Development of a methodology for reversible chemical modification of silicon surfaces with application in nanomechanical biosensors

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Biosensors and Bioelectronics
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Sato R.H.
Kosaka P.M.
Omori A.T.
Ferreira E.A.
Petri D.F.S.
Malvar O.
Dominguez C.M.
Pini V.
Ahumada O.
Tamayo J.
Calleja M.
Cunha R.L.O.R.
Fiorito P.A.
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© 2019 Elsevier B.V.Hypervalent tellurium compounds have a particular reactivity towards thiol compounds which are related to their biological properties. In this work, this property was assembled to tellurium-functionalized surfaces. These compounds were used as linkers in the immobilization process of thiolated biomolecules (such as DNA)on microcantilever surfaces. The telluride derivatives acted as reversible binding agents due to their redox properties, providing the regeneration of microcantilever surfaces and allowing their reuse for further biomolecules immobilizations, recycling the functional surface. Initially, we started from the synthesis of 4-((3-((4-methoxyphenyl)tellanyl)phenyl)amino)-4-oxobutanoic acid, a new compound, which was immobilized on a silicon surface. In nanomechanical systems, the detection involved a hybridization study of thiolated DNA sequences. Fluorescence microscopy technique was used to confirm the immobilization and removal of the telluride-DNA system and provided revealing results about the potentiality of applying redox properties to chalcogen derivatives at surfaces.
Assuntos Scopus
Biomolecules immobilization , Chalcogens , Functionalized surfaces , Micro-cantilevers , Nanomechanical , Nanomechanical systems , Reversible immobilization , Thiolated biomolecules , Base Sequence , Biosensing Techniques , DNA , Nanostructures , Nucleic Acid Hybridization , Silicon , Sulfhydryl Compounds , Surface Properties , Tellurium
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