Table 7: Robustness data for Doxofylline.

Factors% RSDTailing factor ( )Efficiency (theoretical plates)Resolution

pH of mobile phase
 pH 4.31.34151.362734714.724
 pH 4.70.91341.391727314.810

Flow rate
 0.8 mL/min0.51801.367729414.736
 1.2 mL/min0.80751.386729214.745

Solvent %
 −2%1.19181.348732714.698
 +2%0.92941.413729314.672