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https://www.readbyqxmd.com/read/28323050/antiplasmodial-activity-of-mezoneuron-benthamianum-leaves-and-identification-of-its-active-constituents
#1
Olivia Jansen, Alembert T Tchinda, Jean Loua, Virginie Esters, Ewa Cieckiewicz, Allison Ledoux, Paul D Toukam, Luc Angenot, Monique Tits, Aliou M Balde, Michel Frédérich
ETHNOPHARMACOLOGICAL RELEVANCE: Decoctions of the leaves of M. benthamianum Baill. are used by traditional healers in Guinea to treat malaria and this use was validated by a preliminary clinical assay. AIM OF THE STUDY: To evaluate the in vitro antiplasmodial activity and to identify active compounds from extracts of M. benthamianum leaves. MATERIAL AND METHODS: Antiplasmodial activity of extracts, fractions and pure compounds was evaluated in vitro against a chloroquine-sensitive strain of Plasmodium falciparum (3D7) using the measurement of the plasmodial lactate dehydrogenase activity...
March 17, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28317741/a-novel-method-for-the-quality-control-of-saffron-through-the-simultaneous-analysis-of-authenticity-and-adulteration-markers-by-liquid-chromatography-quadrupole-time-of-flight-mass-spectrometry
#2
Miguel Guijarro-Díez, María Castro-Puyana, Antonio Luis Crego, María Luisa Marina
A liquid chromatography-(quadrupole-time of flight)-mass spectrometry methodology was developed to assess the authenticity of saffron through the analysis of a group of kaempferol derivatives recently proposed as novel authenticity markers as a result of a metabolomic study of saffron (kaempferol 3-O-glucoside, kaempferol 3-O-sophoroside, kaempferol 3,7-O-diglucoside, kaempferol 3,7,4'-O-triglucoside, kaempferol 3-O-sophoroside-7-O-glucoside). Geniposide was also studied as an adulteration marker of saffron with gardenia...
August 1, 2017: Food Chemistry
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/28317253/correlation-between-the-potency-of-flavonoids-for-cytochrome-c-reduction-and-inhibition-of-cardiolipin-induced-peroxidase-activity
#4
Ricardo Lagoa, Alejandro K Samhan-Arias, Carlos Gutierrez-Merino
There are large differences between flavonoids to protect against apoptosis, a process in which cytochrome c (Cyt c) plays a key role. In this work, we show that 7 of 13 flavonoids studied have a capacity to reduce Cyt c similar or higher than ascorbate, the flavonols quercetin, kaempferol and myricetin, flavanol epigallocatechin-gallate, anthocyanidins cyanidin and malvidin, and the flavone luteolin. In contrast, the kaempferol 3(O)- and 3,4'(O)-methylated forms, the flavanone naringenin, and also apigenin and chrysin, had a negligible reducing capacity...
March 20, 2017: BioFactors
https://www.readbyqxmd.com/read/28300406/enzymatic-synthesis-of-a-novel-kaempferol-3-o-%C3%AE-d-glucopyranosyl-1%C3%A2-4-o-%C3%AE-d-glucopyranoside-using-cyclodextrin-glucanotransferase-and-its-inhibitory-effects-on-aldose-reductase-inflammation-and-oxidative-stress
#5
Woo-Jae Choung, Seung Hwan Hwang, Dam-Seul Ko, Set Byeol Kim, Seo Hyun Kim, Sung Ho Jeon, Hee-Don Choi, Soon Sung Lim, Jae-Hoon Shim
Kaempferol-3-O-β-D-glucopyranoside (astragalin, AS), a major flavonoid that exists in various plants, exerts anti-oxidant, anti-tumor, anti-human immunodeficiency virus (HIV), and anti-inflammatory effects. However, the low water solubility of AS limits its use. In this study, we used cyclodextrin glucanotransferase (CGTase) with maltose (G2) as a donor molecule to enzymatically modify AS to improve its water solubility and physiochemical properties. We isolated the glycosylated astragalin (G1-AS) and identified the structure of G1-AS as kaempferol-3-O-β-D-glucopyranosyl-(1→4)-O-α-D-glucopyranoside, where one glucose residue was transferred to AS...
