title: Thermal desorption behavior and binding properties of DNA bases and nucleosides on gold.
abstract: A comparison of the binding of DNA bases (adenine, cytosine, guanine, and thymine) and nucleosides (2'deoxyadenosine, 2'deoxycytidine, 2'deoxyguanosine, and thymidine) to gold thin films is presented. Desorption of monolayer/submonolayer and multilayer films of the adsorbates on gold studied via temperature-programmed desorption (TPD) and reflection-absorption infrared (RAIR) spectroscopy reveals that there are major differences in the binding affinities of the different bases to gold, for example, thymine DeltaHdes = 111 +/- 2 kJ/mol compared to guanine DeltaHdes = 146 +/- 2 kJ/mol. The differences can be rationalized by molecular structures of the bases and their binding modes to gold surfaces deduced from IR data. Similar trends in desorption energies, shifted to lower desorption energy by more than 10 kJ/mol, are observed for deoxynucleoside layers on gold thin films.
authors.affiliation: Department of Chemistry and Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.
authors.forename: Linette M
authors.initials: LM
authors.lastname: Demers
authors.forename: Mattias
authors.initials: M
authors.lastname: Ostblom
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Nak-Han
authors.initials: NH
authors.lastname: Jang
authors.forename: Bo
authors.initials: B
authors.lastname: Liedberg
authors.forename: Chad A
authors.initials: CA
authors.lastname: Mirkin
mesh_terms: D000225:Adenine / Q000737:chemistry; D000327:Adsorption; D003596:Cytosine / Q000737:chemistry; D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D006046:Gold / Q000737:chemistry* / Q000378:metabolism; D006147:Guanine / Q000737:chemistry; D006358:Hot Temperature; D009705:Nucleosides / Q000737:chemistry* / Q000378:metabolism; D013055:Spectrophotometry, Infrared; D013499:Surface Properties; D013816:Thermodynamics; D013941:Thymine / Q000737:chemistry
chemical_list: D009705:Nucleosides; D006147:Guanine; D006046:Gold; D003596:Cytosine; D004247:DNA; D000225:Adenine; D013941:Thymine