Abstract
In this paper we have investigated the kinetic decomposition of 2-chloroethylnitrososulfamides (CENS) in fetal calf serum. The study was monitored by on-line solid phase extraction linked to RP-LC-MS. We demonstrated that CENS are less stable in fetal calf serum than in aqueous buffer at pH 7.4 and 37 degrees C. Moreover, we have shown that partition coefficient of CENS can be correlated to the kinetics decomposition, and we observe that the stability is better for lipophilic CENS. The different metabolites after decomposition have been tentatively identified by RP-HPLC-MS. This study indicates the formation of several metabolites resulting from a mechanism of decomposition more complex than in aqueous phosphate buffer, nevertheless, leading to the same main products.
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