Abstract
This paper deals with the development of a novel method for simultaneous determination of estradiol, its degradation product estrone, and two preservatives, methylparaben and propylparaben, in the topical preparation Estradiol HBF. After optimization of the analytical conditions the method was validated and applied in studies of the stability of the topical preparation Estrogel HBF. Separation of all these compounds was performed on a Supelco Discovery C18 (250 mm×3.0 mm, 5 μm) analytical column. A mixture of acetonitrile, methanol, and water (23:24:53 v/v) was chosen as mobile phase. UV absorbance at 225 nm was used for detection and quantitation of analytes. The total analysis time was less than 12 min at a flow rate of 0.9 mL min−1. All the compounds were isolated from the topical gel by simple extraction with an acetonitrile solution of hydrocortisone, as internal standard, and using sonication and centrifugation thereafter. The supernatant was injected directly on to the analytical column. The recovery of the procedure was from 96.9 to 100.4%. Validation of method according international guidelines was successfully performed.
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Acknowledgement
The authors gratefully acknowledge the financial support of the Grant Agency of the MSMT of the Czech Republic—FRVS No. 2999/2003—and by the Research project LN00B125 of the Czech Ministry of Education.
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Nováková, L., Solich, P., Matysová, L. et al. HPLC determination of estradiol, its degradation product, and preservatives in new topical formulation Estrogel HBF. Anal Bioanal Chem 379, 781–787 (2004). https://doi.org/10.1007/s00216-004-2532-2
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DOI: https://doi.org/10.1007/s00216-004-2532-2