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Quercetin glycoside

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https://www.readbyqxmd.com/read/28332768/separation-of-caffeoylquinic-acids-and-flavonoids-from-asteris-souliei-by-high-performance-counter-current-chromatography-and-their-anti-inflammatory-activity-in-vitro
#1
Qiang Zhang, He-Ying Pei, Kai Chen, Huan Tang, Bo Wu, Ming-Hai Tang, Ai-Hua Peng, Hao-Yu Ye, Li-Juan Chen
Eleven compounds were successfully separated from Asteris souliei by using a two-step high-performance counter-current chromatography method. The first step involved a reversed phase isocratic counter-current chromatography separation using hexane/ethyl acetate/methanol/water (1:0.8:1:1 v/v), which produced three fractions, the first two of which were mixtures. The second step used step-gradient reversed-phase counter-current chromatography with hexane/butanol/ethyl acetate/methanol/water (1:0.5:3.5:1:4 v/v) initially followed by hexane/ethyl acetate/methanol/water (1:2:1:2 v/v) to separate Fraction 1 into seven compounds; and hexane/ethyl acetate/methanol/water (1:1:1:1...
March 23, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28320327/metabolomics-analysis-reveals-the-metabolic-and-functional-roles-of-flavonoids-in-light-sensitive-tea-leaves
#2
Qunfeng Zhang, Meiya Liu, Jianyun Ruan
BACKGROUND: As the predominant secondary metabolic pathway in tea plants, flavonoid biosynthesis increases with increasing temperature and illumination. However, the concentration of most flavonoids decreases greatly in light-sensitive tea leaves when they are exposed to light, which further improves tea quality. To reveal the metabolism and potential functions of flavonoids in tea leaves, a natural light-sensitive tea mutant (Huangjinya) cultivated under different light conditions was subjected to metabolomics analysis...
March 20, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28317733/antioxidant-activities-and-structural-characterization-of-flavonol-o-glycosides-from-seeds-of-japanese-horse-chestnut-aesculus-turbinata-blume
#3
Hideto Kimura, Satoshi Ogawa, Tomoe Ishihara, Mahoko Maruoka, Shota Tokuyama-Nakai, Mitsuo Jisaka, Kazushige Yokota
We attempted to evaluate the contents and distribution of antioxidants in the whole seeds, seed shells, and peeled seeds of the Japanese horse chestnut. The seed shells exhibited the highest antioxidant activities due to the presence of highly polymeric proanthocyanidins as we have reported recently. On the other hand, the peeled seeds predominantly contained flavonols such as quercetin and kaempferol at a high level of 66.7% of total polyphenols, also contributing to the predominant antioxidant activities...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28294257/protein-bound-vaccinium-fruit-polyphenols-decrease-ige-binding-to-peanut-allergens-and-rbl-2h3-mast-cell-degranulation-in-vitro
#4
Nathalie J Plundrich, Rishipal R Bansode, E Allen Foegeding, Leonard L Williams, Mary Ann Lila
Peanut allergy is a worldwide health concern. In this study, the natural binding properties of plant-derived polyphenols to proteins was leveraged to produce stable protein-polyphenol complexes comprised of peanut proteins and cranberry (Vaccinium macrocarpon Ait.) or lowbush blueberry (Vaccinium angustifolium Ait.) pomace polyphenols. Protein-bound and free polyphenols were characterized and quantified by multistep extraction of polyphenols from protein-polyphenol complexes. Immunoblotting was performed with peanut-allergic plasma to determine peanut protein-specific IgE binding to unmodified peanut protein, or to peanut protein-polyphenol complexes...
March 15, 2017: Food & Function
https://www.readbyqxmd.com/read/28278644/phytochemical-components-and-biological-activities-of-silene-arenarioides-desf
#5
Lynda Golea, Mohammed Benkhaled, Catherine Lavaud, Christophe Long, Hamada Haba
In this study, six known compounds 1-6 were isolated from the aerial parts of Silene arenarioides Desf. using different chromatographic methods. The structures of these compounds were identified as maltol glycoside (1), soyacerebroside I (2), chrysin (3), apigenin (4), quercetin (5) and stigmasterol glucoside (6). The compounds (1) and (2) are reported for the first time from this genus. The isolated compounds were determined using NMR techniques ((1)H NMR, (13)C NMR, COSY, HSQC and HMBC) and mass spectroscopy (ESI-MS)...
