A Low Cost-Computer-Controlled and Powered Multichannel Potentiostat for General Use in Development of Inexpensive Electrochemical Sensors

摘要

Described herein, is an inexpensive 16-channel potentiostat that is both controlled and powered by a PC multifunction data acquisition card. As an enabling example, the potentiostat was used to measure the extent for which insoluble manganese oxide powder will pre-oxidize ascorbic acid in a phosphate buffered saline solution. This technique to reduce electroactive interferent species has recently been reported to be useful for enzyme-based electrochemical sensors. Under the conditions studied, it was found that manganese oxide reduces both hydrogen peroxide and ascorbic acid to 20.6% and 27.2% of their original signal strength respectively. With another 4 minutes of exposure to the oxide, signals due to hydrogen peroxide and ascorbic acid dropped to 9.0% and 5.0%, respectively.