Sensors · 2019 · 65 citations · 27 references
EngineeringBioengineeringChemical EngineeringBiosensorsElectrochemistrySensorsElectrochemical BiosensorsElectrochemical SensorsEnzymatic BiosensorsEnzyme-based BiosensorsNanomaterial-based BiosensorsNanosensorsElectrochemical BiosensingGlucose BiosensorsGlucose OxidaseGlucose SensorsGold ElectrodesNanoparticlesVoltammetric BiosensorsVoltammetric Detection
In this work, an enzymatic sensor, based on a bionanocomposite film consisting of a polyelectrolyte complex (PEC) (Chitosan/kappa-carrageenan) doped with gold nanoparticles (AuNPs) encapsulating glucose oxidase (GOD) deposited on a gold electrode (Au) for glucose sensing, is described. Using the electrocatalytic synergy of AuNPs and GOD as a model of enzyme, the variation of the current (µA) as a function of the log of the glucose concentration (log [glucose]), shows three times higher sensitivity for the modified electrode (283.9) compared to that of the PEC/GOD modified electrode (93.7), with a detection limit of about 5 µM and a linearity range between 10 µM and 7 mM. The response of the PEC/AuNPs/GOD based biosensor also presents good reproducibility, stability, and negligible interfering effects from ascorbic acid, uric acid, urea, and creatinine. The applicability of the PEC/AuNPs/GOD based biosensor was tested in glucose-spiked saliva samples and acceptable recovery rates were obtained.
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Amanda J. Haes, Richard P. Van Duyne · Journal of the American Chemical Society · 2002 · 2K citations
Pepsin−Gold Colloid Conjugates: Preparation, Characterization, and Enzymatic Activity
Anand Gole, Chandravanu Dash, Vidya Ramakrishnan et al. · Langmuir · 2001 · 575 citations