February 24, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28262394/the-in-vitro-anthelmintic-properties-of-browse-plant-species-against-haemonchus-contortus-is-determined-by-the-polyphenol-content-and-composition
#6
G Mengistu, H Hoste, M Karonen, J-P Salminen, W H Hendriks, W F Pellikaan
The aims of the present study were to (a) evaluate the anthelmintic activity of 10 East African browse plant extracts, (b) examine their role in inhibition of Haemonchus contortus larval exsheathment, (c) establish relationship between inhibition of larval exsheathment and browse plant extract polyphenol composition. Acetone/water (70/30%) extracts of air dried leaves of Acacia etbaica, Cadaba farinosa, Capparis tomentosa, Dichrostachys cinerea, Dodonaea angustifolia, Euclea racemosa, Maerua angolensis, Maytenus senegalensis, Rhus natalensis and Senna singueana were used...
December 31, 2016: Veterinary Parasitology
https://www.readbyqxmd.com/read/28256049/exploratory-studies-on-the-in-vitro-anti-inflammatory-potential-of-two-herbal-teas-annona-muricata-l-and-jasminum-grandiflorum-l-and-relation-with-their-phenolic-composition
#7
Andreia P Oliveira, Ivone Sá, David M Pereira, Rui F Gonçalves, Paula B Andrade, Patrícia Valentão
The need of new anti-inflammatory drugs has led to the search for safer and more potent molecules in distinct sources, such as natural products. This work aimed to explore the anti-inflammatory potential of aqueous extracts from two herbal teas (Annona muricata L. and Jasminum grandiflorum L.) in RAW 264.7 macrophages cells and in cell-free assays. Furthermore, the phenolic composition of both extracts and of their hydrolysates was characterized by HPLC-DAD, in order to establish possible relationships with the biological activity...
March 2, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28245624/flavonoids-from-agrimonia-pilosa-ledeb-free-radical-scavenging-and-dna-oxidative-damage-protection-activities-and-analysis-of-bioactivity-structure-relationship-based-on-molecular-and-electronic-structures
#8
Liancai Zhu, Jinqiu Chen, Jun Tan, Xi Liu, Bochu Wang
To clarify the substantial basis of the excellent antioxidant capacity of Agrimonia pilosa Ledeb. Fourteen flavonoids were isolated and identified from Agrimonia pilosa Ledeb, seven of which have notable DPPH radical scavenging activities, i.e., catechin, luteolin, quercetin, quercitrin, hyperoside, rutin, luteolin-7-O-β-glucoside with IC50 values of 5.06, 7.29, 4.36, 7.12, 6.34, 6.36 and 8.12 µM, respectively. The DNA nicking assay showed that five flavonoids from Agrimonia pilosa Ledeb-taxifolin, catechin, hyperoside, quercitrin and rutin-have good protective activity against DNA oxidative damage...
February 26, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28221885/antibacterial-and-antiadhesive-activities-of-extracts-from-edible-plants-against-soft-drink-spoilage-by-asaia-spp
#9
Hubert Antolak, Agata Czyzowska, Dorota Kregiel
This study was conducted to investigate the antibacterial and antiadhesive activities of ethanol extracts from five edible plant parts: cinnamon bark ( Cinnamomum zeylanicum ), licorice root ( Glycyrrhiza radix ), nettle leaves ( Urtica dioica ), green tea leaves ( Camellia sinensis ), and elderberry flowers ( Sambucus nigra ). The chemical constituents of the extracts were identified using high-performance liquid chromatography and liquid chromatography plus mass spectrometry. Six strains of Asaia lannensis and Asaia bogorensis bacteria isolated from spoiled commercial fruit-flavored noncarbonated mineral water were used...
January 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28220704/functional-characterization-of-a-new-tea-camellia-sinensis-flavonoid-glycosyltransferase
#10
Xianqian Zhao, Peiqiang Wang, Mingzhuo Li, Yeru Wang, Xiaolan Jiang, Lilan Cui, Yumei Qian, Juhua Zhuang, Liping Gao, Tao Xia
Tea (Camellia sinensis) is an important commercial crop, in which the high content of flavonoids provides health benefits. A flavonoid glycosyltransferase (CsUGT73A20), belonging to cluster IIIa, was isolated from tea plant. The recombinant CsUGT73A20 in Escherichia coli exhibited a broad substrate tolerance toward multiple flavonoids. Among them, kaempferol was the optimal substrate compared to quercetin, myricetin, naringenin, apigenin, and kaempferide. However, no product was detected when UDP-galactose was used as the sugar donor...
