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The bioactive peptides bombesin, neurotensin and luteinizing hormone releasing hormone (LH-RH) can be adsorbed and accumulated at carbon paste electrodes and determined at low solution concentrations by potentiometric stripping analysis (PSA). The determination is based on the oxidation peaks of tryptophan (at about 0.7 V, against AgAgCl reference electrode) and/or of tyrosine (at about 0.55 V)....
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