## 3 Results
### Antioxidant Capacity  
The antioxidant capacities of the four solvent extracts of the two types of Hang Ju were evaluated and compared using three methods, namely DPPH free radical scavenging activity (Figure 1a), ferrous ion chelating ability (Figure 1b), and reducing power (Figure 1c), at different concentrations (0.1-1.0 mg/mL). At 1.0 mg/mL, the highest DPPH radical scavenging activity was obtained with ethanol, followed by distilled water, ethyl acetate, and n-hexane (\(p<0.05\) for all solvents) (Table 2). DPPH radical scavenging activity of No. 1 was significantly higher than that of No. 2 for all solvents except distilled water (\(p<0.05\) for ethyl acetate; \(p<0.001\) for both ethanol and n-hexane). DPPH radical scavenging activity of No. 2 extracted with distilled water was significantly higher than that of No. 1 extracted with distilled water (\(p<0.001\)). At 1.0 mg/mL, for No. 1, the ferrous ion chelating ability was highest when ethanol was used as the solvent, followed by ethyl acetate, n-hexane, and distilled water (\(p<0.05\) for all solvents) (Table 2). For No. 2, the ferrous ion chelating ability was also highest when ethanol was used as the solvent, followed by distilled water, ethyl acetate, and n-hexane (\(p<0.05\)). Regardless of which of the four solvents was used, the ferrous ion chelating ability of the extracts obtained from No. 1 was significantly higher than that of the extracts obtained from No. 2 (all \(p<0.001\)) (Table 2). Furthermore, at 1.0 mg/mL, the highest reducing power was obtained with ethanol as the solvent, followed by distilled water, ethyl acetate, and n-hexane (\(p<0.05\) for all solvents) (Table 2). The reducing power of No. 1 was significantly higher than that of No. 2 extracted with the same solvent (\(p<0.01\) for ethyl acetate; \(p<0.001\) for both ethanol and n-hexane). However, the reducing power of No. 2 extracted with distilled water was significantly higher than that of No. 1 extracted with distilled water (\(p<0.001\)). \begin{table} \begin{tabular}{c c c c c c} \hline \hline  & **Sample Number** & **Ethanol (A)** & **Ethyl Acetate (B)** & **N-Hexane (C)** & **Distilled Water (D)** \\ \hline DPPH scavenging & No. 1 & 90.84 \(\pm\) 0.85 1  & 20.68 \(\pm\) 0.73 1  & 11.49 \(\pm\) 0.61 2  & 53.28 \(\pm\) 0.73 2  \\ activity (\%) & No. 2 & 76.80 \(\pm\) 0.61 3  & 18.57 \(\pm\) 0.61 4  & 4.29 \(\pm\) 0.35 4  & 67.72 \(\pm\) 0.85 5  \\ \hline Ferrous ion chelating & No. 1 & 55.44 \(\pm\) 0.03 1  & 49.75 \(\pm\) 0.04 2  & 42.69 \(\pm\) 0.02 3  & 40.74 \(\pm\) 0.03 2  \\ ability (\%) & No. 2 & 31.81 \(\pm\) 0.03 3  & 27.66 \(\pm\) 0.03 4  & 24.36 \(\pm\) 0.04 4  & 31.09 \(\pm\) 0.02 5  \\ \hline Reducing power & No. 1 & 0.988 \(\pm\) 0.003 1  & 0.201 \(\pm\) 0.002 2  & 0.097 \(\pm\) 0.002 2  & 0.681 \(\pm\) 0.015 2  \\ No. 2 & 0.861 \(\pm\) 0.003 3  & 0.185 \(\pm\) 0.003 4  & 0.168 \(\pm\) 0.002 4  & 0.783 \(\pm\) 0.002 2  \\ \hline \hline \end{tabular}   
* [FOOTNOTE:*]Footnote *: [FOOTNOTE:*]FootnoteCombining the DPPH radical scavenging activity, ferrous ion chelating ability, and reducing power results, we found that the antioxidant capacity of ethanol extract (No. 1A) is the highest among all extracts, while the antioxidant capacity of n-hexane extract (No. 2C) is the lowest. Antioxidant capacities are positively correlated with both total phenol and total flavonoid contents, as shown in Table 3. The Pearson correlation coefficients for total phenol content are the highest for DPPH scavenging activity (\(r=0.8444\)), followed by reducing power (\(r=0.8097\)) and ferrous ion chelating ability (\(r=0.4158\)). The correlation coefficients for total flavonoid content are the highest for ferrous ion chelating ability (\(r=0.8845\)), followed by DPPH scavenging activity (\(r=0.5465\)) and reducing power (\(r=0.5100\)). Figure 1: DPPH radical scavenging activity (**a**), ferrous ion chelating ability (**b**), and reducing power (**c**) of the extracts obtained with different solvents from No. 1 and No. 2. No. 1A and No. 2A are ethanol extracts, No. 1B and No.