Authors: Julie M Goddard David Erickson
Publish Date: 2009/03/12
Volume: 394, Issue: 2, Pages: 469-
Abstract
We have evaluated five bioconjugation chemistries for immobilizing DNA onto silicon substrates for microfluidic biosensing applications Conjugation by organosilanes is compared with linkage by carbonyldiimidazole CDI activation of silanol groups and utilization of dendrimers Chemistries were compared in terms of immobilization and hybridization density stability under microfluidic flowinduced shear stress and stability after extended storage in aqueous solutions Conjugation by dendrimer tether provided the greatest hybridization efficiency however conjugation by aminosilane treated with glutaraldehyde yielded the greatest immobilization and hybridization densities as well as enhanced stability to both shear stress and extended storage in an aqueous environment Direct linkage by CDI activation provided sufficient immobilization and hybridization density and represents a novel DNA bioconjugation strategy Although these chemistries were evaluated for use in microfluidic biosensors the results provide meaningful insight to a number of nanobiotechnology applications for which microfluidic devices require surface biofunctionalization for example vascular prostheses and implanted devicesSupport for this work was provided by the National Institutes of HealthNational Institute of Biomedical Imaging and Bioengineering NIHNIBIB under grant number R21EB007031 This work made use of STC shared experimental facilities supported by the National Science Foundation under Agreement No ECS9876771 The authors gratefully acknowledge Dr Sam Nugen and Prof Antje Baeumner for technical assistance in determining hybridization conditions and Sudeep Mandal for preparation of PDMS master
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