Nanostructured fluorescent particles for glucose sensing
Conference Paper
Overview
Research
Identity
Additional Document Info
Other
View All
Overview
abstract
Self-assembled thin films containing embedded enzymes and fluorescent indicators are being developed for use as highly specific glucose biosensors. The sensors are fabricated using electrostatic Layer-by-Layer (LBL) adsorption to create oxygen-sensitive (Ruthenium-based) layers, the fluorescent intensity of which responds to changes in local oxygen levels. Oxygen is consumed locally by the reaction between glucose oxidase (GOx) molecules and glucose. Latex panicles serve as the templates for our sensors and fabrication is carried out through the alternate adsorption of multiple levels of {GOx/polycation} and {Ruthenium-polycation/polyanion} bilayers. Additional fluorescence layers as well as fluorescent latex are being considered as internal intensity references to allow ratiometric monitoring. Films adsorbed to the nanoparticle templates are being studied to understand the fundamental chemical and optical properties, including enzymatic activity, spectral shape and emission intensity. Enzymatic activity is retained and stability is improved after adsorption, and increased surface area afforded by the panicles allows use of increased numbers of molecules. Fluorescence is also maintained, though blue shifts are observed in emission spectra, and indicator activity remains. In vitro characterization studies demonstrate the feasibility of the panicles as glucose biosensors, and future work will aim to optimize the response for neural monitoring.
name of conference
Optical Diagnostics and Sensing of Biological Fluids and Glucose and Cholesterol Monitoring II
