Study on the interaction of CdTe quantum dots with coumaric acid and caffeic acid based on fluorescence reversible tune

被引：34

作者：

Fan, Xiaoqing ^{[1
]}

Liu, Shaopu ^{[1
]}

He, Youqiu ^{[1
]}

机构：

[1] Southwest Univ, Sch Chem & Chem Engn, Chongqing 400715, Peoples R China

来源：

COLLOIDS AND SURFACES B-BIOINTERFACES | 2011年 / 88卷 / 01期

基金：

中国国家自然科学基金;

关键词：

CdTe quantum dots; Coumaric acid; Caffeic acid; Bovine serum albumin; HUMAN SERUM-ALBUMIN; DNA; NANOCRYSTALS; ORANGE; GREEN;

D O I：

10.1016/j.colsurfb.2011.05.029

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

This paper describes the synthesis of CdTe quantum dots (QDs) together capped by glutathione and thioglycolic acid (GSH and TGA) in aqueous solution. The narrow photoluminescence (fwhm <= 40 nm) CdTe QDs, whose emission spans most of the visible spectrum from green through red, has a quantum yield (QY) of 68% at room temperature. GSH/TGA-CdTe QDs are characterized by various experimental techniques such as optical absorption, photoluminescence and AFM measurements. Coumaric acid and caffeic acid is able to quench the fluorescence of GSH/TGA-CdTe QDs, and the fluorescence intensity is linearly proportional to the concentration of quenchers. The addition of bovine serum albumin (BSA) restores the fluorescence intensity of GSH/TGA-CdTe QDs-coumaric acid system and GSH/TGA-CdTe QDs-caffeic acid system. The fluorescence recovery was due to the interaction of BSA with coumaric acid and caffeic acid, leading to the freeing of the GSH/TGA-CdTe QDs. The fluorescence quenching mechanism of GSH/TGA-CdTe QDs was discussed. The binding constant and thermodynamics parameters of BSA-coumaric acid and BSA-caffeic acid during the binding process were calculated in the paper. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：23 / 30

页数：8

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