Resumo:
In this study, we described ways to improve the antioxidant properties of coffee-leaf tea by adding areca nut powder and stevia leaves. A non-factorial completely randomized design (RALF) was used in this study. We included five treatment formulations with five repetitions per formulation, which included F1 (100% coffee leaves: 0% areca nut: 0% stevia), F2 (95% coffee leaves: 1.5% areca nut: 3.5% stevia), F3 (90% coffee leaves: 3% areca nut: 7% stevia), F4 (85% coffee leaves: 4.5% areca nut: 10.5% stevia), and F5 (80% coffee leaves: 6% areca nut: 14% stevia). The results showed that adding areca nut powder and stevia leaves significantly improved the antioxidant properties of coffee-leaf tea. The IC50 value of the tea decreased by 67.96%, and its total phenol content increased by 38.85%. The water content and ash content of coffee-leaf tea produced in this study met the SNI standards. The results of the organoleptic tests showed whether the panelists accepted the color and taste of the samples.
