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

Table 4

Results of the HQ determination in synthetic binary mixtures by applying the proposed spectrometric method;.

Mixtures	Percent ratio, HQ : KA/AA/GA	HQ concentration, μg·mL^−1		%
		Considered	Found ± SD
HQ + KA	4 : 1	4	4.04 ± 0.08	101.06
	2 : 1	4	4.04 ± 0.05	101.06
	1 : 1	4	4.06 ± 0.07	101.33
	1 : 1.5	4	3.96 ± 0.05	99.47
	1 : 2	4	3.97 ± 0.04	99.20
HQ + AA	2 : 1	4	3.99 ± 0.06	99.73
	1 : 1	4	3.98 ± 0.05	99.47
	1 : 2	4	4.02 ± 0.04	100.53
	1 : 2.5	4	4.00 ± 0.06	100.00
	1 : 5	4	4.04 ± 0.07	101.06
HQ + GA	1 : 1	4	4.04 ± 0.05	101.06
	1 : 2	4	4.05 ± 0.06	101.17
	1 : 3	4	4.03 ± 0.07	100.80
	1 : 4	4	4.02 ± 0.06	100.53
	1 : 5	4	4.06 ± 0.08	101.60