3D Hydrogen Titanate Nanotubes on Ti Foil: A Carrier for Enzymatic Glucose Biosensor Glucose oxidase (GOx) based biosensors are commercialized and marketed for the high selectivity of GOx. Incorporation nanomaterials with GOx can increase the sensitivity performance. In this work, an enzyme glucose biosensor based on nanotubes was fabricated. By using Ti foil as a carrier, hydrogen titanate nanotubes (HTNTs), which present fine 3D structure with vast pores, were fabricated insitu by the hydrothermal treatment. The multilayer nanotubes are openended with a diameter of 10 nm. Then glucose oxidase (GOx) was loaded on the nanotubes by crosslinking to form an electrode of the amperometric glucose biosensor (GOxHTNTsTi electrode). The fabricated GOxHTNTsTi electrode had a linear response to 1xe2x80x9310 mM glucose, and the response time was 1.5 s. The sensitivity of the biosensor was 1.541 xcexbcAxc2xb7mM1xc2xb7cm2, and the detection limit (SN  3) was 59 xcexbcM. Obtained results indicate that the insitu fabrication and unique 3D structure of GOxHTNTsTi electrode are beneficial for its sensitivity.

A LowCost Paper Glucose Sensor with Molecularly Imprinted Polyaniline Electrode For the hundreds of millions of worldwide diabetic patients, glucose test strips are the most important and commonly used tool for monitoring blood glucose levels. Commercial test strips use glucose oxidases as recognition agents, which increases the cost and reduces the durability of test strips. To lower the cost of glucose sensors, we developed a paperbased electrical sensor with molecularly imprinted glucose recognition sites and demonstrated the determination of various glucose concentrations in bovine blood solutions. The sensing electrode is integrated with molecular recognition sites in the conductive polymer. A calibration graph as a function of glucose concentration in aqueous solution was acquired and matched with a correlation coefficient of 0.989. We also demonstrated the determination of the added glucose concentrations ranging from 2.2 to 11.1 mM in bovine blood samples with a linear correlation coefficient of 0.984. This nonenzymatic glucose sensor has the potential to reduce the health care cost of test strips as well as make glucose sensor test strips more accessible to underserved communities.