1. National Institute of Metrology, Beijing 100029, China
2. Key Laboratory of Chemical Metrology and Applications on Nutrition and Health for State Market Regulation, Beijing 100029, China
3. Department of Chemistry, Tsinghua University, Beijing 100084, P.R. China
4. MOE Key Laboratory of Protein Sciences, School of Life Science, Tsinghua University, Beijing 100084, P.R. China
5. Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, Shandong Province 266000, China