期刊
LANGMUIR
卷 27, 期 5, 页码 1770-1777出版社
AMER CHEMICAL SOC
DOI: 10.1021/la102613f
关键词
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资金
- Department of Education [P200A040206]
- NSF [DMR-0804960]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0804960] Funding Source: National Science Foundation
A variety of rapid biomolecular assays under development rely on the selective adsorption of single-stranded DNA onto unfunctionalized, negatively charged, citrate-stabilized gold nanoparticles. We investigate the adsorption mechanism with a study of the binding kinetics and find strong evidence for the dominance of hydrophobic effects including linear compensation between the activation energy and the natural log of the Arrhenius prefactor and the correlation of the adsorption rate in the presence of various salts with the Hofmeister series. These results explain the selectivity for single-stranded over double-stranded DNA adsorption and contradict previous work citing an electrostatic DLVO-like mechanism. Our understanding should facilitate improvements to the selective-adsorption-based assays and, more generally, contribute to the understanding of interactions between like-charged species in aqueous solution.
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