Abstract:Aim: Transdermal analysis is proposed for vitamin D3 and its hydroxylated metabolite to overcome problems associated with blood analysis. Methods: Vitamin D3 was extracted directly from skin with solid patches and liquid phases. Deuterium-labeled vitamin D3 was added to the extraction solutions to compensate for variability and accurately determine the rate of transdermal transfer. Of the different extraction solvents tested, 50:50 octanol:isopropanol showed the best results, with an accuracy of 115% and repro… Show more
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