Document Detail


Thermodynamic Analysis of the Selectivity Enhancement Obtained by Using Smart Hydrogels That Are Zwitterionic When Detecting Glucose With Boronic Acid Moieties.
MedLine Citation:
PMID:  22190765     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Because the boronic acid moiety reversibly binds to sugar molecules and has low cytotoxicity, boronic acid-containing hydrogels are being used in a variety of implantable glucose sensors under development, including sensors based on optical, fluorescence, and swelling pressure measurements. However, some method of glucose selectivity enhancement is often necessary, because isolated boronic acid molecules have a binding constant with glucose that is some forty times smaller than their binding constant with fructose, the second most abundant sugar in the human body. In many cases, glucose selectivity enhancement is obtained by incorporating pendant tertiary amines into the hydrogel network, thereby giving rise to a hydrogel that is zwitterionic at physiological pH. However, the mechanism by which incorporation of tertiary amines confers selectivity enhancement is poorly understood. In order to clarify this mechanism, we use the osmotic deswelling technique to compare the thermodynamic interactions of glucose and fructose with a zwitterionic smart hydrogel containing boronic acid moieties. We also investigate the change in the structure of the hydrogel that occurs when it binds to glucose or to fructose using the technique of small angle neutron scattering.
Authors:
F Horkay; S H Cho; P Tathireddy; L Rieth; F Solzbacher; J Magda
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Sensors and actuators. B, Chemical     Volume:  160     ISSN:  0925-4005     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101149755     Medline TA:  Sens Actuators B Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1363-1371     Citation Subset:  -    
Affiliation:
Section on Tissue Biophysics and Biomimetics, Program on Pediatric Imaging and Tissue Sciences, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-5772 USA.
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MeSH Terms
Descriptor/Qualifier:
Grant Support
ID/Acronym/Agency:
R21 EB008571-01//NIBIB NIH HHS; R21 EB008571-02//NIBIB NIH HHS; R21 EB008571-03//NIBIB NIH HHS

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