1. University of Sciences and Technologies Houari Boumediène, Faculty of Chemistry, Laboratory of Organic and Functional Analysis, U.S.T.H.B, B.P. 32 El Alia, Bâb Ezzouar, Algiers, Algeria
2. Laboratory of Mass Spectrometry, L.S.M, University of Liege, Allée du 6 Août, Bât B6c, 4000 Liege (Sart-Tilman), Belgium