ELECTROCATALYTIC OXIDATION OF CARBOHYDRATES AT A MOLECULAR DEPOSITIONFILM ELECTRODE BASED ON WATER-SOLUBLE COBALT PHTHALOCYANINE AND ITS APPLICATION TO FLOW-THROUGH DETECTION

A novel chemically modified electrode was achieved based on a molecula r deposition technique in which water-soluble cobalt phthalocyanine te trasulfonate (CoTsPc) was alternately deposited with a bipolar pyridin e salt (PyC(6)BPC(6)Py) on a 3-mercaptopropionic acid-modified Au elec trode. The modified electrode was shown to exhibit an electrocatalytic response for the oxidation of carbohydrates. Carbohydrates were detec ted by flow-injection analysis at the modified electrode with high sen sitivity. Detection limits obtained in this manner range from 150 pmol injected for glucose and fructose to 600 pmol injected for maltose an d sucrose.