Polygonum tinctorium

Isatis chinensis (Thunb.) Nakai, I. chinensis (Thunb.) Nakai var. graminifolia H. C. Fu Polygonum tinctorium Lour. 

Figure 9. Tryptanthrin and kaempferol, isolated from Polygonum tinctorium.

In 1992, Xia and Zenk could show in feeding studies with C-labelled indole and 3- C-labelled (S)-tryptophan on various plants, including Polygonum tinctorium, Indigofera tinctoria and Isatis tinctoria, that the metabolism does not involve tryptophan directly, but proceeded via indole. [16] In the biosynthesis of indoxyl, tryptophan is first degraded, by means of a tryptophanase, to indole, and this is then hydroxylated. [17] Finally, indoxyl binds to various sugars. 

Thereby indican (lH-indol-3-yl /l-(D)-glucoside) from Indigofera tinctoria), and respectively isatan A and B (liT-indol-3-yl 6 -0-malonyl-(D)-ribohex-3 -ulopyranoside and liT-indol-3-yl jS-(D)-ribohex-3 -ulopyranoside from Isatis tinctoria and Polygonum tinctorium), are all cleaved enzymatically by jS-glucosidases. [13,19]... 

Isatan A R Isatan B R = H Isatis tinctoria. Polygonum tinctorium)... 

Indican (3-hydroxyindole p-o-glucoside) (82) occurs mainly in the genera Indigofera (Fabaceae), Isatis (Brassica-ceae), and Polygonum (Polygonaceae). When L-[5- H]tryp-tophan was administered to young plants of Isatis tinctoria (woad) and Polygonum tinctorium, radioactively labeled indican was isolated (Maier et al., 1990). In the woad plant. 

Maier, W., B. Schumann, and D. Groger, Biosynthesis of indoxyl derivatives in Isatis tinctoria and Polygonum tinctorium. Phytochemistry, 29, 817-819 (1990). 

Occurs in Polygonum tinctorium. Ait., Isatis tincloria, Linn., and various Indigofera species. Nellies + 3HjO from H O. M.p. 57-8° (176-8° anhyd.). Hyd. by dil. HCl. 

Baphicacanthus cusia (Acanthaceae) [19], Calanthe aristurifera (Orchidaceae) [33], C. discolor [33], C. liukiuensis [35], C. reflexa [33], Isatis indigotica (Brassicaceae) [35], I. tinctoria [28], Polygonum tinctorium (Polygonaceae), [58], Strobilanthes cusia (Acanthaceae) [14], Wrightia tinctoria (Apocynaceae) [31]... 

H. (2011) FT-Raman spectroscopy - a rapid and reliable quantification protocol for the determination of natural indigo dye in Polygonum tinctorium. 

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