Abstract
Differential scanning calorimetry (DSC) was used as a screening technique for assessing the compatibility of lipoic acid with some currently employed cosmetic excipients. In the first phase of the study DSC was used as a tool to detect any interaction. Based on the DSC results alone, methyl p-hydroxybenzoate, propyl p-hydroxybenzoate, butylated hydroxytoluene, non ionic self emulsifying wax, propylene glycol and acetylated lanolin were found to exhibit interaction with lipoic acid. Stressed binary mixtures (stored at 50 °C for 1 week) of lipoic acid and excipients were evaluated by HPLC. Binary mixtures were evaluated by IR spectroscopy.
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Acknowledgements
This work was supported by grant B116/2004-2008 to M. T. Pizzorno and A. I. Segall from UBA.
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Moyano, M.A., Broussalis, A.M. & Segall, A.I. Thermal analysis of lipoic acid and evaluation of the compatibility with excipientes. J Therm Anal Calorim 99, 631–637 (2010). https://doi.org/10.1007/s10973-009-0351-6
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DOI: https://doi.org/10.1007/s10973-009-0351-6