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https://www.readbyqxmd.com/read/28734206/theoretical-investigation-of-the-conformational-space-of-baicalin
#1
Juan J Martínez Medina, Evelina G Ferrer, Patricia A M Williams, Nora B Okulik
Flavonoids are a large group of polyphenolic compounds ubiquitously present in plants. They are important components of human diet. They are recognized as potential drug candidates to be used in the treatment and prevention of a lot of pathological disorders, due to their protective effects. Baicalin (7-glucuronic acid 5, 6-dihydroxyflavone) is one of the main single active constituents isolated from the dried roots of Scutellaria baicalensis Georgi. The great interest on this flavonoid is due to its various pharmacological properties, such as antioxidant, antimicrobial, anti-inflammatory, anticancer and so on, and its high accumulation in the roots of S...
July 11, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28734166/naturally-occurring-immunomodulators-with-antitumor-activity-an-insight-on-their-mechanisms-of-action
#2
REVIEW
Shimaa Ibrahim Abdelmonym Mohamed, Ibrahim Jantan, Md Areeful Haque
Natural products with immunomodulatory activity are widely used in treatment of many diseases including autoimmune diseases, inflammatory disorders in addition to cancer. They gained a great interest in the last decades as therapeutic agents since they provide inexpensive and less toxic products than the synthetic chemotherapeutic agents. Immunomodulators are the agents that have the ability to boost or suppress the host defense response that can be used as a prophylaxis as well as in combination with other therapeutic modalities...
July 19, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28732370/silibinin-an-old-drug-for-hematological-disorders
#3
REVIEW
Hai Zou, Xing-Xing Zhu, Guo-Bing Zhang, Yuan Ma, Yi Wu, Dong-Sheng Huang
Silibinin (silybin), a non-toxic natural polyphenolic flavonoid, is the principal and the most biologically active component of silymarin. It is efficient in the treatment of acute and chronic liver disorders caused by toxins, drug, alcohol, hepatitis, and gall bladder disorders. Further, in our previous studies, we explored the anti-cancer efficacy in common cancers, such as lung, prostatic, colon, breast, bladder, as well as, hepatocellular carcinoma. Interestingly, silibinin is still not solely limited to the treatment of these diseases...
July 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28732012/multi-approach-metabolomics-analysis-and-artificial-simplified-phytocomplexes-reveal-cultivar-dependent-synergy-between-polyphenols-and-ascorbic-acid-in-fruits-of-the-sweet-cherry-prunus-avium-l
#4
Mauro Commisso, Martino Bianconi, Flavia Di Carlo, Stefania Poletti, Alessandra Bulgarini, Francesca Munari, Stefano Negri, Matteo Stocchero, Stefania Ceoldo, Linda Avesani, Michael Assfalg, Gianni Zoccatelli, Flavia Guzzo
Fruits of the sweet cherry (Prunus avium L.) accumulate a range of antioxidants that can help to prevent cardiovascular disease, inflammation and cancer. We tested the in vitro antioxidant activity of 18 sweet cherry cultivars collected from 12 farms in the protected geographical indication region of Marostica (Vicenza, Italy) during two growing seasons. Multiple targeted and untargeted metabolomics approaches (NMR, LC-MS, HPLC-DAD, HPLC-UV) as well as artificial simplified phytocomplexes representing the cultivars Sandra Tardiva, Sandra and Grace Star were then used to determine whether the total antioxidant activity reflected the additive effects of each compound or resulted from synergistic interactions...
2017: PloS One
https://www.readbyqxmd.com/read/28731232/a-comprehensive-review-of-agrimoniin
#5
REVIEW
Daniel M Grochowski, Krystyna Skalicka-Woźniak, Ilkay Erdogan Orhan, Jianbo Xiao, Marcello Locatelli, Jakub P Piwowarski, Sebastian Granica, Michał Tomczyk
Plant tannins are a unique class of polyphenols with relatively high molecular weights. Within the ellagitannins group, agrimoniin--dimeric ellagitannin--is one of the most representative compounds found in many plant materials belonging to the Rosaceae family. Agrimoniin was first isolated in 1982 from roots of Agrimonia pilosa Ledeb. (Rosaceae), a plant traditionally used in Japan and China as an antidiarrheal, hemostatic, and antiparasitic agent. Agrimoniin is a constituent of medicinal plants, which are often applied orally in the form of infusions, decoctions, or tinctures...
