Banana electrode
The so-called banana electrode is an electrochemical biosensor for dopamine based on banana tissue . Most of the sensors known at the time Sidwell's discovery of the banana electrode were used for the selective detection of natural amino acids . The banana electrode extended this area of application to the group of catecholamine - neurotransmitters , especially dopamine.
The function is based on the tanning reaction of dopamine to its corresponding quinone, which was catalyzed by polyphenol oxidase and discovered by Palmer in 1963 . The oxygen consumption that occurs during this reaction, which is proportional to the amount of dopamine present, is electrically detected and recorded using a classic Clark electrode .
Linear relationships between dopamine content and signal were shown for slices between 0.25 and 1 mm thick in the concentration range from 0.1 to 1 mmol / l. The response time is between 30 and 40 seconds.
swell
- ^ JS Sidwell & GA Rechnitz (1985): “Bananatrode” - An electrochemical biosensor for dopamine. In: Biotechnology Letters. Vol. 7, No. 6, pp. 419-422. doi : 10.1007 / BF01166215 .