We gratefully acknowledge the financial support provided by the Nature Science Foundation of Science and Technology Department of Hunan Province ( 2013WK2008 ), Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan ( 2014 207 ) and the project of applied basic research base of Hunan P. R. China ( The Dark Tea Fermentation and Extraction Technology of its Functional Components , 2014HCKF01 ).