Compound | Conc. ppm | Rct Ω cm2 | Cdl *10 4 F cm−2 | θ | % IEEIS |
1 M HCl | - - - | 129.4 | 0.689 | ----- | ----- |
Catharanthus extract | 50 | 271.20 | 9.890 | 0.523 | 52.3 |
100 | 283.0 | 1.292 | 0.543 | 54.3 | |
150 | 286.1 | 1.064 | 0.548 | 54.8 | |
200 | 342.7 | 0.990 | 0.622 | 62.2 | |
250 | 342.9 | 0.969 | 0.623 | 62.3 | |
300 | 350.1 | 0.938 | 0.630 | 63.0 |