Table 2.
Correlation coefficients among DPPH radical scavenging activity (DPPH assay), superoxide radical scavenging activity (NBT assay), ferrous ion chelating ability (Chelating assay), reducing power assay (Reducing power), and total phenolic contents (TPC) in extracts.
| DPPH assay | NBT assay | Chelating assay | Reducing power | TPC | |
|---|---|---|---|---|---|
| DPPH assay | — | 0.103 | 0.004 | 0.752* | 0.787* |
| NBT assay | 0.103 | — | 0.711* | 0.577 | 0.581 |
| Chelating assay | 0.004 | 0.711* | — | 0.424 | 0.480 |
| Reducing power | 0.752* | 0.577 | 0.424 | — | 0.966** |
| TPC | 0.787** | 0.581 | 0.480 | 0.966** | — |
*P < 0.05; **P < 0.01.