Oh

(19) Epitheaflavic acid; R = H

(20) Epitheaflavic acid-3'-gallate; R = 3,4,5-trihydroxybenzoyl

Figure 7. Formation of theaflavic acids.

that occurs when tea infusions are allowed to stand. Poly-phenolic compounds in this molecular weight range are active complexing agents and are therefore likely to be present in combination with other substances. Flavonol glycosides have been shown to constitute one group of com pounds that appear as part of the thearubigin fraction as originally designated, but, as colorless compounds, they are not usefully regarded as such. New high-performance liquid chromatography (HPLC) techniques have allowed for the isolation of several other components of this mass.

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