Flavonoid Glycosides from the Leaves of Machilus philippinensis

Abstract

Thirteen flavonoid glycosides (1-7, 11-13, 15, 17, and 18) were isolated from the EtOH extract of the leaves of Machilus philippinensis. Of these, kaempferol (2)

Structural characterization and bioactivity of proanthocyanidins from indigenous cinnamon (Cinnamomum osmophloeum)

“…These results are consistent with the structure of units, which are all epicatechin with hydroxyl groups at C3′ and C4′. According to the evidence outlined above and a comparison of the ESI‐MS, 1 H‐NMR and 13 C‐NMR data with values in the literature, compound 2 was determined to be parameritannin A1 (epicatechin‐(2β → O7,4β → 8)‐[epicatechin‐(4β → 6)]‐epicatechin‐(4β → 8)‐epicatechin) (Fig. b).…”

“…The α‐glucosidase (EC 3.2.1.20) inhibitory assay was performed according to Lin and Lee . The α‐amylase (EC 3.2.1.1) inhibitory assay was carried out according to Apostolidis et al with slight modifications.…”

Structure and antioxidant activity of diarylheptanoids extracted from bark of grey alder (Alnus incana) and potential of biorefinery-based bark processing of European trees

“…The 13 C NMR spectrum showed that procyanidins units are connected mostly by C4-C8 and C4-C6 interflavonoid bonds to B-type procyanidins: 36.2 ppm is for C4 in interflavonoid cis/trans link and a small signal at 29.8 ppm is for C4 in terminal units, 106.2 ppm (C8 in C4-C8) and 96.4 ppm (C6 in C4-C6) (Balde et al 1991b;Balde et al 1995;Navarette et al 2010). Judging by a diagnostic feature peak at 100.1 ppm related to ketal carbon signal (C2 in A-type procyanidins), condensed tannins of grey alder also contain double bond flavanyl units in the molecule (2C-O-7C), which is typical for A-type procyanidins (Lin and Lee 2010).…”

Phytochemical investigation and antimicrobial assessment of Bellis sylvestris leaves

“…Compounds 12-17 were respectively identified as kaempferol-3-O-b-D-glucopyranoside (Kazuma et al, 2003), kaempferol-3-Ob-D-galattopyranoside (Lin et al, 2011), kaempferol-3-O-b-Darabinopyranoside (De Almeida et al, 1998, nicotiflorin (Kazuma et al, 2003), kaempferol-3-robinobioside (Cardoso et al, 2005) and kaempferol-3-neohesperidoside (Kazuma et al, 2003).…”