Development and Validation of a Stability Indicating RP-HPLC Method for the Determination of Two Sun Protection Factors (Koptrizon and Tinosorb S) in Topical Pharmaceutical Formulations Using Experimental Designs

Table 4

Accuracy results for Koptrizon and Tinosorb S (𝑛=3).

Active; components	Amount added; (μg mL^−1)	Amount recovered; (μg mL^−1)	% Recovery ± SD; % RSD
	74.9	75.4	100.7 ± 0.63; 0.62
KPT	149.8	153.0	102.1 ± 0.49; 0.48
	224.7	220.4	98.1 ± 0.53; 0.54
	75.6	75.5	99.0 ± 0.00; 0.00
TIN	151.2	154.7	102.3 ± 1.56; 1.52
	226.8	222.7	98.2 ± 0.33; 0.34