C-prolinylquercetins from the yellow cocoon shell of the silkworm, Bombyx mori.
Two flavonoids containing the l-proline moiety, 6-C-[(2S,5S)-prolin-5-yl] quercetin (prolinalin A) and 6-C-[(2S,5R)-prolin-5-yl] quercetin (prolinalin B), were isolated from the cocoon shell of the silkworm, Bombyx mori. Their structural elucidation was achieved by application of acid hydrolysis and spectroscopic methods. These compounds were not found in the leaves of mulberry (Morus alba L.), the host plant of the silkworm, suggesting that the flavonoids are metabolites of the insect. This is the first time that flavonoids with an amino acid moiety have been found as naturally occurring compounds.
Hirayama
Chikara
C
National Institute of Agrobiological Sciences, 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan. hirayam@nias.affrc.go.jp
Ono
Hiroshi
H
Tamura
Yasumori
Y
Nakamura
Masatoshi
M
D000818:Animals; D012831:Bombyx / Q000737:chemistry* / Q000254:growth & development*; D003116:Color; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D011392:Proline / Q000737:chemistry*; D011794:Quercetin / Q000737:chemistry* / Q000302:isolation & purification
D011392:Proline; D011794:Quercetin