Table 1: Linear regression parameters for rifaximin by HPTLC method.

ParametersRifaximin

Linearity rangea (ng/band)400–3200
Correlation coefficient ( )
Slope ± SD ( )
Confidence limit of slopec4.76–4.91
Intercept ± SD ( )
Confidence limit of interceptc197.40–420.18
Limit of detection (ng/band)61.25
Limit of quantitation (ng/band)185.59
Bartlett’s testb ( )0.267

replicates, bcalculated value less than critical value , and c95% confidence limit.