Table 4: Robustness of the developed spectrophotometric method.

Drug% Recovery* ± SD
CTZEBSFXDKETLOR

No variation**
pH of acetate buffer
 3.2
 3.4
Acetate buffer conc.
 0.15 M
 0.25 M
Erythrosine B conc.
 0.14% w/v
 0.16% w/v
Erythrosine B volume
 0.44 mL
 0.46 mL
Reaction time
 8 min.
 10 min.

Average of six replicates.
**No variation in the assay condition of the proposed method.