Compound

Conc. ppm

Rct Ω cm²

Cdl *10 4 F cm⁻²

θ

% IE_EIS

1 M HCl

- - -

129.4

0.689

-----

-----

Turmeric extract

50

189.5

0.962

0.317

31.7

100

208.7

0.927

0.380

38.0

150

244.3

0.885

0.470

47.0

200

247.5

0.873

0.477

47.7

250

253.1

0.657

0.489

48.9

300

261.0

0.638

0.504

50.4