報告題目:Interfacing DNA with metal ions, metal oxides, and metal nanoparticles
報 告 人:劉玨文 副教授(加拿大滑鐵盧大學)
報告時間:2015年5月20日下午3:00
報告地點:化學樓二樓一號會議室
報告人簡介:
劉玨文,加拿大滑鐵盧大學化學系副教授,博士生導師。2000年畢業于中國科技大學化學系,獲得本科學位。2005年獲美國伊利諾伊大學(UIUC)化學系博士學位(導師Yi Lu教授),課題方向為脫氧核酸酶在金屬離子檢測中的應用。2005-2007年繼續在Dr. Yi Lu實驗室進行博士后工作。2007-2009年在美國新墨西哥大學和Sandia國家實驗室進行基于介孔氧化硅的藥物傳遞系統的博士后研究工作(導師 C. Jeffrey Brinker教授, 美國工程院院士)。從2009年起受聘于加拿大滑鐵盧大學。在過去六年內,獲得加拿大自然科學基金,加拿大創新基金,加拿大化學會Fred Beamish獎,安大略省青年研究者獎等多項研究資助。
近年來接收和發表期刊研究論文和書籍章節共計130余篇,其中Acc. Chem. Res. (1), Chem. Rev. (1), PNAS (2), J. Am. Chem. Soc. (18), Angew. Chem. Int. Ed. (5), Adv. Mater. (3), Anal. Chem. (13), 引用數達6000余次。其中引用超過100次的有20篇。擔任多個雜志的審稿工作。現主要從事核酸適配體,納米材料和軟物質的分析化學,物理化學,以及表面性質的研究。
報告簡介:
DNA is a polyanion with strong affinity towards metal containing species. We are interested in studying the interaction between DNA and metal for analytical applications. This talk will cover three aspects. 1) In vitro selection of metal-specific DNAzymes. DNAzymes are DNA-based catalysts and we focus on RNA-cleaving DNAzymes. Using lanthanide ions as cofactors, we isolated a suite of new DNAzymes that can selectively detect rare-earth metals. By using phosphorothioate modified DNAzymes, we developed new probes for a few toxic heavy metal ions. 2) The adsorption of DNA by various metal oxides were studied, where the phosphate backbone of DNA is shown to be critical for the adsorption reaction. Using fluorescently labeled DNA, highly sensitive detection of arsenate and hydrogen peroxide was achieved. 3) DNA adsorption by gold nanoparticles is studied as a function of salt concentration and pH. Based on this study, we developed an ultrasensitive method for functionalizing gold surface with DNA.