Elucidation of the decomposition pathways of protonated and deprotonated estrone ions: application to the identification of photolysis products

作者：Bourcier Sophie^*; Poisson Clementine; Souissi Yasmine; Kinani Said; Bouchonnet Stephane; Sablier Michel

来源：Rapid Communications in Mass Spectrometry, 2010, 24(20): 2999-3010.

DOI：10.1002/rcm.4722

With the future aim of elucidating the unknown structures of estrogen degradation products, we characterized the dissociation pathways of protonated estrone (E1) under collisional activation in liquid chromatography/tandem mass spectrometry (LC/MS/MS) experiments employing a quadru-pole time-of-flight mass spectrometer. Positive ion and negative ion modes give information on the protonated and deprotonated molecules and their product ions. The mass spectra of estrone methyl ether (CH(3)-E1) and estrone-d(4) (E1-d(4)) were compared with that of El in order (i) to elucidate the dissociation mechanisms of protonated and deprotonated molecules and (ii) to propose likely structures for each product ions. The positive ion acquisition mode yielded more fragmentation. The mass spectra of El were compared with those of estradiol (E2), estriol (E3) and 17-ethynylestradiol (EE2). This comparison allowed the identification of marker ions for each ring of the estrogenic structure. Accurate mass measurements have been carried out for all the identified ions. The resulting ions revealed to be useful for the characterization of structural modifications induced by photolysis on each ring of the estrone molecule. These results are very promising for the determination of new metabolites in the environment.

• 出版日期2010-10