1. Natural Products Research CenterChengdu Institute of BiologyChinese Academy of Sciences Chengdu Sichuan 610041 P. R. China
2. Department of Biomedical EngineeringSouthern University of Science and Technology No. 1088 Xueyuan Rd, Nanshan District Shenzhen Guangdong 518055 P. R. China
3. University of Chinese Academy of Sciences 19 A Yuquan Road, Shijingshan District Beijing 100049 P. R. China
4. Analytical & Testing CenterSichuan University Chengdu Sichuan 610064 P. R. China
5. Beijing Engineering Research Center for BioNanotechnology and CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyCAS Center for Excellence in NanoscienceNational Center for NanoScience and Technology No. 11 Zhongguancun Beiyitiao Beijing 100190 P. R. China