Abstract
An amperometric biosensor based on hydrophilic 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF 4]) as nonaqueous electrolyte was developed. In order to improve the performance of the biosensor operating in hydrophilic nonaqueous solution, we chose the hydrophilic matrix – dimethylformamide (DMF) + chitosan organohydrogel entrapped hemoglobin (Hb) as the film modified electrode. The modified electrode possesses outstanding electrochemical response and catalytic activity in [bmim][BF 4] containing no (deliberately added) water. The resulting H 2O 2 biosensor shows an excellent performance with an apparent Michaelis–Menten constant ( K m app ) up to 0.68 mM and a detect limit of 1.2 × 10 −4 M but a relative long response time (40 s). Furthermore, we compared the temperature effect on the current responses of the biosensor to H 2O 2 in ionic liquid (IL) and in aqueous buffer. A higher thermal stability was observed when the biosensor was operated in IL. The study can provide a feasible approach on developing new nonaqueous biosensor in actual detection.
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