Development of a sandwich format, amperometric screen-printed uric acid biosensor for urine analysis

Pemberton, Roy; Kanyong, P.; Hart, John P.; Jackson, S. K.

Abstract

A screen-printed carbon electrode (SPCE) incorporating the electrocatalyst cobalt phthalocyanine (CoPC), fabricated using a water-based ink formulation, has been investigated as the base transducer for a uric acid biosensor. A sandwich biosensor was fabricated by first depositing cellulose acetate (CA) onto this transducer (CoPC-SPCE), followed by uricase (UOX) and finally a polycarbonate (PC) membrane; this device is designated PC-UOX-CA-CoPC-SPCE. This biosensor was used in conjunction with chronoamperometry to optimize the conditions for the analysis of urine: temperature, 35 °C; buffer, pH 9.2; ionic strength, 50 mM; uricase, 0.6 U; incubation time, 180 s. The proposed biosensor was applied to urine from a healthy subject. The precision determined on unspiked urine (n = 6) was 5.82%. Urine was fortified with 0.225 mM UA, and the resulting precision and recovery were 4.21 and 97.3%, respectively. The linear working range of the biosensor was found to be 0.015 to 0.25 mM (the former represents the detection limit), and the sensitivity was calculated to be 2.10 μA/mM. © 2012 Elsevier Inc. All rights reserved.

• Journal Article Type: Article
• Publication Date: Sep 1, 2012
• Journal: Analytical Biochemistry
• Print ISSN: 0003-2697
• Publisher: Elsevier Masson
• Peer Reviewed: Peer Reviewed
• Volume: 428
• Issue: 1
• Pages: 39-43
• DOI: https://doi.org/10.1016/j.ab.2012.05.027
• Keywords: uricase, uric acid, hydrogen peroxide, cellulose acetate, cyclic voltammetry, chronoamperometry
• Public URL: https://uwe-repository.worktribe.com/output/954069
• Publisher URL: http://dx.doi.org/10.1016/j.ab.2012.05.027