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Vortex-assisted emulsification semimicroextraction for the analytical control of restricted ingredients in cosmetic products: determination of bronopol by liquid chromatography

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Abstract

Vortex-assisted emulsification semimicroextraction is proposed as a one-step solution-extraction procedure for sample preparation in cosmetic products. The procedure allows rapid preparation based on dispersion of the sample in a mixture of 1 mL of n-hexane and 0.5 mL of ethanol, followed by the addition of 0.5 mL of water and centrifugation to obtain two separated phases. This procedure provides good sample clean-up with minimum dilution and is very useful for the determination of ingredients with restricted concentrations, such as bronopol. The procedure was applied to the determination of bronopol by liquid chromatography with UV detection. The best chromatographic separation was obtained by using a C18 column set at 40 °C and performing a stepwise elution with a mixture of ethanol/aqueous 1 % acetic acid solution as mobile phase pumped at 0.5 mL min−1. The detection wavelength was set at 250 nm and the total run time required was 12 min. The method was successfully applied to 18 commercial cosmetic samples including creams, shampoos, and bath gels. Good recoveries and repeatability were obtained, with a limit of detection of 0.9 μg mL−1, which makes the method suitable for the analytical control of cosmetic products. Moreover, it could be considered environmentally friendly, because water, ethanol, and only a low volume of n-hexane are used as solvents.

Vortex-assisted emulsification semimicroextraction (VAEsME) for the preparation of cosmetic samples

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Acknowledgments

P.M. would like to thank the Spanish ‘Ministerio de Educación, Cultura y Deporte’ for his predoctoral grant.

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Authors and Affiliations

  1. Departamento de Química Analítica, Facultad de Química, Universitat de València, 46100, Burjassot, Valencia, Spain

    Pablo Miralles, Raquel Bellver, Alberto Chisvert & Amparo Salvador

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  1. Pablo Miralles
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  2. Raquel Bellver
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  3. Alberto Chisvert
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  4. Amparo Salvador
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Correspondence to Amparo Salvador.

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We wish to confirm that there are no known conflicts of interest associated with this publication and there has been no financial support for this work that could have influenced its outcome.

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Miralles, P., Bellver, R., Chisvert, A. et al. Vortex-assisted emulsification semimicroextraction for the analytical control of restricted ingredients in cosmetic products: determination of bronopol by liquid chromatography. Anal Bioanal Chem 408, 1929–1934 (2016). https://doi.org/10.1007/s00216-016-9306-5

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  • DOI: https://doi.org/10.1007/s00216-016-9306-5

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