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- W1964090109 abstract "Photodynamic therapy (PDT) using topical 5-aminolevulinic acid (ALA), a water-soluble precursor of the potent endogenous photosensitiser, protoporphyrin IX (PpIX), is a treatment and diagnostic tool for premalignant and malignant skin cancers. However, to improve drug delivery to deeper skin lesions, more lipophilic ALA esters have been investigated. Owing to the necessity in drug delivery research for efficient and validated assays for ALA esters in solution, this paper aims to describe optimised protocols to quantify the methyl and hexyl esters of ALA. ALA esters were derivatised using acetyl acetone and formaldehyde reagents and analysed using reversed phase HPLC. For the first time, the significance of ALA-impurities in ester samples has been highlighted. Furthermore, it was shown that for a given concentration, peak areas obtained for ALA-esters were significantly smaller than those obtained for ALA (p m-ALA (38.3%) > h-ALA (33.9%). These findings may explain why, historically, some of the benefits seen with ALA-esters using cell culture models have not been demonstrated in vivo." @default.
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- W1964090109 date "2009-08-03" @default.
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- W1964090109 title "Practical Considerations in the Pharmaceutical Analysis of Methyl and Hexyl Ester Derivatives of 5-Aminolevulinic Acid" @default.
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- W1964090109 doi "https://doi.org/10.2174/1874065000903010006" @default.
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