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Quercetin glycoside

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https://www.readbyqxmd.com/read/28178217/flavonoid-composition-and-antitumor-activity-of-bee-bread-collected-in-northeast-portugal
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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...
January 14, 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
#8
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
#9
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
https://www.readbyqxmd.com/read/27960283/metabolism-of-quercetin-and-naringenin-by-food-grade-fungal-inoculum-rhizopus-azygosporus-yuan-et-jong-atcc-48108
#10
Gerard Bryan Gonzales, Guy Smagghe, Jens Wittevrongel, Nguyen Thai Huynh, John Van Camp, Katleen Raes
Rhizopus azygosporus Yuan et Jong (ATCC 48108), a starter culture for fermented soybean tempeh, produces β-glucosidases that cleave flavonoid glycosides into aglycones during fermentation. However, recent data suggest that fermentation of a flavonoid glycoside-rich extract with this strain did not result in the production of aglycones. Thus, in this paper, flavonoid metabolism of this strain was investigated. Incubation of flavonoid aglycones, naringenin and quercetin, with R. azygosporus resulted in the production of flavonoid glucosyl-, hydroxyl-, and sulfo-conjugated derivatives...
December 14, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27937045/sempervivum-davisii-phytochemical-composition-antioxidant-and-lipase-inhibitory-activities
#11
Yusuf Uzun, Abdullah Dalar, Izabela Konczak
CONTEXT: Sempervivum davisii Muirhead (Crassulaceae) is a traditional medicinal herb from Eastern Anatolia. To date the composition of phytochemicals and physiological properties of this herb were not subjected to any research. OBJECTIVE: This study identifies compounds in S. davisii hydrophilic extracts and evaluates their potential biological properties. MATERIALS AND METHODS: Ethanol-based lyophilized extracts were obtained from aerial parts of plant (10 g of ground dry plant material in 200 mL of acidified aqueous ethanol, shaken for 2 h at 22 °C with supernatant collected and freeze-dried under vacuum)...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/27933992/hydrothermal-degradation-of-rutin-identification-of-degradation-products-and-kinetics-study
#12
Matej Ravber, Darja Pečar, Andreja Goršek, Jernej Iskra, Željko Knez, Mojca Škerget
The model glycoside compound quercetin-3-O-rutinoside (rutin) was subjected to subcritical water within the temperature range of 120-220 °C, and the hydrothermal degradation products were analyzed. Two kinetic models describing the degradation of this compound in two different atmospheres (N2 and CO2), used for pressure establishment in the reactor, have been developed and compared. Reaction was considered a successive one with three irreversible steps. We confirmed that rutin degradation to quercetin follows first-order kinetics...
December 7, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27896020/identification-of-phenolic-secondary-metabolites-from-schotia-brachypetala-sond-fabaceae-and-demonstration-of-their-antioxidant-activities-in-caenorhabditis-elegans
#13
Mansour Sobeh, Esraa ElHawary, Herbenya Peixoto, Rola M Labib, Heba Handoussa, Noha Swilam, Ahmed H El-Khatib, Farukh Sharapov, Tamer Mohamed, Sonja Krstin, Michael W Linscheid, Abdel Nasser Singab, Michael Wink, Nahla Ayoub
BACKGROUND: Schotia brachypetala Sond. (Fabaceae) is an endemic tree of Southern Africa whose phytochemistry and pharmacology were slightly studied. The present work aimed at profiling the major phenolics compounds present in the hydro-alcohol extract from S. brachypetala leaves (SBE) using LC/HRESI/MS/MS and NMR and prove their antioxidant capabilities using novel methods. METHODS: In vitro assays; DPPH, TEAC persulfate decolorizing kinetic and FRAP assays, and in vivo assays: Caenorhabditis elegans strains maintenance, Intracellular ROS in C...
2016: PeerJ
https://www.readbyqxmd.com/read/27866749/inter-population-and-inter-organ-distribution-of-the-main-polyphenolic-compounds-of-epilobium-angustifolium
#14
Nicolas Baert, Jorma Kim, Maarit Karonen, Juha-Pekka Salminen
Rosebay willowherb (Epilobium angustifolium) contains large amounts of polyphenolic compounds, including tellimagrandin I-based oligomeric ellagitannins (ETs). The aim of this study was to assess the interpopulational and inter-organ variability of the polyphenol fingerprint of E. angustifolium. Seven ETs, 11 flavonol glycosides and neochlorogenic acid were quantified by UHPLC-DAD-ESI-QqQ-MS in the leaves, flowers and stem parts of plants from 10 populations. Total polyphenol content of leaves and flowers ranged from 150 to 200 mg/g dry wt, of which 90% was constituted by dimeric to heptameric ETs...
February 2017: Phytochemistry
https://www.readbyqxmd.com/read/27861139/in-vitro-antioxidant-and-anti-inflammatory-activities-of-isolated-compounds-of-ethanol-extract-from-sanchezia-speciosa-leonard-s-leaves
#15
Tung Bui Thanh, Loi Vu Duc, Hai Nguyen Thanh, Vung Nguyen Tien
BACKGROUND: Sanchezia speciosa has been used in traditional medicine for gastritis treatment in Vietnam. Some phytochemical study showed that S. speciosa contains high amounts of flavonoids and cardiac glycoside compounds. In the present study, we isolated four compounds from the ethanol extract of the S. speciosa leaf, and we evaluated the in vitro antioxidant and anti-inflammatory effect of the isolated compound from the ethanol extract of the S. speciosa leaf. METHODS: The leaf of S...
