1. Department of Hunan Provincial Key Lab of Dark Tea and Jin-hua, Hunan City University , Yiyang City , Hunan Province, 413000 , China
2. Yiyang Guan-Longyu Dark Tea Development Co., Ltd , Yiyang City , Hunan Province, 413000 , China
3. Department of Hunan Provincial Key Lab of Dark Tea and Jin-hua, Hunan City University , No. 518 Yingbin Road , Yiyang City , Hunan Province, 413000 , China