Antioxidant Potential and Oil Composition of Callistemon viminalis Leaves
Table 1
Antioxidant activity of C. viminalis leavesa.
Extracts/fraction/standard
Yield (g/100 g)
Total phenolic contentsb (mg/g)
Total flavonoid contentsc (mg/g)
DPPH, IC50 (g/mL)
Inhibition in linoleic acid system (%)
Petroleum ether
2.30 ± 0.04
0.27 ± 0.001
2.25 ± 0.04
56.2 ± 0.54
40.1 ± 0.52
Chloroform
1.90 ± 0.02
0.71 ± 0.007
6.53 ± 0.06
38.2 ± 0.45
66.4 ± 0.77
Ethylacetate
2.15 ± 0.03
0.48 ± 0.005
5.11 ± 0.04
45.8 ± 0.51
54.1 ± 0.52
n-Butanol
2.40 ± 0.04
0.44 ± 0.004
3.96 ± 0.04
52.1 ± 0.62
48.2 ± 0.52
Acetone
1.95 ± 0.02
0.63 ± 0.007
6.43 ± 0.06
41.4 ± 0.52
56.8 ± 0.65
Absolute methanol
2.50 ± 0.04
0.85 ± 0.009
7.96 ± 0.08
28.4 ± 0.19
70.2 ± 0.77
95% methanol
2.20 ± 0.03
0.52 ± 0.006
6.69 ± 0.07
34.1 ± 0.41
68.2 ± 0.77
90% methanol
2.35 ± 0.03
0.75 ± 0.007
5.95 ± 0.07
45.2 ± 0.51
56.4 ± 0.61
BHT
—
—
—
19.2 ± 0.22
92.8 ± 0.91
Values are mean ± S.D of three separate experiments.
bTotal phenolic contents expressed as gallic acid equivalent.
cTotal flavonoid contents are expressed as catechin equivalent.
