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Journal of Nanomaterials
Volume 2015 (2015), Article ID 540247, 8 pages
http://dx.doi.org/10.1155/2015/540247
Research Article

The Comparative PDT Experiment of the Inactivation of HL60 on Modified TiO2 Nanoparticles

1Laboratory of Quantum Information Technology, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China
2School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China

Received 24 February 2015; Revised 24 May 2015; Accepted 10 June 2015

Academic Editor: Paulo Cesar Morais

Copyright © 2015 Kaiqi Lu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Four samples of modified titanium dioxide (TiO2), Fe/TiO2 (2 wt%), Fe/TiO2 (5 wt%), and 5-ALA/TiO2, were experimented in photodynamic therapy (PDT) on leukemia cells HL60, performing promising photocatalytic inactivation effect. Fe/TiO2 and 5-ALA/TiO2 were synthesized in methods of precipitation and ultrasonic methods, respectively. X-ray diffraction spectra and UV-Vis spectra were studied for the samples’ crystalline phase and redshift of absorption peak. Further, FTIR spectra and Raman spectra were obtained to examine the combination of 5-aminolevulinic (5-ALA) and TiO2 nanoparticles. The toxicity of these four kinds of nanoparticles was studied through darkroom experiments. And based on the concentration which caused the same toxic effect (90%) on HL60, PDT experiments of TiO2, Fe/TiO2 (2%), Fe/TiO2 (5%), and ALA/TiO2 were done, resulting in the fact that the photokilling efficiency was 69.7%, 71.6%, 72%, and 80.6%, respectively. Scanning electron microscope (SEM) images of the samples were also taken to study the morphology of HL60 cells before and after PDT, resulting in the fact the activation of the modified TiO2 from PDT was the main cause of cell apoptosis.