1. Key Laboratory of Tea Science of Ministry of Education and Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Utilization; Hunan Agricultural University; Hunan 410128 People's Republic of China
2. National Research Center of Engineering and Technology; Utilization of Botanical Functional Ingredients; Hunan 410128 People's Republic of China
3. Department of Chemistry; Tsinghua University and Key Laboratory of Biological Organic Phosphorus and Chemical Biology of Ministry of Education; Beijing 100084 People's Republic of China
4. AB Sciex; Asia Pacific Application Support Center; Shanghai 200233 People's Republic of China