Quantification of Sunscreen Ethylhexyl Triazone in Topical Skin-Care Products by Normal-Phase TLC/Densitometry

Table 2

Results of repeatability, intermediate precision, and robustness tests.

	HP TLC plates, automatic spotting (𝑛=3), 2 μL spot^−1				TLC plates, manual spotting (𝑛=3), 1 μL spot^−1	Modified mobile phases (𝑛=3)
		Day 1, Analyst 1		Day 2, Analyst 2
		Analysis A	Analysis B
Sample A; Method A	μg spot^−1	0.46	0.48	0.48	0.22	0.47
	% in formulation	2.30	2.40	2.40	2.20	2.35
	CV%	1.8	1.7	2.2	4.1	1.5
Sample B; Method B	μg spot^−1	0.19	0.20	0.21	0.10	0.20
	% in formulation	0.95	1.00	1.05	1.00	1.00
	CV%	2.7	2.1	2.5	5.1	2.3