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

Table 2

Comparison of the proposed method with the reported spectrometric methods for HQ determination.

Analytical signal/working conditions	Linear range, μg·mL^−1	Application	Ref.
/HQ in H2SO4	2–12	Body lotions	[22]
/HQ in methanolic solution	10–50	Cosmetic creams	[21]
/HQ + O2 + NH4VO3 in 2-propanol : water 1 : 1	0.025–2	Cosmetic creams	[27]
/HQ in H2SO4	10–26	Cosmetic creams	[23]
/HQ + (NH4)2MoO4 + 10% H2SO4; 20-minute reaction time, 100°C	10–100	Skin whitening formulations	[29]
/HQ + KMnO4 in alkaline medium; 30–35-minute reaction time	1–26	Pharmaceuticals	[28]
/HQ in the presence of KA, AA, and GA + K2Cr2O7 in H2SO4, instantaneous reaction; room temperature	0.22–22	Synthetic mixtures	Present work