Immobilization of DNA on 11-mercaptoundecanoic acid-modified gold (111) surface for atomic force microscopy imaging
✍ Scribed by Yonghai Song; Zhuang Li; Zhiguo Liu; Gang Wei; Li Wang; Lanlan Sun
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 333 KB
- Volume
- 68
- Category
- Article
- ISSN
- 1059-910X
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✦ Synopsis
Abstract
Immobilized DNA on preformed 11‐mercaptoundecanoic acids (MUDA) self‐assembled monolayers (SAMs) on a gold (111) surface was bound by a divalent cation bridges was imaged by atomic force microscopy (AFM). The DNA immobilization was attributed to the formation of ionic bridges between the carboxylate groups of MUDA and the phosphate groups of DNA. AFM images revealed that DNA molecules could be immobilized strongly enough to permit stable and reproducible imaging. The effect of different bridge cations, such as Mg^2+^, Zn^2+^ and Cu^2+^, and the pH of DNA assembled solution on immobilization and conformation of DNA was studied. Plasmid DNA pBR 322/Pst I molecules were straightened by using a molecular combing technique on the MUDA surface. Microsc. Res. Tech. 68:59–64, 2005. © 2005 Wiley‐Liss, Inc.