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1,2,3,4,6-Pentagalloyl glucose
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1,2,3,4,6-Pentagalloyl glucose is the pentahydroxy gallic acid ester of glucose. It is the common precursor of gallotannins and the related ellagitannins.
Pentagalloyl glucose can precipitate proteins〔(Mechanisms of protein precipitation for two tannins, pentagalloyl glucose and epicatechin16 (4→8) catechin (procyanidin). Hagerman A. E., Rice M. E. and Ritchard N. T., Journal of agricultural and food chemistry, 1998, vol. 46, no7, pp. 2590-2595 )〕 including human salivary α-amylase.〔(Evidence for pentagalloyl glucose binding to human salivary α-amylase through aromatic amino acid residues. Gyöngyi Gyémánt, Ágnes Zajácz, Bálint Bécsi, Chandran Ragunath, Narayanan Ramasubbu, Ferenc Erdődi, Gyula Batta and Lili Kandra, Biochimica et Biophysica Acta (BBA) - Proteins & Proteomics, Volume 1794, Issue 2, February 2009, pp. 291-296 )〕
It may also be used in radioprotection.
== Natural occurrence ==
1,2,3,4,6-Pentagalloyl glucose can be found in ''Punica granatum'' (pomegranate), ''Elaeocarpus sylvestris'',〔 ''Rhus typhina'' (Staghorn sumac), and ''Paeonia suffruticosa'' (Tree Peony).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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