4Coxon D.T.et al..Theaflavic and epitheeflavic acids[M].Terahedron letters,1970,60:5247-5250.
5Collier P.D.et al..The theaflavins of black tea[M].Tetrahedron,1973,29,125-142.
6Nonaka G.J.et al..Tannins and related compounds XXXVI,isolation and structures of theaflagallins,New red pigments from blalk tea[J].Chen.Pharm.Bull,1986,34(1):61-65.
7Bailey R.G.et al..The chemical oxidation of catachins and other phenolics:A study of the formation of black tea pigments[J].Sci.Food Agric.,1993,63,455-464.
8Wan Xiaochun et al..A new type of tea pigment-from the chemieal oxidation of epicatechin gallate and isolated from tea[J].J.Sci.Food Agric.,1997,74.401-408.
