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Fast responsive crystalline colloidal array photonic crystal glucose sensors

Ben-Moshe, M and Alexeev, VL and Asher, SA (2006) Fast responsive crystalline colloidal array photonic crystal glucose sensors. Analytical Chemistry, 78 (14). 5149 - 5157. ISSN 0003-2700

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We developed new photonic crystal polymerized crystalline colloidal array (PCCA) glucose sensing materials, which operate on the basis of formation of cross-links in the hydrogel. These materials are composed of hydrogels that embed an array of ∼100-nm-diameter monodisperse polystyrene colloids that Bragg diffract light in the visible spectral region. The hydrogels change volume as the glucose concentration varies. This changes the lattice spacing, which changes the wavelength of the diffracted light. In contrast to our previous glucose sensing photonic crystal materials, we no longer require Na+ chelating agents. These photonic crystal materials are being designed for use in glucose sensing contact lens for people with diabetes mellitus. We describe methods to speed up the response kinetics of these PCCA sensing materials. Rapid-response kinetics is achieved by controlling the elasticity and the hydrophilic-hydrophobic balance of the hydrogel system. A more hydrophobic hydrogel composition is obtained by copolymerizing n-hexylacrylate into an acrylamide-bisacrylamide hydrogel. The response rate significantly increases to where it fully responds within 90 s to the average glucose concentrations found in blood (5 mM) and within 300 s to the average glucose concentrations found in tear fluid (0.15 mM). We find unusual temperature-dependent kinetics, which derive from glucose mutarotation in solution. It is shown that α-D-glucose is the glucose anomer binding to the boronic acid derivative. Care must be taken in any glucose determination to ensure that the glucose mutarotation equilibrium has been established. We have demonstrated that the sensor is responsive to ∼0.15 mM glucose concentrations in artificial tear fluid solution. © 2006 American Chemical Society.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Ben-Moshe, M
Alexeev, VL
Asher, SAasher@pitt.eduASHER
Date: 15 July 2006
Date Type: Publication
Journal or Publication Title: Analytical Chemistry
Volume: 78
Number: 14
Page Range: 5149 - 5157
DOI or Unique Handle: 10.1021/ac060643i
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0003-2700
MeSH Headings: Biosensing Techniques--methods; Cross-Linking Reagents--chemistry; Crystallization; Disaccharides--chemistry; Glucose--analysis; Hydrogels--chemistry; Hydrophobic and Hydrophilic Interactions; Kinetics; Microarray Analysis--methods; Molecular Structure; Polymers--chemistry; Temperature; Time Factors
PubMed ID: 16841941
Date Deposited: 08 Feb 2013 21:14
Last Modified: 22 Jun 2021 13:55


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