Assertion: indicator electrode | /r/HasProperty | encapsulated by a gel film of enzyme
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text: Ion-selective electrode sensors have been classified according to the membrane type and include the following electrode classifications: (1) homogeneous crystalline membrane electrodes (e.g., LaF 3 for F−, Ag 2 S for Ag+ or S2 −, AgCl/Ag 2 S for Cl−); (2) heterogeneous crystalline membrane electrodes (e.g., silicone rubbers comprising crystalline powders such as LaF 3 , Ag 2 S, AgCl/Ag 2 S); (3) rigid noncrystalline membrane electrodes embodying silicate and chalcogenide glasses; (4) nonrigid noncrystalline electrodes employing plasticized polymer membranes incorporating neutral ionophores as receptor molecules; (5) sensitized electrodes such as carbon dioxide or ammonia ISEs separating a filling solution housing an immersed pH indicator electrode from the sample solution by a gas diffusion membrane, or enzyme-sensitized electrodes incorporating a pH indicator electrode encapsulated by a gel film of enzyme (e.g., glucose oxidase) for the selective detection of the analyte (e.g., glucose).