March 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28300024/development-and-validation-of-a-rapid-lc-ms-ms-method-for-simultaneous-determination-of-kaempferol-and-quercetin-in-thespesia-populnea-extract
#6
Hiteksha Panchal, Mamta B Shah
In this study, a simple and rapid LC with tandem MS method was developed and validated for the simultaneous determination of kaempferol and quercetin in <i>Thespesia populnea</i> extract. The compounds were eluted using a Gemini C18 column (50 × 2.0 mm, 3 μm), with the mobile phase consisting of acetonitrile–0.3% formic acid in water at the flow rate of 0.400 mL/min. The assay exhibited a linear dynamic range of 25–2500 ng/mL for both kaempferol and quercetin. The values for intra- and interday precision and accuracy were well within the generally accepted criteria for analytical methods (<15%)...
March 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28287259/adaptation-in-caco-2-human-intestinal-cell-differentiation-and-phenolic-transport-with-chronic-exposure-to-blackberry-rubus-sp-extract
#7
Benjamin W Redan, George P Albaugh, Craig S Charron, Janet A Novotny, Mario G Ferruzzi
As evidence mounts for a health-protective role of dietary phenolics, the importance of understanding factors influencing bioavailability increases. Recent evidence has suggested chronic exposure to phenolics may impact their absorption and metabolism. To explore alterations occurring from chronic dietary exposure to phenolics, Caco-2 cell monolayers were differentiated on Transwell® inserts with 0-10 μM blackberry (Rubus sp.) total phenolics extracts rich in anthocyanins, flavonols, and phenolic acids. Following differentiation, apical to basolateral transport of phenolics was assessed from an acute treatment of 100 μM blackberry phenolics from 0-4 h...
March 13, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28282879/hepatoprotective-effects-of-nicotiflorin-from-nymphaea-candida-against-concanavalin-a-induced-and-d-galactosamine-induced-liver-injury-in-mice
#8
Jun Zhao, Shilei Zhang, Shuping You, Tao Liu, Fang Xu, Tengfei Ji, Zhengyi Gu
Nymphaea candida was used to treat hepatitis in Ugyhur medicine, and nicotiflorin (kaempferol 3-O-β-rutinoside) is the main characteristic component in this plant [...].
March 8, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28282861/elderberry-and-elderflower-extracts-phenolic-compounds-and-metabolites-and-their-effect-on-complement-raw-264-7-macrophages-and-dendritic-cells
#9
Giang Thanh Thi Ho, Helle Wangensteen, Hilde Barsett
Modulation of complement activity and inhibition of nitric oxide (NO) production by macrophages and dendritic cells may have therapeutic value in inflammatory diseases. Elderberry and elderflower extracts, constituents, and metabolites were investigated for their effects on the complement system, and on NO production in lipopolysaccharide (LPS)-activated RAW 264.7 macrophages and murine dendritic D2SC/I cells. The EtOH crude extracts from elderberry and elderflower and the isolated anthocyanins and procyanidins possessed strong complement fixating activity and strong inhibitory activity on NO production in RAW cells and dendritic cells...
March 8, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28281364/chemical-composition-antioxidant-and-antibacterial-activities-of-tamarix-balansae-j-gay-aerial-parts
#10
Abbes Benmerache, Mounira Benteldjoune, Abdulmagid Alabdul Magid, Amin Abedini, Djemaa Berrehal, Ahmed Kabouche, Sophie C Gangloff, Laurence Voutquenne-Nazabadioko, Zahia Kabouche
A previously undescribed phenolic sulphate ester, potassium 34-dihydroxy-3-methoxybenzoic acid methyl ester-5-sulphate (1), along with nine known flavonoids, kaempferol-3-O-potassium sulphate-4',7-dimethyl ether (2), kaempferol-4',7-dimethyl ether (3), rhamnocitrin-3-O-potassium sulphate (4), rhamnocitrin (5), kaempferol (6), quercetin (7), afzelin (8), quercetin-3-O-α-l-rhamnopyranoside (9) and luteolin-3'-O-potassium sulphate (10) were isolated from the aerial parts of Tamarix balansae. Structures elucidation was performed by comprehensive 1D and 2D NMR analyses, mass spectrometry and by comparison with literature data...
