Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
595481 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2010 | 5 Pages |
Abstract
Thioglycolic acid (TGA) capped CdTe quantum dots (QDs) with the diameter of 2-3 nm were synthesized. The interaction between CdTe QDs and chymotrypsin (chy) was investigated by ultraviolet-visible (UV-vis) absorption, fluorescence and resonance Rayleigh scattering (RRS) spectroscopy. Under pH 7.2, CdTe QDs effectively quenched the intrinsic fluorescence of chy via static quenching. The binding constants for the formation of a complex between CdTe QDs and chy were 2.85, 2.58, 2.48 Ã 103 Mâ1 at 293, 298 and 303 K, respectively. ÎS° (49.72 kJ molâ1) and ÎH° (â4.61 kJ molâ1) indicated that electrostatic attraction was the dominant intermolecular forces in stabilizing the complex. The interaction between CdTe QDs and chy lead to the remarkable enhancement of RRS and the enchantments were in proportional to the concentration of chy in a certain range. The reasons for the enhancement of RRS were discussed. The experimental results showed that chy molecules have a relatively high affinity with CdTe QDs.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
Juanjuan Peng, Shaopu Liu, Shuguang Yan, Xiaoqing Fan, Youqiu He,