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Mediator-free microfluidics biosensor based on titania–zirconia nanocomposite for urea detection

2012; Royal Society of Chemistry; Volume: 3; Issue: 1 Linguagem: Inglês

10.1039/c2ra21461j

2046-2069

Saurabh Srivastava, Md. Azahar Ali, Pratima R. Solanki, P.M. Chavhan, Manoj Kumar Pandey, Ashok Mulchandani, Anchal Srivastava, Bansi D. Malhotra,

Electrochemical sensors and biosensors

Urease (Urs) and glutamate dehydrogenase (GLDH) co-immobilized onto titania–zirconia (TiO2–ZrO2) nanocomposite and integrated with microfluidics mediator-free sensor have been utilized for urea detection. The PDMS microchannels have been sealed with a glass substrate comprising of reference (Ag/AgCl), counter (ITO) and working (Urs-GLDH/TiO2-ZrO2/ITO) electrodes. This mediator-free microfluidics urea sensor shows linearity as 5–100 mg/dL with improved sensitivity as 2.74 μA [Log mM]−1 cm−2 and detection limit of 0.07 mg/dl (0.44 mM) using 3σb/m criteria. The Reynolds number has been found to be as 0.166, indicating that fluid flow is completely laminar, controllable and the pressure drop across the microchannels is found to be as 3.5 × 103 Pa.