March 3, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28218702/phytochemical-study-of-tapirira-guianensis-leaves-guided-by-vasodilatory-and-antioxidant-activities
#11
Amélia M G Rodrigues, Denise O Guimarães, Tatiana U P Konno, Luzineide W Tinoco, Thiago Barth, Fernando A Aguiar, Norberto P Lopes, Ivana C R Leal, Juliana M Raimundo, Michelle F Muzitano
The aim of this research was to perform a phytochemical study of the methanol leaves extract of T. guianensis (MET) guided by vasodilatory and antioxidant activities. The chemical profile of MET and the ethyl acetate fraction (EA fraction) was determined by HPLC-UV-MS and EA fraction guided fractionation by reverse-phase chromatography. The vasorelaxant effects of MET, fractions, sub-fractions and constituents were assessed on rat aorta pre-contracted with phenylephrine. Antioxidant activity was evaluated by using a DPPH assay...
February 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28178217/flavonoid-composition-and-antitumor-activity-of-bee-bread-collected-in-northeast-portugal
#12
Filipa Sobral, Ricardo C Calhelha, Lillian Barros, Montserrat Dueñas, Andreia Tomás, Celestino Santos-Buelga, Miguel Vilas-Boas, Isabel C F R Ferreira
Bee bread (BB) is a fermented mixture of plant pollen, honey, and bee saliva that worker bees use as food for larvae, and for young bees to produce royal jelly. In the present study, five BB samples, collected from Apis mellifera iberiensis hives located in different apiaries near Bragança, in the northeast region of Portugal, and one BB commercial sample were characterized by high-performance liquid chromatography coupled to a diode array detector and electrospray mass spectrometry (HPLC-DAD-ESI/MS) in terms of phenolic compounds, such as flavonoid glycoside derivatives...
February 7, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28165379/in-vitro-lipophilic-antioxidant-capacity-antidiabetic-and-antibacterial-activity-of-citrus-fruits-extracts-from-aceh-indonesia
#13
Ernawita, Ruri Agung Wahyuono, Jana Hesse, Uta-Christina Hipler, Peter Elsner, Volker Böhm
This study reports in vitro lipophilic antioxidant, inhibition of α-amylase and antibacterial activities of extracts of peel and pulp of citrus samples from Aceh, Indonesia. HPLC (high-performance liquid chromatography), phytochemical, and FTIR (fourier transform infrared) analysis detected carotenoids, flavonoids, phenolic acids and terpenoids, contributing to the biological potencies. Most peel and pulp extracts contained lutein and lower concentrations of zeaxanthin, α-carotene, β-carotene and β-cryptoxanthin...
February 3, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28142197/crystal-structure-of-%C3%AE-glucosidase-1a-from-thermotoga-neapolitana-and-comparison-of-active-site-mutants-for-hydrolysis-of-flavonoid-glucosides
#14
Tejas S Kulkarni, Samiullah Khan, Rodrigo Villagomez, Tahir Mahmood, Sofia Lindahl, Derek T Logan, Javier A Linares-Pastén, Eva Nordberg Karlsson
The β-glucosidase TnBgl1A catalyses hydrolysis of O-linked terminal β-glycosidic bonds at the non-reducing end of glycosides/oligosaccharides. Enzymes with this specificity have potential in lignocellulose conversion (degrading cellobiose to glucose) and conversion of bioactive flavonoids (modification of glycosylation results in modulation of bioavailability). Previous work has shown TnBgl1A to hydrolyse 3, 4'and 7 glucosylation in flavonoids, and although conversion of 3-glucosylated substrate to aglycone was low, it was improved by mutagenesis of residue N220...
January 31, 2017: Proteins
https://www.readbyqxmd.com/read/28135851/flavonoids-with-hepatoprotective-activity-from-the-leaves-of-cleome-viscosa-l
#15
Tan Phat Nguyen, Cong Luan Tran, Chi Hung Vuong, Thi Hong Tuoi Do, Tien Dung Le, Dinh Tri Mai, Nhat Minh Phan
One new flavonol glycoside named visconoside C (1), together with seven known flavonol glycosides, quercetin 3-O-β-d-glucopyranoside 7-O-α-l-rhamnopyranoside (2), quercetin 7-O-α-l-rhamnopyranoside (3), astragalin (4), kaempferol 3-O-(4-O-acetyl)-α-l-rhamnopyranoside (5), kaempferol 7-O-α-l-rhamnopyranoside (6), kaempferitrin (7) and kaempferol 3-O-β-d-glucopyranoside 7-O-α-l-rhamnopyranoside (8) were isolated by various chromatography methods from the leaves of Cleome viscosa L. Their structures were elucidated by IR, UV, HR-ESI-MS and NMR (1D & 2D) experiments...