March 10, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28278670/bioactivity-guided-isolation-of-flavonoids-from-cynanchum-acutum-l-subsp-sibiricum-willd-rech-f-and-investigation-of-their-antiproliferative-activity
#11
Ilyas Yildiz, Ozkan Sen, Ramazan Erenler, Ibrahim Demirtas, Lutfi Behcet
Cynanchum acutum L. subsp. sibiricum (Willd.) Rech. f. was extracted with hexane, acetone, methanol and water individually. A sample was heated in water then extracted with ethyl acetate. Among the extracts, the ethyl acetate extract exhibited the most antiproliferative activity, so isolation of bioactive compounds was carried out from this extract. A new compound, kaempferol-3-O-β-xylopyranosyl-(1-2)-β-rhamnopyranoside (1) along with five known compounds, quercetin-3-O-β-xyloside (2), kaempferol-3-O-β-glucoside (3), quercetin-3-O-β-glucoside (4), kaempferol-3-O-β-rhamnopyranoside (5), and kaempferol-3-O-β-d-neohesperidoside (6) were isolated from ethyl acetate extract...
February 14, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28278502/kaempferol-modulates-dna-methylation-and-downregulates-dnmt3b-in-bladder-cancer
#12
Wei Qiu, Jun Lin, Yichen Zhu, Jian Zhang, Liping Zeng, Ming Su, Ye Tian
BACKGROUND: Genomic DNA methylation plays an important role in both the occurrence and development of bladder cancer. Kaempferol (Kae), a natural flavonoid that is present in many fruits and vegetables, exhibits potent anti-cancer effects in bladder cancer. Similar to other flavonoids, Kae possesses a flavan nucleus in its structure. This structure was reported to inhibit DNA methylation by suppressing DNA methyltransferases (DNMTs). However, whether Kae can inhibit DNA methylation remains unclear...
March 8, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28274421/screening-and-evaluation-of-active-compounds-in-polyphenol-mixtures-by-hplc-coupled-with-chemical-methodology-and-its-application
#13
Yue Zhao, Ying Wang, Zi-Tao Jiang, Rong Li
An off-line high performance liquid chromatography (HPLC) coupled with chemical methods has been developed to evaluate antioxidant activity of 11 standard polyphenol compounds (SPCs) and vitamin C (Vc) in terms of radical scavenging abilities. The structure-activity relationships of each SPC were also discussed. SPCs showed different abilities in scavenging 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2'-azinobis-3-ethyl-benzthiazoline-6-sulphonate (ABTS(+)) and hydroxyl (OH) free radicals. Among SPCs, quercetin and kaempferol, as typical flavonoids, displayed the greatest radical-scavenging activities and even exhibited higher activity in OH radical removal ability than that of Vc...
July 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28273864/screening-of-peruvian-medicinal-plants-for-tyrosinase-inhibitory-properties-identification-of-tyrosinase-inhibitors-in-hypericum-laricifolium-juss
#14
Yanymee Nimesia Guillen Quispe, Seung Hwan Hwang, Zhiqiang Wang, Soon Sung Lim
Tyrosinase inhibitors are of far-ranging importance in cosmetics, medicinal products, and food industries. Peru is a diverse country with a wide variety of plants that may contain excellent anti-tyrosinase inhibitors. In the present study, the tyrosinase inhibitory properties of 50 medicinal plant extracts from Peru were investigated using tyrosinase assay. Among plant extracts, those that showed an inhibition rate >50% were Hypericum laricifolium Juss., Taraxacum officinaleF.H.Wigg., and Muehlenbeckia vulcanicaMeisn...
March 4, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28273207/kaempferol-inhibited-vegf-and-pgf-expression-and-in-vitro-angiogenesis-of-hrecs-under-diabetic-like-environment
#15
X H Xu, C Zhao, Q Peng, P Xie, Q H Liu
Diabetic retinopathy (DR) is one of the common and specific microvascular complications of diabetes. This study aimed to investigate the anti-angiogenic effect of kaempferol and explore its underlying molecular mechanisms. The mRNA expression level of vascular endothelial growth factor (VEGF) and placenta growth factor (PGF) and the concentrations of secreted VEGF and PGF were measured by qTR-PCR and ELISA assay, respectively. Human retinal endothelial cells (HRECs) proliferation, migration, and sprouting were measured by CCK-8 and transwell, scratching wound, and tube formation assays, respectively...
