Tan, "Separation of kaempferols in Impatiens balsamina flowers by capillary electrophoresis with electrochemical detection," Journal of Chromatography A, vol.
Separate stock solutions were made in methanol of lawsone, quercetin, MNQ, and kaempferol for the reference standards.
[sup.13]C-NMR (DMSOd 6, 500 MHz): [delta]C (ppm): 146.80 (C-2), 135.60 (C-3), 175.80 (C-4), 160.70 (C-5), 98.10 (C-6), 163.80 (C-7), 93.40 (C-8), 156.10 (C-9), 103.00 (C-10), 121.60 (C-1'), 129.40 (C-2', 6'), 115.40 (C-3', 5'), and 159.10 (C-4'), which was in accordance with previous reports on kaempferol .
Furthermore, the polyphenols isolated from these plants, procyanidin B-3, (+)-catechin, gallic acid, methyl gallate, quercetin, quercetin-3-O-[beta]-D-glucoside, quercetin-3-O-[beta]-galactoside, quercetin-3-O-rutinose and kaempferol, exerted strong DPPH radical-scavenging activity.
2000b); methyl gallate, gallic acid, 3,4-dihydroxyben-zoic acid, 4-hydroxybenzoic acid, kaempferol, kaempferol-3-O-[beta]-D-galactoside, kaempferol 3-O-[beta]-D-glucoside, quercetin and quercetin 3-O-[beta]-D-glucoside from Orostachys japonicus (Park et al.
Kaempferol from Orostachys japonicus showed marked DPPH radical-scavenging activity with an I[C.sub.50] values of 6.54 [micro]M, whereas the derivatives of kaempferol from Armoracia rusticana, Zanthoxylum piperitum and Houttuynia cordata showed weak activities, with I[C.sub.50] values above 100 [micro]M.