January 1, 2017: Journal of Basic and Clinical Physiology and Pharmacology
https://www.readbyqxmd.com/read/27855899/phenolic-compounds-extracted-by-acidic-aqueous-ethanol-from-berries-and-leaves-of-different-berry-plants
#16
Ye Tian, Jaana Liimatainen, Aino-Liisa Alanne, Anni Lindstedt, Pengzhan Liu, Jari Sinkkonen, Heikki Kallio, Baoru Yang
Phenolic compounds of berries and leaves of thirteen various plant species were extracted with aqueous ethanol and analyzed with UPLC-DAD-ESI-MS, HPLC-DAD, and NMR. The total content of phenolics was consistently higher in leaves than in berries (25-7856 vs. 28-711mg/100g fresh weight). Sea buckthorn leaves were richest in phenolic compounds (7856mg/100g f.w.) with ellagitannins as the dominant compound class. Sea buckthorn berries contained mostly isorhamnetin glycosides, whereas quercetin glycosides were typically abundant in most samples investigated...
April 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27854196/determination-of-flavonoids-polyphenols-and-antioxidant-activity-of-tephrosia-purpurea-a-seasonal-study
#17
Madan Mohan Pandey, Sayyada Khatoon, Subha Rastogi, Ajay Kumar Singh Rawat
OBJECTIVE: Tephrosia purpurea (Linn·) Pers. is widely used in traditional medicine to treat liver disorders, febrile attacks, enlargement and obstruction of liver, spleen, and kidney. In the present study, investigations were carried out to determine the seasonal impact on the content of flavonoid glycosides and on antioxidant activities so as to identify the optimal time of harvesting. METHODS: The plant materials were collected in different seasons during 2013-2014...
November 2016: Journal of Integrative Medicine
https://www.readbyqxmd.com/read/27845891/curviflorside-and-curviflorin-new-naphthalene-glycoside-and-flavanol-from-plicosepalus-curviflorus
#18
Nawal M Al Musayeib, Sabrin R M Ibrahim, Musarat Amina, Gadah A Al Hamoud, Gamal A Mohamed
The naphthalene glycosidecurviflorside [1,5-dihydroxy-8-methoxynaphthalene-2-O-β-D-xylopyranoside] (3) and the flavanol curviflorin [(+)-catechin-7-O-3″,4″-dihydroxybenzoate] (4), along with two known flavonoids: (+)-catechin (1) and quercetin (2) were isolated from the shoots of Plicosepalu scurviflorus Benth. (Loranthaceae) growing in Saudi Arabia and the chemical structures were elucidated by 2D-NMR spectroscopy.
November 15, 2016: Zeitschrift Für Naturforschung. C, A Journal of Biosciences
https://www.readbyqxmd.com/read/27794607/melibiose-a-nondigestible-disaccharide-promotes-absorption-of-quercetin-glycosides-in-rat-small-intestine
#19
Seiya Tanaka, Aki Shinoki, Hiroshi Hara
We demonstrated that melibiose, a nondigestible disaccharide composed of galactose and glucose with α-1,6 glycoside linkage, promotes the absorption of water-soluble quercetin glycosides in ligated small intestinal loop of anesthetized rats. Water-soluble quercetin glycoside, a quercetin-3-O-glucoside mixture (Q3GM), includes quercetin-3-O-glucoside (Q3G, 31.9%), mono (21.2%) and di (17.1%), glucose adducts with α-1,4 linkages. After instillation of Q3GM into the intestinal loop with or without melibiose, the plasma concentration of quercetin derivatives in the portal blood was considerably higher in the melibiose group at 60 min...
December 14, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27776529/biosynthesis-of-three-n-acetylaminosugar-conjugated-flavonoids-using-engineered-escherichia-coli
#20
A Ra Cho, Su Jin Lee, Bong Gyu Kim, Joong-Hoon Ahn
BACKGROUND: Nucleotide sugars serve as sugar donors for the synthesis of various glycones. The biological and chemical properties of glycones can be altered depending which sugar is attached. Bacteria synthesize unusual nucleotide sugars. A novel nucleotide sugar can be synthesized in Escherichia coli by introducing nucleotide biosynthetic genes from other microorganisms into E. coli. The engineered E. coli strains can be used as a platform for the synthesis of novel glycones. RESULTS: Four genes, Pdeg (UDP-N-acetylglucosamine C4,6-dehydratase), Preq (UDP-4-reductase), UDP-GlcNAc 6-DH (UDP-N-acetylglucosamine 6-dehydrogenase), and UXNAcS (UDP-N-acetylxylosamine synthase), were employed to synthesize UDP-quinovosamine, UDP-N-acetylglucosaminuronic acid, and UDP-N-acetylxylosamine in E...
October 24, 2016: Microbial Cell Factories
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