title: Dual-stage DNA sensing: recognition and detection.
abstract: Selective polynucleotide recognition and detection based on a dual-stage method are described. The method involves the development of a recognition surface based on gold nanoparticles modified with a thiolated capture probe able to hybridize with its complementary sequence (target). After hybridization, this sensing surface is removed from the solution and electrodeposited on an electrode surface. The detection of the hybridization event is achieved using the complex [Ru(NH(3))(5)L](2+), were L is [3-(2-phenanthren-9-yl-vinyl)-pyridine], as electrochemical indicator. This complex binds to double strand DNA more efficiently than to single stranded DNA. The advantage of this dual-stage DNA sensing method is the high selectivity derived from the separation of the hybridization event (occurring on one surface) from the detection step (on a different surface), enabling the analysis of long target DNAs, which is usually the case in real DNA sequence analysis. In addition, this approach not only quantifies pmol of a complementary target sequence but also is sensitive to the presence of a single mismatch and its position in the sequence.
authors.affiliation: Departamento de Química Analítica y Análisis Instrumental, Universidad Autónoma de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain.
authors.forename: T
authors.initials: T
authors.lastname: García
authors.forename: E
authors.initials: E
authors.lastname: Casero
authors.forename: M
authors.initials: M
authors.lastname: Revenga-Parra
authors.forename: F
authors.initials: F
authors.lastname: Pariente
authors.forename: E
authors.initials: E
authors.lastname: Lorenzo
mesh_terms: D015374:Biosensing Techniques; D004247:DNA / Q000032:analysis* / Q000235:genetics*; D055664:Electrochemical Techniques; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D053758:Nanoparticles; D009693:Nucleic Acid Hybridization; D009942:Organometallic Compounds / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; C527540:ruthenium (3-(2-phenanthren-9-yl-vinyl)-pyridine); D006046:Gold; D004247:DNA