Detection of Pb2+ in Aqueous Solution by Using a DNA-modified Microcantilever.
Anal Sci
; 32(10): 1065-1069, 2016.
Article
en En
| MEDLINE
| ID: mdl-27725605
ABSTRACT
We developed a novel Pb2+-sensor based on a microcantilever that was modified with a specific Pb2+-dependent DNAzyme molecule. This microcantilever sensor could detect Pb2+ sensitively and selectively in an aqueous solution. Upon complexation with Pb2+, the DNAzyme duplex unwinded and formed a G-quadruplex conformation, which led to an increase of repulsion between the DNAzyme molecules and a subsequent bending of the microcantilever. This microcantilever sensor could be regenerated, flowing through a strong Pb2+ chelator, 1,4,7,10-tetraazacyclododecane- 1,4,7,10-tetraacetic acid. The detection limit of the microcantilever sensor for Pb2+ ions is as low as 10-8 M. The microcantilever sensor also exhibited a high selectivity to Pb2+ over other metal ions such as Mg2+, Fe3+, Zn2+, Ca2+, and Cd2+.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Contaminantes Químicos del Agua
/
Técnicas Biosensibles
/
ADN Catalítico
/
G-Cuádruplex
/
Plomo
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
Anal Sci
Año:
2016
Tipo del documento:
Article