Table 1.
Yields, total phenolic content, DPPH free radical scavenging and reducing power of Tasmanian pepper leaf, lemon myrtle and anise myrtle extracts.
| Methanol | Ethanol | Water | Hexane | |||
|---|---|---|---|---|---|---|
| Yields (% w/w) | LM | 22.8 ± 0.4 a | 17.9 ± 0.5 b | 16.3 ± 0.6 c | 6.41 ± 0.2 d | |
| TPL | 28.3 ± 0.3 a | 27.8 ± 0.4 a | 25.8 ± 0.3 b | 8.13 ± 0.5 c | ||
| AM | 21.8 ± 0.4 a | 16.8 ± 0.6 b | 17.5 ± 0.7 b | 3.88 ± 0.3 c | ||
| Total phenolic content (mg GAE/gDW) | LM | 419.3 ± 13.5 a | 373.2 ± 12.6 b | 281.7 ± 21.6 c | 17.5 ± 1.7 d | |
| TPL | 246.3 ± 17.4 a | 215.5 ± 12.8 a | 157.4 ± 14.6 b | 35.7 ± 1.9 d | ||
| AM | 314.2 ± 17.3 a | 310.6 ± 18.3 a | 283.3 ± 16.5 b | 30.5 ± 2.1 c | ||
| DPPH (IC50 µg/mL) | LM | 14.4 ± 0.4 a | 14.3 ± 0.6 a | 31.0 ± 1.1 b | 1678.3 ± 27.9 c | |
| TPL | 36.9 ± 0.6 a | 36.2 ± 0.8 a | 126.4 ± 16.1 b | 1004.7 ± 35.9 c | ||
| AM | 19.1 ± 1.2 a | 21.1 ± 0.1 a | 61.9 ± 0.2 b | 1342.7 ± 22.9 c | ||
| Reducing power (Absorbance 700 nm) | 0.01 mg/mL extracts | LM | 0.59 ± 0.01 a | 0.59 ± 0.02 a | 0.32 ± 0.01 b | 0.03 ± 0.01 c |
| TPL | 0.29 ± 0.01 a | 0.31 ± 0.01 a | 0.14 ± 0.01 b | 0.04 ± 0.02 c | ||
| AM | 0.49 ± 0.02 a | 0.45 ± 0.02 a | 0.25 ± 0.01 b | 0.025 ± 0.01 c | ||
| 0.1 mg/mL extracts | LM | 1.03 ± 0.01 a | 1.07 ± 0.02 a | 0.56 ± 0.02 b | 0.03 ± 0.01 c | |
| TPL | 0.51 ± 0.01 a | 0.52 ± 0.01 a | 0.30 ± 0.02 b | 0.07 ± 0.01 c | ||
| AM | 0.87 ± 0.1 a | 0.84 ± 0.03 a | 0.41 ± 0.03 b | 0.03 ± 0.01 c | ||
DPPH: 2,2-diphenyl-1-picrylhydrazyl; LM: lemon myrtle; TPL: Tasmanian pepper leaf; AM: anise myrtle; mg GAE/gDW: milligram gallic acid equivalents/g dry weight. Reducing power results expressed from testing concentrations of 0.01 and 0.1 mg/mL of extracts. Means with different letters within the same row are significantly different at p < 0.05.