Table and Figure ). An SPBA solution (in 225 mM NaNO3) was successfully encapsulated in liposomes following the procedure described for lucigenin in Section 3. When tested without transporter, no leaking of SPBA was observed, even after 2-7 days following the preparation of the liposomes (Figure ). Transport results obtained with SPBA were identical to those obtained with lucigenin (Figure ), making SPBA a good alternative to lucigenin for experiments over longer time scales (24 h instead of 2-3 h). Anion KSV (M -1 ) (SPBA, this work)