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Binding Behaviors of Tryptophan-containing Oligopeptides by b-Cyclodextrin-Coated Gold Nanoparticles
yu liu * #,Zhang Qian,Chen Yong,Li Xiaoyun
Department of Chemistry, Nankai University
*Correspondence author
#Submitted by
Subject:
Funding: 973计划项目,教育部博士点基金（No.2006CB932900,20050055004）
Opened online: 6 May 2008
Accepted by: none
Citation: yu liu,Zhang Qian,Chen Yong.Binding Behaviors of Tryptophan-containing Oligopeptides by b-Cyclodextrin-Coated Gold Nanoparticles[OL]. [ 6 May 2008] http://en.paper.edu.cn/en_releasepaper/content/21163
 
 
Three b-cyclodextrin derivatives were respectively chemisorbed onto the gold nanoparticles to give the b-cyclodextrin-coated gold nanoparticles, which were sufficiently characterized by 1H NMR, FT-IR, elemental analyses, ICP-AES and transmission electron microscopy (TEM). Spectrophotometric studies showed that these coated gold nanoparticles could efficiently enhance the fluorescence of tryptophan and tryptophan-containing oligopeptides through the selective binding of b-cyclodextrin cavities with the tryptophan groups attached on the surface of gold nuclei. Fluorescence titrations give the apparent association constants for the binding of coated gold nanoparticles with tryptophan and tryptophan-containing oligopeptides. The molecular binding ability and selectivity are discussed from the viewpoint of induced-fit effect between host and guest.
Keywords:Cyclodextrin; Gold nanoparticles; Oligopeptides; Tryptophan
 
 
 

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