Stationary electrochemical analysers are advantageous tools for detection of electroactive species. There advantages are low cost, sensitivity and repeatability. However, non-automated injection of samples belongs to their main disadvantages. We aim our attention to present a new electrochemical tool connected with unique autosampler enabling us to inject units of mu l, which is essential in for detection of biological samples. The analyser can be used for detection of peptides, proteins, nucleic acids, drugs. Moreover, the highest sensitivity has for thiols. The recent advances in the field of electrochemistry of mentioned biologically active compounds, mainly metallothionein, are also discussed.