A Derivative Spectrometric Method for Hydroquinone Determination in the Presence of Kojic Acid, Glycolic Acid, and Ascorbic Acid

Table 5

Results of the HQ determination in ternary and quaternary synthetic mixtures by applying the proposed spectrometric method; .

Percent ratio, HQ : GA : KA : AA	HQ concentration, μg·mL^−1		R%
	Considered	Found ± SD
1 : 5 : 1 : 0	2	1.85 ± 0.08	92.55
1 : 5 : 2 : 0	2	1.87 ± 0.06	93.62
4 : 0.75 : 0 : 2.5	8	8.34 ± 0.35	104.26
1 : 1 : 1 : 1	2	1.83 ± 0.05	91.49
2 : 5 : 1 : 5	4	4.19 ± 0.05	104.79