Table 1.
Antioxidant and cytotoxic activities of L. speciosa flower extract and soluble fractions
| Samples/ Standards | Total phenolic content (mg of GAE/ g of dried extract) | Free radical scavenging activity IC50 (μg/ml) | Brine shrimp lethality bioassay LC50 (μg/ml) |
|---|---|---|---|
| ME | 17.71 ± 0.32 | 4.50 ± 0.11 | 25.70 ± 0.19 |
| HXSF | 11.15 ± 0.56 | 32.11 ± 0.58 | 2.00 ± 0.31 |
| CTCSF | 9.94 ± 0.13 | 5.15 ± 0.21 | 15.06 ± 0.43 |
| CSF | 1.42 ± 0.44 | 4.20 ± 0.41 | 18.37 ± 0.32 |
| AQSF | 19.34 ± 0.49 | 10.92 ± 0.33 | 84.02 ± 0.13 |
| Vincristine sulfate | – | – | 0.45 ± 0.04 |
| BHT | – | 27.50 ± 0.54 | – |
| Ascorbic acid | – | 5.80 ± 0.21 | – |
ME = Methanolic crude extract; HXSF = Hexane soluble fraction; CTCSF = Carbon tetrachloride soluble fraction; CSF = Chloroform soluble fraction; AQSF = Aqueous soluble fraction; BHT = Butylated hydroxytoluene; GAE = Gallic acid equivalent