Author: Lian, S. H. ; Jiang, S. P. ; Ding, Y. M. ; Zhang, J. R. ; Shen, H. G. ; Liu, S. H. ; Chen, J. H. ; Hui, L. K. ; Zhang, W.
The mechanism of photosensitization of human stomach tumor cells and HeLa cells by HPD was studied by using either pulsed or continuous-wave (CW) laser radiation.HPD had a marked photosensitized killing effect on cancer cells and results were similar for pulsed and CW laser irradiationThe results indicated that singlet O is the main mechanism of HPD photosensitization.The energy levels of HPD and HP were also calculated and correlated with the photodynamic reaction process.