Journal of Analytical Methods in Chemistry / 2015 / Article / Tab 3 / Research Article
Quantification of Sunscreen Benzophenone-4 in Hair Shampoos by Hydrophilic Interactions Thin-Layer Chromatography/Densitometry or Derivative UV Spectrophotometry
% BZ4 in spiked shampoo
Chromatographic Spectrophotometric 0 derivative 285 nm 2nd derivative 285 nm 0.5 Theoretical µ g spot−1 0.25a Shampoo sample concentration mg mL−1 2.5 2.5 Experimental µ g spot−1 0.25 Experimental % BZ4 in shampoo 0.53 0.51 Recovery % 100.0 Recovery % 106.7 102.0 CV% ( ) 1.99 CV% ( ) 0.62 0.70 1.0 Theoretical µ g spot−1 0.50a Shampoo sample concentration mg mL−1 2.5 2.5 Experimental µ g spot−1 0.49 Experimental % BZ4 in shampoo 1.05 1.02 Recovery % 98.0 Recovery % 104.7 102.0 CV% ( ) 1.10 CV% ( ) 0.87 0.81 1.5 Theoretical µ g spot−1 0.75a Shampoo sample concentration mg mL−1 2.5 2.5 Experimental µ g spot−1 0.77 Experimental % BZ4 in shampoo 1.59 1.53 Recovery % 102.7 Recovery % 106.1 102.6 CV% ( ) 1.61 CV% ( ) 0.88 0.67 2.0 Theoretical µ g spot−1 1.00a Shampoo sample concentration mg mL−1 2.5 2.5 Experimentalµ g spot−1 1.03 Experimental % BZ4 in shampoo 2.10 2.06 Recovery % 103.0 Recovery % 105.1 103.2 CV% ( ) 0.58 CV% ( ) 1.03 1.05 5.0 Theoretical µ g spot−1 1.25b Shampoo sample concentration mg mL−1 1.0 1.0 Experimentalµ g spot−1 1.27 Experimental % BZ4 in shampoo 5.32 5.07 Recovery % 102.0 Recovery % 106.4 101.4 CV% ( ) 1.33 CV% ( ) 1.54 1.41
Shampoo sample concentration—50 mg mL−1 .
b Shampoo sample concentration—25 mg mL−1 .