Title :
A flexible 1 mm catheter based binary amperometric lactate/oxygen detection system
Author :
Li Wang, D. ; Young, A.W. ; Heller, A.
Author_Institution :
Dept. of Chem. Eng., Texas Univ., Austin, TX, USA
Abstract :
The authors report on a miniature, flexible catheter based system, with lactate and oxygen sensors, connected to a small bipotentiostat. The lactate sensor is made of polished tips of an array of epoxy embedded carbon fibers. The oxygen sensor is Clark-type. The steady-state lactate electrooxidation current density was 0.3 mA cm/sup -2/ at 2 mM lactate concentration. The lactate sensitivity was 30 mA cm/sup -2/ M/sup -1/. The variation in lactate dependent current under N/sub 2/ and under air was only 2.6%. The oxygen electrode\´s current was not affected by lactate concentration. The 6"*3"*2", 5 oz, bipotentiostat developed for control and monitoring the electrodes has a linear response to current inputs over six orders of magnitude from 10 pA to 10 mu A.<>
Keywords :
biosensors; electrochemical analysis; gas sensors; organic compounds; oxygen; 1 mm; 10 pA to 10 muA; Ag-AgCl; Clark type sensor; N/sub 2/; O/sub 2/ sensor; Pt; air; amperometric detector; binary electrode; bipotentiostat; electrochemical analysis; epoxy embedded carbon fibers; flexible catheter; gas sensor; lactate electrode; lactate electrooxidation current density; lactate sensor; linear response; organic compounds; polished tips; Biomedical electrodes; Catheters; Chemical sensors; Microelectrodes; Oxygen; Platinum; Polyimides; Sensor arrays; Surface treatment; Wire;
Conference_Titel :
Solid-State Sensor and Actuator Workshop, 1992. 5th Technical Digest., IEEE
Conference_Location :
Hilton Head Island, SC, USA
Print_ISBN :
0-7803-0456-X
DOI :
10.1109/SOLSEN.1992.228314
