* Corresponding authors

^a Department of Chemistry, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
E-mail: hwu@faculty.nsysu.edu.tw
Fax: +886-7-525-3909

^b Department of Chemistry, Assuit University, Assuit 71515, Egypt

^c School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 807, Taiwan

^d Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan

^e Doctoral Degree Program in Marine Biotechnology, National Sun Yat-Sen University and Academia Sinica, Kaohsiung 80424, Taiwan

^f Institute of Medical Science and Technology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan