Loganin and New Iridoid Glucosides inGentiana pedicellata

Abstract

2'- P-Coumaroyl-loganin, 2'-feruloyl-loganin, 2'-caffeoyl-loganin, and the known iridoid loganin have been isolated from flowers and leaves of Gentiana pedicellata (Gentianaceae). This is the first occurrence of iridoid glucosides being reported in this species.

Iridoid glucosides from Strychnos nux-vomica

“…The 13 C NMR spectrum of 1 (Table 2) confirmed the presence of 18 carbons. These spectral features were very close to those observed for 7-O-acetylloganic acid 5 (Nakamoto et al, 1988;Garcia and Chulia, 1986). The 1 H and 13 CNMR spectra of compound 1 showed the absence of a carbomethoxy function ( 3.6 s; 51.3) as in loganin, a common iridoid in many plants (Jensen et al, 2002;Calis et al, 1984).…”

Iridoids from Gentiana loureirii

“…After having excluded the resonances due to the loganic acid moiety, the remaining signals in the 1 H and 13 C NMR spectra of 2 (Tables 2 and 3) were identical with those for a caffeoyl unit (Sridhar et al, 2004;Garcia and Chulia, 1986). The molecular formula of 3 was determined to be C 23 H 28 O 12 .…”

Mass spectrometry of underivatized naturally occurring glycosides

“…, 1991). Different mono- (Sati et al, 1986;Garcia and Chulia, 1986;Gering et a f . , 1987b;Inoue et al, 1991; Rasoanaivo et a f .…”