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Macrocyclic Antibiotics as Chiral Selectors in the Design of Enantioselective, Potentiometric Membrane Electrodes

Abstract Two enantioselective, potentiometric membrane electrodes, based on macrocyclic glycopeptide antibiotics—vancomycin and teicoplanin—were designed. Acetyl‐L‐carnitine was selected as model analyte. The linear concentration ranges for the proposed electrodes were 10−5–10−2 mol L−1 for the vancomycin‐based electrode and 10−4–10−2 mol L−1 for the teicoplanin‐based electrode, with slopes of 58.1 and 55.0 mV/p (acetyl‐L‐carnitine), respectively. The enantioselectivity was determined over D‐carnitine. The surfaces of the electrodes are easily renewable by polishing on alumina paper.