Enantioselective determination of oxybutynin and N-desethyloxubutynin in rat liver microsomal fraction using HPLC and LPME: application to an in vitro biotransformation study - Fonseca, Patrícia da; Bonato, Pierina Sueli; Ciancaglini, Pietro; Freitas, Luís Alexandre Pedro de (Congresso Latino Americano de Cromatografia e Técnicas Relacionadas, 2008)