Flavonoids in translucent bracts of the Himalayan Rheum nobile (Polygonaceae) as ultraviolet shields

@article{Iwashina2004FlavonoidsIT,
  title={Flavonoids in translucent bracts of the Himalayan Rheum nobile (Polygonaceae) as ultraviolet shields},
  author={Tsukasa Iwashina and Yuji Omori and Jun-ichi Kitajima and Shinobu Akiyama and Toshisada Suzuki and Hideaki Ohba},
  journal={Journal of Plant Research},
  year={2004},
  volume={117},
  pages={101-107}
}
UV-absorbing substances were isolated from the translucent bracts of Rheum nobile, which grows in the alpine zone of the eastern Himalayas. Nine kinds of the UV-absorbing substances were found by high performance liquid chromatography (HPLC) and paper chromatography (PC) surveys. All of the five major compounds are flavonoids, and were identified as quercetin 3-O-glucoside, quercetin 3-O-galactoside, quercetin 3-O-rutinoside, quercetin 3-O-arabinoside and quercetin 3-O-[6″-(3-hydroxy-3… 
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