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Flavone C-glycosides from leaves of Oxalis triangularis.
J Agric Food Chem. 2005 Dec 28; 53(26):10057-60.JA

Abstract

The flavone C-glycosides luteolin 6-C-(2''-O-beta-xylopyranosyl-beta-glucopyranoside) (1), apigenin 6-C-(2''-O-alpha-rhamnopyranosyl-beta-glucopyranoside) (2), apigenin 6-C-(2''-O-beta-xylopyranosyl-beta-glucopyranoside) (3), apigenin 6-C-(2''-O-(6'''-(E)-caffeoylglucoside)-beta-glucopyranoside) (4), and apigenin 6-C-(2''-O-(6'''-(E)-p-coumaroylglucoside)-beta-glucopyranoside) (5) have been isolated from the purple leaves of Oxalis triangularis. Compound 4 is new, while 5 has previously been isolated from Cucumis sativus after treatment with silicon and infection with Sphaerotheca fuliginea. Signal duplication in the NMR spectra of 2, 4, and 5 revealed the presence of rotameric conformers, created by rotational hindrance at the C(sp3) -C(sp2) glucosyl-flavone linkage in these flavone C-glycosides.

Authors+Show Affiliations

Department of Chemistry, University of Bergen, Allégt. 41, N-5007 Bergen, Norway.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16366694

Citation

Rayyan, Saleh, et al. "Flavone C-glycosides From Leaves of Oxalis Triangularis." Journal of Agricultural and Food Chemistry, vol. 53, no. 26, 2005, pp. 10057-60.
Rayyan S, Fossen T, Andersen ØM. Flavone C-glycosides from leaves of Oxalis triangularis. J Agric Food Chem. 2005;53(26):10057-60.
Rayyan, S., Fossen, T., & Andersen, Ø. M. (2005). Flavone C-glycosides from leaves of Oxalis triangularis. Journal of Agricultural and Food Chemistry, 53(26), 10057-60.
Rayyan S, Fossen T, Andersen ØM. Flavone C-glycosides From Leaves of Oxalis Triangularis. J Agric Food Chem. 2005 Dec 28;53(26):10057-60. PubMed PMID: 16366694.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Flavone C-glycosides from leaves of Oxalis triangularis. AU - Rayyan,Saleh, AU - Fossen,Torgils, AU - Andersen,Øyvind M, PY - 2005/12/22/pubmed PY - 2006/2/4/medline PY - 2005/12/22/entrez SP - 10057 EP - 60 JF - Journal of agricultural and food chemistry JO - J Agric Food Chem VL - 53 IS - 26 N2 - The flavone C-glycosides luteolin 6-C-(2''-O-beta-xylopyranosyl-beta-glucopyranoside) (1), apigenin 6-C-(2''-O-alpha-rhamnopyranosyl-beta-glucopyranoside) (2), apigenin 6-C-(2''-O-beta-xylopyranosyl-beta-glucopyranoside) (3), apigenin 6-C-(2''-O-(6'''-(E)-caffeoylglucoside)-beta-glucopyranoside) (4), and apigenin 6-C-(2''-O-(6'''-(E)-p-coumaroylglucoside)-beta-glucopyranoside) (5) have been isolated from the purple leaves of Oxalis triangularis. Compound 4 is new, while 5 has previously been isolated from Cucumis sativus after treatment with silicon and infection with Sphaerotheca fuliginea. Signal duplication in the NMR spectra of 2, 4, and 5 revealed the presence of rotameric conformers, created by rotational hindrance at the C(sp3) -C(sp2) glucosyl-flavone linkage in these flavone C-glycosides. SN - 0021-8561 UR - https://www.unboundmedicine.com/medline/citation/16366694/Flavone_C_glycosides_from_leaves_of_Oxalis_triangularis_ L2 - https://doi.org/10.1021/jf051626h DB - PRIME DP - Unbound Medicine ER -