Chemical Evaluation of Betula Species in Japan. I. Constituents of Betula ermanii.

Antioxidant and Anti-nitric Oxide Components from <i>Quercus glauca</i>

“…As shown in Table 2, compound 1 (IC 50 =42.18 µg/mL) showed moderate, 4-6 showed significant antioxidant activities, and 14 had very potent antioxidant activity, compared with the positive control α-tocopherol (IC 50 =14.05 µg/mL). In addition, three lignoids, (+ )-lyoniresinol-3α-O-α-L-rhamnoside (4), 11) …”

“…Our research group recently found that the crude extract of title plant and its sub-fractions had promising antioxidant activities (IC 50 =26.44, 15.72 µg/mL, for crude extract and EtOAc layer, respectively). Herein, we report the bioassay-directed fractionation leading to the isolation of two new lignan glycosides (1, 2), along with fourteen known compounds including 4 lignanoids: dihydrodehydodiconiferyl alcohol (3), 10) (+ )-lyoniresinol-3α-O-α-L-rhamnoside (4), 11) 5-methoxy-(+ )-isolariciresinol-9′-O-α-L-rhamnoside (5), 12) (+ )-acviculin (6) 12) ; 5 triterpenoids: batrogenic acid (7), 13) trachelosperogenin A (8), 14) paradrymonoside (9), 15) 24-epipinfaensin (10), 16) rosamultin (11) 17) ; 2 flavonoids: arimadendrin (12), 18) naringenin-7-O-β-D-glucoside (13) 19) ; 2 aromatics:…”

Antitumor-Promoting Constituents from Chaenomeles sinensis KOEHNE and Their Activities in JB6 Mouse Epidermal Cells

“…Compounds 4, 5, 7, 9-11 were identi- fied as the lupane-type triterpenes betulinic acid (4), 14) be- 16) alphitolic acid (10), 17) and ilekudinol C (11).…”

A Novel Eudesmane Glycosides Sesquiterpene from <i>Calendula</i> <i>officinalis</i> L.

“…Compound (2) gave a molecular ion peak in its EI-mass spectrum at m/z 588, in agreement with the molecular formula C 39 spectrum, which showed long-range correlation between oxymethine proton at δ 4.64 and C-9. On the basis of the above evidence, and comparative 1 H-NMR, 13 C-NMR data, of (2) with related compounds [30][31], compound (2) was elucidated to be lupane-3E-O-caffeoyl.…”