• Grantee: Susanne Rath
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 18/26069-0 - Encapsulation of essential oils for use in pharmaceutical compositions with antimicrobial activity
• Grantee: Wanderley Pereira Oliveira
• Support Opportunities: Regular Research Grants