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(A) Amperometric I-t curves and (B) corresponding calibration curves during successive 1 μM injections of glucose at a Pt-Ir wire electrode modified with GOx-doped OTMS xerogel, undoped OTMS xerogel, polyphenol, polyurethane layer (50% HPU, 50% TPU), and epoxy cap both (a) with and (b) without a Pt-black under-layer. Solution: 60.0 mM PBS, pH = 7.4, μ = 155 mM. Note: The error bars represent standard error (n ≥ 4).
