Citation: GAO Xiao-Ya, WEN Wen, SONG Zhi-Ying, ZHANG Ai-Ping, HAO Juan, HUANG Qian. Effects of Rare Earth Ions on the Interaction between Nano TiO₂ and Bovine Serum Albumin in the Presence of Ultrasound[J]. Acta Physico-Chimica Sinica, ;2012, 28(02): 470-478. doi: 10.3866/PKU.WHXB201112051 shu

Effects of Rare Earth Ions on the Interaction between Nano TiO₂ and Bovine Serum Albumin in the Presence of Ultrasound

1.
Department of Pharmacy, Shanxi Medical University, Taiyuan 030001, P. R. China

Received Date: 24 August 2011
Available Online: 5 December 2011
Fund Project: 山西省自然科学基金(2010011048-1) (2010011048-1)山西医科大学科技创新基金(01200806)资助项目 (01200806)

The effects of rare earth ions (La³⁺ , Gd³⁺ , Yb³⁺ ) on the interactions between nano TiO₂ and bovine serum albumin (BSA) were investigated in the presence of ultrasound. A combination of ultraviolet (UV) spectroscopy, fluorescence spectroscopy and sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) were used to characterize the interactions under simulated human physiological conditions. The endogenous fluorescence of BSA was quenched by nano TiO₂ in different systems. The mechanism of fluorescence quenching was static quenching with non-radiative energy transfer. SDS-PAGE revealed that the structure of BSA was not obviously destroyed upon binding with nano TiO₂ in different systems. Hydrogen bond and van der Waals interaction were deduced, on the basis of the thermodynamic parameters, to be the major driving forces. The binding distance of nano TiO₂ to BSA and the thermodynamic parameters were changed in the presence of rare earth ions. However, the number of binding sites and the type of intermolecular force remained essentially unchanged. This indicated that the interaction between nano TiO₂ and BSA was influenced by the rare earth ions, and that a lanthanide tetrad effect was observed. It is conjectured that rare earth ions participate in the nano TiO₂-BSA interaction process by means of“ionic bridge”formation or“appositional substitution”.
- Ultrasound,
- Nano TiO₂,
- Bovine serum albumin,
- Rare earth ion,
- Interaction
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effects of Rare Earth Ions on the Interaction between Nano TiO2 and Bovine Serum Albumin in the Presence of Ultrasound

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通讯作者: 陈斌, bchen63@163.com

Effects of Rare Earth Ions on the Interaction between Nano TiO₂ and Bovine Serum Albumin in the Presence of Ultrasound