January 30, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28117024/natural-therapies-of-the-inflammatory-bowel-disease-the-case-of-rutin-and-its-aglycone-quercetin
#16
Solomon Habtemariam, Abebech Belai
Inflammatory bowel disease (IBD), commonly represented by ulcerative colitis and Crohn's disease, is a form of chronic inflammatory disorders of the gastrointestinal system. Its current drug treatment include the use of antibiotics, 5-aminosalicylates, corticosteroids, immune-modifying agents and biologics such as anti-TNF agents and adhesion molecules blockers. These drugs have inherent problems of efficacy as many IBD sufferers need surgical intervention at some stage, high cost especially for the protein-based drugs, loss of efficacy and unwanted side effects...
January 20, 2017: Mini Reviews in Medicinal Chemistry
https://www.readbyqxmd.com/read/28095510/screening-and-identifying-antioxidative-components-in-ginkgo-biloba-pollen-by-dpph-hplc-pad-coupled-with-hplc-esi-ms2
#17
Jiying Qiu, Xiangyan Chen, A I Netrusov, Qingxin Zhou, Danyang Guo, Xiaoyong Liu, Hailun He, Xue Xin, Yifen Wang, Leilei Chen
The Ginkgo biloba is one of ancient trees that exists from billions of years ago, its leaf and nut are used as herbs and foods in China, while so far its pollen does not have any application except pollination. In order to evaluate the antioxidant activity of Ginkgo biloba pollen, and rapidly screen its antioxidative components, the 1,1-diphenyl-2-picrylhydrazyl (DPPH) scavenging ability, total flavonoid, total phenol, and proanthocyanidin of Ginkgo biloba pollen were determined and compared with those of Ginkgo biloba leaf and nut, and the off-line DPPH-HPLC-PAD and HPLC-ESI-MS2 were applied for screening and identifying the antioxidant flavonoids in Ginkgo biloba pollen...
2017: PloS One
https://www.readbyqxmd.com/read/28091822/does-the-growth-differentiation-balance-hypothesis-explain-allocation-to-secondary-metabolites-in-combretum-apiculatum-an-african-savanna-woody-species
#18
Dawood Hattas, Peter F Scogings, Riitta Julkunen-Tiitto
The growth differentiation balance hypothesis (GDBH) provides a framework that predicts a trade-off between costs of secondary metabolites (SMs) relative to the demand for photosynthate by growth. However, this hypothesis was developed using empirical evidence from plant species in northern boreal and temperate systems, leaving its applicability to species under different abiotic and biotic conditions questionable and generalizations problematic. The objective of this study was to investigate whether the GDBH explains allocation to SMs in the deciduous African savanna woody species C...
February 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28066105/antifertility-activity-of-thevetia-peruviana-pers-k-schum-leaf-in-female-sprague-dawley-rat
#19
Jhuma Samanta, Snehendu Bhattacharya, Avtar C Rana
OBJECTIVES: Thevetia peruviana (Pers.) K. Schum. (Apocynaceae) is known to possess cardioactive glycoside such as thevetin A, thevetin B, neriifolin, peruvoside, thevetoxin, and ruvoside. Traditionally, T. peruviana leaves are used as abortifacient. The aim of the present study is to evaluate antifertility potential of T. peruviana leaves. SUBJECTS AND METHODS: Cardiac glycoside freed leaves of T. peruviana were extracted with methanol using maceration method. The dried cardiac glycoside-free methanolic extract of T...
November 2016: Indian Journal of Pharmacology
https://www.readbyqxmd.com/read/28019719/identification-and-enrichment-of-%C3%AE-glucosidase-inhibiting-dihydrostilbene-and-flavonoids-from-glycyrrhiza-uralensis-leaves
#20
Rigui Ye, Yu-Hong Fan, Chao-Mei Ma
To exploit Glycyrrhiza uralensis resources, we examined the bioactive constituents of G. uralensis leaves. Seven chemical components were isolated by repeat column chromatography, and using spectroscopic methods, their structures were determined to be a novel prenylated dihydrostilbene, α,α'-dihydro-3,5,3',4'-tetrahydroxy-2,5'-diprenylstilbene (1); a methylated flavonoid, quercetin-3-Me ether (4); and 5 prenylated flavonoids: 5'-prenylquercetin (3), 8-[(E)-3-hydroxymethyl-2-butenyl]eriodictyol (7), 6-prenyleriodictyol (5), 5'-prenyleriodictyol (6), and 6-prenylquercetin-3-Me ether (2)...
January 18, 2017: Journal of Agricultural and Food Chemistry
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