## 3 Results  
The black tea demonstrated significantly lower EC\({}_{50}\) or higher antiradical activity for the performed antioxidant assays (DPPH, ABTS, NO, LPO, and haemolysis) compared to the _Ocimum gratissimum_ aqueous infusion (DPPH, ABTS, LPO, and haemolysis) (Table 1).  
\begin{table}
\begin{tabular}{c c c c c} \hline \multirow{2}{*}{**TEST**} & **RATIO** & **EC\({}_{50}\) (\(\mu\)g/mL)** & **CI at EC\({}_{50}\)** &
\begin{tabular}{c} **INTERACTION** \\ **TYPE** \\ \end{tabular} \\ \hline \multirow{8}{*}{**DPPH**} & 1:0 & 77.86 \(\pm\) 1.49 \({}^{\text{a}}\) & - & - \\ \cline{2-5}  & 3:1 & 89.13 \(\pm\) 1.80 \({}^{\text{b}}\) & 1.09 & Nearly additive \\ \cline{2-5}  & 2:1 & 91.72 \(\pm\) 2.05 \({}^{\text{b,c}}\) & 1.08 & Nearly additive \\ \cline{2-5}  & 1:1 & 93.24 \(\pm\) 0.83 \({}^{\text{c}}\) & 1.10 & Slight antagonism \\ \cline{2-5}  & 1:2 & 91.43 \(\pm\) 1.89 \({}^{\text{b,c}}\) & 1.04 & Nearly additive \\ \cline{2-5}  & 1:3 & 106.96 \(\pm\) 2.30 \({}^{\text{d}}\) & 1.20 & Antagonism \\ \cline{2-5}  & 0:1 & 93.47 \(\pm\) 1.33 \({}^{\text{c}}\) & - & - \\ \hline \multirow{8}{*}{**ABTS**} & 1:0 & 44.57 \(\pm\) 1.46 \({}^{\text{a}}\) & - & - \\ \cline{2-5}  & 3:1 & 51.13 \(\pm\) 2.16 \({}^{\text{b}}\) & 1.08 & Nearly additive \\ \cline{2-5}  & 2:1 & 57.59 \(\pm\) 1.46 \({}^{\text{c}}\) & 1.18 & Antagonism \\ \cline{2-5}  & 1:1 & 59.58 \(\pm\) 1.74 \({}^{\text{c}}\)d & 1.20 & Antagonism \\ \cline{2-5}  & 1:2 & 55.11 \(\pm\) 2.01 \({}^{\text{c}}\) & 1.07 & Nearly additive \\ \cline{2-5}  & 1:3 & 60.51 \(\pm\) 2.32 \({}^{\text{e}}\) & 1.04 & Nearly additive \\ \cline{2-5}  & 0:1 & 56.70 \(\pm\) 2.34 \({}^{\text{c}}\)d & - & - \\ \hline \end{tabular}
\end{table}
Table 1: The EC\({}_{50}\), combination index, and type of antioxidant interactions of black tea and _O. gratissimum_ combination for antioxidant parameters.  
The phenolic and flavonoid contents in the BT + OG combinations were found to be similar at all ratios (3:1, 2:1, 1:1, 1:2, and 1:3), as shown in Table 2. The total phenolic content was higher for OG than for BT, whereas the flavonoid content was higher for BT in comparison to OG (Table 2). The results obtained from the combination index illustrated that the BT+OG combination showed antagonism (DPPH: 1:3, ABTS: 2:1, 1:1; NO, LPO, and haemolysis: 1:1, 1:3), slight antagonism (DPPH: 1:1, LPO: 2:1), and nearly additive interaction (DPPH: 3:1, 2:1, 1:2; ABTS: 3:1, 1:2, 1:3; NO: 3:1, 2:1, 1:2; LPC: 3:1, 1:2; and haemolysis: 3:1, 2:1, 1:2) at different ratios. The BT+OG combination demonstrated appreciable radical scavenging potential in all the antioxidant assays. The radical scavenging activity was maximum at the 3:1 combination for ABTS and LPO, while in other tests (DPPH, NO, and haemolysis), the effect was similar to that at the 2:1 ratio, as shown in Table 1.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**TEST**} & **RATIO** & **EC\({}_{\text{50}}\) (ug/mL)** & **CI at EC\({}_{\text{50}}\)** & **INTERACTION** \\  & **(BT+OG)** & **EC\({}_{\text{50}}\) (ug/mL)** & **CI at EC\({}_{\text{50}}\)** & **TYPE** \\ \hline \multirow{8}{*}{**NO**} & 1:0 & 48.53 \(\pm\) 2.57 1 ** & - & - \\ \cline{2-5}  & 3:1 & 47.99 \(\pm\) 2.60  & 1.00 & Nearly additive \\ \cline{2-5}  & 1:1 & 44.30 \(\pm\) 2.26  & 1.20 & Antagonism \\ \cline{2-5}  & 1:2 & 37.67 \(\pm\) 1.95  & 0.99 & Nearly additive \\ \cline{2-5}  & 1:3 & 45.06 \(\pm\) 3.33  & 1.21 & Antagonism \\ \cline{2-5}  & 0:1 & 39.10 \(\pm\) 2.18  \\ \hline \hline \end{tabular}
\end{table}
Table 1: _Cont._