Biosynthesis of gallotannins and ellagitannins

Gallotannins contain an additional 10-12 gallic acid moieties per molecule. This is effectively a continuation of the esterification reactions that resulted in the formation of pentagalloylglucose (3.99). The major 

and Rigsby, L. L., 1991, Structure and digestibility of tissues in normal and brown midrib pearl millet (Pennisetum glaucum), J. Sci. FoodAgric. 56 523-538. 

Akiyama, T., Magara, K., Matsumoto, Y., Meshitsuka, G., Ishizu, A., and Lundquist, K., 2000, Proof of the presence of racemic forms of arylglycerol-P-aryl ether structure in lignin studies on the stereo structure of lignin by ozonation, J. Wood Sci. 46 414-415. 

Albert, S., Delseny, M., and Devic, M., 1997, BANYULS, a novel negative regulator of flavonoid biosynthesis in the Arabidopsis seed coat, Plant J. 11 289-299. 

Anterola, A. M., and Lewis, N. G., 2002, Trends in lignin modification a compehensive analysis of the effects of genetic manipulations/ mutations on lignification and vascular integrity, Phytochem. 61 221-294. 

---