Table 2.
The EC 50 values for the free radical scavenging activity of three different crude extracts from bee pollen and corn pollen, plus the reference standard (ascorbic acid) for comparison
| Sample | EC 50 (μg/ml) ƒ | r 2 ƒ |
|---|---|---|
|
Bee corn pollen extracts |
|
|
| CMEb |
428.6 ± 29.0b |
ND |
| CDEb |
7.47 ± 0.12a* |
1 |
| CHEb |
>1,000c |
ND |
|
Floral corn pollen extracts |
|
|
| CMEp |
365.2 ± 38.8bb |
1 |
| CDEp |
212.3 ± 13.6aa** |
1 |
| CHEp |
>1000cc |
ND |
| Ascorbic acid | 8.57 ± 0.24* | 1 |
ƒ EC50 values were calculated by linear regression (r2 = the correlation coefficient). ND represents no available data. Means within a group of three crude extracts of each sample with a different superscript letter (bee pollen extracts) or pair of letters (floral pollen extracts) are significantly different (p ≤ 0.05; One way ANOVA), whilst a significant difference between groups is indicated by * or **.