A new flavonol glycoside together with five known phenolic compounds were isolated from the whole herb of Callianthemum taipaicum. The compounds were identified as isorhamnetin-3-O-α-L-arabinoside-7-O-β-D-glucoside (1), isorhamnetin-3-O-β-D-glucoside (2), dibutyl phthalate (3), (+)-1-hydroxylpinoresinol-4'-β-D-glucoside (4), pinoresinol-4'-O-β-D-glucoside (5) and 2-phenylethyl-β-primeveroside (...

High-performance liquid chromatography-atmospheric pressure chemical ionization mass spectrometry was used to identify flavone aglycones and glycosides in soybean pods. Tandem mass spectrometry (MS-MS and MS-MS-MS) and photodiode array detection were also utilized in flavone characterization. A total of seven flavone aglycones and glycosides were identified. Among them three flavone aglycones--...

A purification and fractionation process of the edible flowers Tibouchina mollis urvilleana followed by first attempt to anthocyanin flavonol characterisation identification UHPLC-DAD-ESI-MS were developed. T. exhibited a higher monomeric content, mainly due presence 3-O-(6′-p-coumaroyl)-glucoside derivatives malvidin petunidin. Quercetin-3-O-hexoside was major identified in urvilleana, lack my...

Chemical analysis of the aqueous and n-butanol fractions methanolic extract Stipagrostis plumosa Munro ex T.Anderson, Poaceae, aerial parts led to isolation seven known phenolic glycosides 3,4′-dihydroxypropiophenone-3-O-β-d-glucoside, 5′-methoxy-3,4′-dihydroxypropiophenone-3-O-β-d-glucoside, 3′5′-dimethoxy-3,4′-dihydroxypropiophenone-3-O-β-d-glucoside, 3,4,5-trimethoxyphenyl-β-d-glucopyranose,...

BACKGROUND Suoyang originates from a psammophyte named Cynomorium songaricum Rupr and has been known as a phenolic-antioxidant-enriched traditional Chinese herbal medicine. The present study attempted to investigate the protective effect of phenolic antioxidants in Suoyang towards •OH-mediated MSCs and then further discusses the chemical mechanisms. METHODS The lyophilized aqueous extract of ...

Eriodictyol-7-O-glucoside, a flavonoid isolated from Dracocephalum rupestre, is among the most potent free radical scavenger. In the present study, we identified eriodictyol-7-O-glucoside as a novel nuclear factor E2-related factor 2 (Nrf2) activator using a high-throughput cellular screening method. This compound activated Nrf2 signaling pathway and was able to stabilize Nrf2 by delaying Nrf2 ...

Cleavage of gentiobiose in cell extracts of gentiobiose-grown Aerobacter aerogenes was dependent on the presence of adenosine 5'-triphosphate (ATP). The enzymes that participate in the overall reaction were shown to be a beta-glucoside kinase, which catalyzes the phosphorylation of gentiobiose with ATP to form gentiobiose monophosphate [6-O-phosphoryl-beta-d-glucopyranosyl-(1 --> 6)-d-glucose],...

The anthocyanin pattern of artichoke heads (Cynara scolymus L.) has been investigated by high-performance liquid chromatography-electrospray ionization mass spectrometry. For this purpose a suitable extraction and liquid chromatographic method was developed. Besides the main anthocyanins-cyanidin 3,5-diglucoside, cyanidin 3-glucoside, cyanidin 3,5-malonyldiglucoside, cyanidin 3-(3''-malonyl)glu...

An unknown fluorescent metabolite has been isolated from heads of eye-color mutants of Drosophila melanogaster. Only a few mutations cause it to accumulate, uiz. cardinal (cd), dark red brown (drb), Henna-recessive (Hn’), purple (pr), Punch2 (Pu’), Punch-Grape (Puff’), and scarlet (st). After purification by ion-exchange chromatography, the spectroscopic, chemical, and enzymatic analyses reveal...

The production of β-maltooligosaccharides of capsaicin was investigated using Lactobacillus delbrueckii and cyclodextrin glucanotransferase (CGTase) as biocatalysts. The cells of L. delbrueckii glucosylated capsaicin to give its β-glucoside. The β-glucoside of capsaicin was converted into the corresponding β-maltoside and β-maltotrioside by CGTase. On the other hand, β-melibioside and β-isomalt...