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(a) CA responses of the SPE(W2)|CNT-ABTS|Nafion electrode to various Crn concentrations. (b) Calibration curve of the proposed Crn sensor in urine with known concentrations of 1.67, 11.55, 20.10, 31.22, 41.80 and 58.62 mg/dL, respectively. (c) Regression analysis of CCrn in five urine samples determined by TBA-25FR and SPE(W2)|CNT-ABTS|Nafion is shown in red; The deviation percentage in the CCrn values determined by TBA™-25FR and SPE(W2)|CNT-ABTS|Nafion electrode is shown in blue.
