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An amperometric glucose biosensor has been developed based on immobilization of glucose oxidase (GOD) in electrochemically polymerized polytyramine (PTY) and overoxidised polypyrrole (OPPY) on platinized carbon paste electrode (PCPE). By providing a large apparent surface area with the micropores of the electrodeposited platinum particles on the PCPE, GOD was added, and the sensor was more sensitive...