000081196 001__ 81196
000081196 005__ 20180317094223.0
000081196 037__ $$aARTICLE
000081196 245__ $$aDesign, characterization, and one-point in vivo calibration of a subcutaneously implanted glucose electrode
000081196 269__ $$a1994
000081196 260__ $$c1994
000081196 336__ $$aJournal Articles
000081196 520__ $$aA 0.29-mm-diameter flexible electrode designed for subcutaneous in vivo amperometric monitoring of glucose is described. The electrode was designed to allow "one-point" in vivo calibration, i.e., to have zero output current at zero glucose concentration, even in the presence of other electroreactive species of serum or blood. A valid zero point, along with a measurement of the glucose concentration in a withdrawn sample of blood at which the current is known, defined the sensitivity in the linear response range. The electrode was four-layered, with the layers serially deposited within a 0.125-mm recess upon the tip of a polyimide-insulated 0.25-mm gold wire. The recessed structure reduced the sensitivity to movement and allowed, through control of the depth of the recess, control of the transport of glucose and thus the range of linearity. The recess contained the four polymeric layers, with a total mass less than 5 micrograms and no leachable components. The bottom glucose concentration-to-current transducing layer consisted of the enzyme "wiring" redox polymer poly[(vinylimidazole)Os(bipyridine)2Cl]+ , complexed with recombinant glucose oxidase and cross-linked with poly(ethylene glycol) diglycidyl ether, to form an electron-conducting hydrogel. The layer was overcoated with an electrically insulating layer of polyaziridine-cross-linked poly(allylamine), on which an immobilized interference-eliminating horseradish peroxidase based film was deposited. An outer biocompatible layer was formed by photo-cross-linking derivatized poly(ethylene oxide). The current output of a typical electrode at 10 mM glucose and at 37 degrees C was 35 nA, the apparent Km was 20 mM, and the 10-90% response time was approximately 1 min.(ABSTRACT TRUNCATED AT 250 WORDS) [on SciFinder (R)]
000081196 700__ $$aCsoregi, E.
000081196 700__ $$aQuinn, C. P.
000081196 700__ $$aSchmidtke, D. W.
000081196 700__ $$aLindquist, S. E.
000081196 700__ $$aPishko, M. V.
000081196 700__ $$aYe, L.
000081196 700__ $$aKatakis, I.
000081196 700__ $$0240350$$aHubbell, J. A.$$g141360
000081196 700__ $$aHeller, A.
000081196 773__ $$j66$$k19$$q3131-8$$tAnalytical chemistry
000081196 909CO $$ooai:infoscience.tind.io:81196$$particle
000081196 909C0 $$0252196$$pLMRP$$xU11032
000081196 937__ $$aLMRP-ARTICLE-1994-001
000081196 970__ $$a36/LMRP
000081196 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000081196 980__ $$aARTICLE