期刊
LANGMUIR
卷 23, 期 4, 页码 2078-2082出版社
AMER CHEMICAL SOC
DOI: 10.1021/la062839j
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资金
- Medical Research Council [G0200629] Funding Source: Medline
- Engineering and Physical Sciences Research Council [EP/C510208/1] Funding Source: researchfish
- Medical Research Council [G0200629] Funding Source: researchfish
- MRC [G0200629] Funding Source: UKRI
Reflection anisotropy spectroscopy (RAS) was used to investigate the adsorption of single-stranded (ss-) and double-stranded (ds-) calf thymus DNA on Au(110) in an electrochemical cell. Both types of DNA form ordered structures for electrode potentials in the range from +0.6 to -0.4 V. Both types of DNA desorb at -0.6 V and may start desorbing at lower negative potentials. When adsorbed at +0.6 V, both forms give rise to a similar RAS signal and adsorb through the phosphate groups. As the potential is reduced, the RAS intensity observed from ss-DNA increases to roughly twice that observed from ds-DNA, a result that is interpreted as due to a change in the adsorption of the ss-DNA from sites involving the phosphate groups to sites involving the bases.
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