1. Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan, China;
2. National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, Collaborative Innovation Centre of Utilisation of Functional Ingredients from Botanicals, Hunan Agricultural University, Changsha, Hunan, China;
3. College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan, China;
4. The Key Laboratory of Carcinogenesis of the Chinese Ministry of Health and the Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Cancer Research Institute, Central South University, Changsha, Hunan, China