title: Study on the interaction of CdTe quantum dots with coumaric acid and caffeic acid based on fluorescence reversible tune.
abstract: 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.
authors.affiliation: School of Chemistry and Chemical Engineering, Southwest University, Chongqing, China.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Fan
authors.forename: Shaopu
authors.initials: S
authors.lastname: Liu
authors.forename: Youqiu
authors.initials: Y
authors.lastname: He
mesh_terms: D000818:Animals; D002109:Caffeic Acids / Q000737:chemistry*; D002417:Cattle; D003373:Coumaric Acids / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D045663:Quantum Dots; D012710:Serum Albumin, Bovine / Q000737:chemistry
chemical_list: D002109:Caffeic Acids; D003373:Coumaric Acids; D012710:Serum Albumin, Bovine; C040048:caffeic acid