Development and validation of a HPLC and a UV derivative spectrophotometric methods for determination of hydroquinone in gel and cream preparations.


A high performance liquid chromatographic (HPLC) and a ultraviolet derivative spectrophotometric (UVDS) methods were developed and validated for the quantitative determination of hydroquinone (HQ) in gels and creams containing this compound as a unique active principle. Validation parameters such as linearity, precision, accuracy, specificity, limit of detection (LOD) and limit of quantitation (LOQ) were determined. HPLC was carried out by reversed phase technique on a RP-18 column with a mobile phase composed of methanol and water (20:80, v/v). The linearity in the range of 6.0-30.0 microg/mL present a correlation coefficient (r) of 0.9999, calculated by least square method. The LOD and LOQ were 0.08 and 0.26 microg/mL, respectively. Based on the preliminary spectrophotometric profile of HQ, a signal at 302.0 nm of the first derivative spectrum (1D302.0) was found adequate for validation. The linearity between signal 1D302.0 and concentration of HQ in the range of 10.0-26.0 microg/mL in sulfuric acid (0.1N) present a correlation coefficient (r) of 0.9999. The LOD and LOQ were 0.14 and 0.46 microg/mL, respectively. Statistical analysis by t- and F-tests, showed no significant difference at 95% confidence level between the two proposed methods.


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  • Authors

    López García P

    Department of Pharmacy, Faculty of Pharmaceutical Sciences, University of São Paulo, Brazil. pedrolg@intelnet.net.gt

    Rocha Miritello Santoro MI

    Kedor-Hackmann ER

    Kedor-Hackman ER

    Kumar Singh A


    Journal of pharmaceutical and biomedical analysis 39:3-4 2005 Sep 15 pg 764-8


    Chemistry, Pharmaceutical
    Chromatography, High Pressure Liquid
    Drug Industry
    Regression Analysis
    Reproducibility of Results
    Sensitivity and Specificity
    Spectrophotometry, Ultraviolet
    Time Factors
    Ultraviolet Rays

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't



    PubMed ID