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. 2023 Aug 9;13(8):798. doi: 10.3390/bios13080798

Figure 7.

Figure 7

(A) Typical DPV results for modified and unmodified (bare) platinum electrodes immersed in a solution of 0.25 mM mixture of HXAN, XAN, and UA (10 mM PBS; pH 7) that illustrate extreme blocking behavior of MPC-doped HMTES xerogel (no XOx) with and without the PU capping layer. (B) Amperometric I-t curves of platinum electrodes in PBS (10 mM; pH 7) held at +0.3 V and modified with SWCNT-COOH (Nafion) and HMTES xerogels with and without PU capping layers, along with platinum electrodes modified with SWCNT-COOH (Nafion) with and without PU capping layers (i.e., no HMTES xerogels) during 100 µL injection of 40 mM XAN at 1200 s and 100 µL injection of CAT enzyme (10 mg/mL) at 2100 s. (C) SWV results over time before (dashed trace) and after (solid traces) injection of XAN (200 µM) at platinum electrodes modified with SWCNT-COOHs (Nafion) and HMTES xerogels (with XOx) with and without (inset) the PU capping layer. Note: In terms of time, a typical SWV scan was ~10 s.