Dual-Stage DNA Sensing: Recognition and Detection

详细信息    查看全文

• 作者：T. Garca ; E. Casero ; M. Revenga-Parra ; F. Pariente ; E. Lorenzo
• 刊名：Analytical Chemistry
• 出版年：2008
• 出版时间：December 15, 2008
• 年：2008
• 卷：80
• 期：24
• 页码：9443-9449
• 全文大小：208K
• 年卷期：v.80,no.24(December 15, 2008)
• ISSN：1520-6882

文摘

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(NH₃)₅L]p>2+p>, 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.