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An optimized quantum dot-ligand system for biosensing applications: Evaluation as a glucose biosensor

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Title An optimized quantum dot-ligand system for biosensing applications: Evaluation as a glucose biosensor
 
Creator SARAN, AD
SADAWANA, MM
SRIVASTAVA, R
BELLARE, JR
 
Subject NANOPARTICLE FILMS
NANOCRYSTALS
MICROEMULSION
CDSE
OLIGONUCLEOTIDES
HYBRIDIZATION
CONJUGATION
ELECTRODES
OXIDASE
PROBES
Quantum dots
Optimization
Glucose
Glucose Oxidase
Biosensor
Microemulsion
 
Description A highly active quantum dot (QD)-ligand system is proposed for biosensing applications based on a novel optimization technique. The optimization is here applied to nine QD-ligand combinations, made out of three core-shell QDs (CdSe-CdS, CdSe-ZnS and CdS-ZnS) and three mercaptothiol ligands (mercaptoacetic acid, mercaptopropionic acid and glutathione). The nine QD-ligand systems are synthesized by the microemulsion extraction technique (published earlier by our group), at room temperature. The optimization parameters are the three critical properties relevant to glucose biosensing; Sensitivity to H(2)O(2) concentration, Initial enzyme activity and Stability of enzyme activity over four weeks. A scaling factor, Performance Index (PI), is modeled here for quantitative comparison between the nine systems. The optimized QD-ligand system, conjugated with Glucose Oxidase (OQLG), is evaluated for Michaelis-Menten kinetics. The Michaelis constant K(m) is evaluated to be 0.28 mM, indicating very high activity towards glucose. The OQLG system is then calibrated with known glucose concentrations to give a linear relationship between relative fluorescence intensity and glucose concentration. The linear model developed is then employed for estimating glucose levels in ten unknown blood (plasma) samples. The proposed optimization technique is quite generic and can be extended to other ligands too. The resultant OQLG system seems to be a promising platform for devising a novel Integrated Multi-analyte Nanobiosensor. (C) 2011 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2012-06-26T06:29:20Z
2012-06-26T06:29:20Z
2011
 
Type Article
 
Identifier COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,384(1-3)393-400
0927-7757
http://dx.doi.org/10.1016/j.colsurfa.2011.04.022
http://dspace.library.iitb.ac.in/jspui/handle/100/14039
 
Language English