Simple Esters Occurrence and Detection

Gallic acid is almost invariably found in plant tissues in ester form. Various simple esters of gallic acid have been described from plant sources (Table 7.2.2, Table 7.2.3) and these metabolites are in many ways analogous to the hydroxycinnamoyl esters occurring in plants. These esters are thus formed by association with sugars. 

Quercetin-3-0-(6 -0-galloyl)-)5-D-glucoside Tellima grandiflora Saxifragaceae 10 

Digalloyl procyanidin B-2 monogalloyl procyanidin B2 Rhei rhizoma Polygonaceae 87 

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