Photolytic degradation of fluoroquinolone carboxylic acids in aqueous solution : Part I: Primary photoproducts and half-lives (ESPR 1/1997, pp. 10–15) Part II: Isolation and structural elucidation of polar photometabolites (ESPR 2/1997, pp. 61–67)
1997
Burhenne, Jürgen | Ludwig, Marc | Spiteller, M. (Michael)
Subsequent to irradiation with a xenon lamp simulating sunlight, fluoroquinolone carboxylic acids in aqueous solution form polar pyridone dicarboxylic and tricarboxylic acids. After liquid/liquid partition with chloroform/water these substances can be isolated by ion exchange chromatography of the aqueous phase. They can be regarded as intermediate compounds on the route to a complete photomineralization. The structural elucidation is performed by such mass spectroscopic methods as MS, GC/MS and HPLC/MS, whereby HPLC/MS shows the highest reliability. Additionally¹H- and¹³C-NMR measurements confirm the structure of the main polar degradation product.
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