Quantification of Sunscreen Benzophenone-4 in Hair Shampoos by Hydrophilic Interactions Thin-Layer Chromatography/Densitometry or Derivative UV Spectrophotometry

Table 2

Chromatographic determinations of BZ4 in the commercial shampoo (10 µL spot⁻¹, sample concentration 10 mg mL⁻¹), . Conditions: Section 2.5 (“Day 1,” “Day 2”); Section 3.2.5. (“Changed parameters”).

	Day 1		Day 2	Changed parameters
	Analysis A	Analysis B
Received	0.60 µg	0.62 µg	0.61 µg	0.62 µg
% BZ4 in shampoo	0.06%	0.06%	0.06%	0.06%
CV%	1.26	3.04	1.33	6.26