March 2, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28265358/blanching-influences-the-phenolics-composition-antioxidant-activity-and-inhibitory-effect-of-adansonia-digitata-leaves-extract-on-%C3%AE-amylase-%C3%AE-glucosidase-and-aldose-reductase
#16
Emmanuel A Irondi, Jacob K Akintunde, Samson O Agboola, Aline A Boligon, Margareth L Athayde
Adansonia digitata (A. digitata) leaves serve as food and has several medicinal uses in many parts of the world. This study evaluated the influence of blanching on the phenolics composition, antioxidant activity, and inhibitory effect of methanol extract of A. digitata leaves on the activities of some key enzymes (α-amylase, α-glucosidase, and aldose reductase) implicated in type 2 diabetes (T2D) in vitro. Reverse-phase HPLC analysis revealed that the leaves had appreciable levels of flavonoids and phenolic acids, including catechin, epicatechin, rutin, quercitrin, quercetin, kaempferol, and luteolin (flavonoids); gallic, chlorogenic, caffeic, and ellagic acids (phenolic acids)...
March 2017: Food Science & Nutrition
https://www.readbyqxmd.com/read/28262619/kaempferol-ameliorates-h9n2-swine-influenza-virus-induced-acute-lung-injury-by-inactivation-of-tlr4-myd88-mediated-nf-%C3%AE%C2%BAb-and-mapk-signaling-pathways
#17
Ruihua Zhang, Xia Ai, Yongjie Duan, Man Xue, Wenxiao He, Cunlian Wang, Tong Xu, Mingju Xu, Baojian Liu, Chunhong Li, Zhijun Wang, Ruihong Zhang, Guohua Wang, Shufei Tian, Huifeng Liu
Kaempferol, a very common type of dietary flavonoids, has been found to exert antioxidative and anti-inflammatory properties. The purpose of our investigation was designed to reveal the effect of kaempferol on H9N2 influenza virus-induced inflammation in vivo and in vitro. In vivo, BALB/C mice were infected intranasally with H9N2 influenza virus with or without kaempferol treatment to induce acute lung injury (ALI) model. In vitro, MH-S cells were infected with H9N2 influenza virus with or without kaempferol treatment...
March 2, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
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
#18
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/28259640/structural-basis-for-inhibition-of-17%C3%AE-hydroxysteroid-dehydrogenases-by-phytoestrogens-the-case-of-fungal-17%C3%AE-hsdcl
#19
Alberto Cassetta, Jure Stojan, Ivet Krastanova, Katja Kristan, Mojca Brunskole Švegelj, Doriano Lamba, Tea Lanišnik Rižner
Phytoestrogens are plant-derived compounds that functionally and structurally mimic mammalian estrogens. Phytoestrogens have broad inhibitory activities toward several steroidogenic enzymes, such as the 17β-hydroxysteroid dehydrogenases (17β-HSDs), which modulate the biological potency of androgens and estrogens in mammals. However, to date, no crystallographic data are available to explain phytoestrogens binding to mammalian 17β-HSDs. NADP(H)-dependent 17β-HSD from the filamentous fungus Cochliobolus lunatus (17β-HSDcl) has been the subject of extensive biochemical, kinetic and quantitative structure-activity relationship studies that have shown that the flavonols are the most potent inhibitors...
March 1, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28258039/kaempferol-increases-apoptosis-in-human-cervical-cancer-hela-cells-via-pi3k-akt-and-telomerase-pathways
#20
Elham Kashafi, Maliheh Moradzadeh, Ashraf Mohamadkhani, Saiedeh Erfanian
Cervical cancer is one of the most frequent cancers in women worldwide. Defects in the apoptotic pathways are responsible for both the disease pathogenesis and its therapy resistance. It is thus a good candidate for treatment by pro-apoptotic agents. Kaempferol as a flavonoid has antioxidant and anti-tumor properties. Kaempferol has been shown to induce apoptosis and cell death in cancer cells. However, due to the problems in the treatment of cervical cancer, this study is designed to investigate the molecular mechanism by which kaempferol suppresses the growth of cervical cancer HeLa cell as compared with HFF cells (normal cells)...
February 28, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
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