July 21, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28731131/assessment-of-the-antioxidant-activity-of-an-olive-oil-total-polyphenolic-fraction-and-hydroxytyrosol-from-a-greek-olea%C3%A2-europea-variety-in-endothelial-cells-and-myoblasts
#6
Paraskevi Kouka, Alexandros Priftis, Dimitrios Stagos, Apostolis Angelis, Panagiotis Stathopoulos, Nikos Xinos, Alexios-Léandros Skaltsounis, Charalampos Mamoulakis, Aristides M Tsatsakis, Demetrios A Spandidos, Demetrios Kouretas
Olive oil (OO) constitutes the basis of the Mediterranean diet, and it seems that its biophenols, such as hydroxytyrosol (HT) may scavenge free radicals, attracting distinct attention due to their beneficial effects in many pathological conditions, such as cancer. To the best of our knowedge, this is the first study in which the functional properties of an OO total polyphenolic fraction (TPF) and pure HT were examined in order to determine their antioxidant effects at a cellular level in endothelial cells and myoblasts...
July 20, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28730980/validation-of-spectrophotometric-methods-for-the-determination-of-total-polyphenol-and-total-flavonoid-content
#7
Petra Matić, Marija Sabljić, Lidija Jakobek
The aim of this study was to validate spectrophotometric methods for the measurement of total polyphenol (TP;via the Folin–Ciocalteu method) and total flavonoid (TF) content [via the aluminum chloride (AlCl₃) method]. Validation parameters of these methods were determined, including linearity, sensitivity, precision (intra-assay and intermediate), accuracy, LOD, and LOQ. For the validation process, groups of polyphenol standards were used, including phenolic acids (gallic, p-coumaric, caffeic, and chlorogenic acids), flavan-3-ols [(+)-catechin and procyanidins B1 and B2], flavonols (quercetin and quercetin-3-rutinoside), and dihydrochalcones (phloretin and phloretin-2-glucoside)...
July 20, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28729398/quercetin-targets-hnrnpa1-to-overcome-enzalutamide-resistance-in-prostate-cancer-cells
#8
Ramakumar Tummala, Wei Lou, Allen C Gao, Nagalakshmi Nadiminty
Prostate cancer remains dependent on androgen receptor signaling even after castration. Aberrant androgen receptor signaling in castration resistant prostate cancer is mediated by mechanisms such as alterations in the androgen receptor and activation of interacting signaling pathways. Clinical evidence confirms that resistance to the next generation anti-androgen, enzalutamide, may be mediated to a large extent by alternative splicing of the androgen receptor to generate constitutively active splice variants such as AR-V7...
July 20, 2017: Molecular Cancer Therapeutics
https://www.readbyqxmd.com/read/28728925/potential-anti-cancer-activity-of-7-o-pentyl-quercetin-efficient-membrane-targeted-kinase-inhibition-and-pro-oxidant-effect
#9
Nicola Sassi, Andrea Mattarei, Virginia Espina, Lance Liotta, Mario Zoratti, Cristina Paradisi, Lucia Biasutto
Quercetin is a redox-active plant-derived flavonoid with potential anticancer effects, stemming largely from its interaction with a number of proteins, and in particular from inhibition of pro-life kinases. To improve efficacy, we reasoned that a local increase in concentration of the compound at the level of cell membranes would result in a more efficient interaction with membrane-associated signaling kinases. We report here the synthesis of all five isomeric quercetin derivatives in which an n-pentyl group was linked via an ether bond to each hydroxyl of the flavonoid kernel...
July 17, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28728600/comparison-of-the-polyphenolic-profile-and-antibacterial-activity-of-the-leaves-fruits-and-flowers-of-rhododendron-ambiguum-and-rhododendron-cinnabarinum
#10
Abhinandan Shrestha, Ahmed Rezk, Inamullah Hakeem Said, Victoria von Glasenapp, Rachelle Smith, Matthias S Ullrich, Hartwig Schepker, Nikolai Kuhnert
BACKGROUND: Rhododendron species have been traditionally used in countries like China, Nepal, Russia and North America for treating human diseases. These species are known to be a good source of polyphenolic plant secondary plant metabolites. They are known to have beneficial health properties for humans and have been used to treat diseases like asthma, skin diseases. In this contribution we investigate the phenolic profile and antibacterial activity of extracts from several plant organs including for the first time from leaves of different development stages...
July 20, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28728453/incomplete-metabolism-of-phytoestrogens-by-gut-microbiota-from-children-under-the-age-of-three
#11
Pilar Gaya, Abel Sánchez-Jiménez, Ángela Peirotén, Margarita Medina, José Maria Landete
Phytoestrogens are plant-derived polyphenols with structural and functional similarities to mammalian oestrogens. The aim of this work was to study the metabolism of phytoestrogens by children's intestinal microbiota and to compare it with previous results in adults. Faecal samples of 24 healthy children were subjected to phytoestrogen fermentation assay. Only one child produced equol, while O-desmethylangolensin was found in all. Urolithin production was detected in 14 children and enterolactone in 10. Further comparison with the metabolism of phytoestrogens by adult intestinal microbiota reflected that glycitein, dihydrogenistein, urolithins D and E, enterolactone, secoisolariciresinol and arctigenin were the most important metabolites differentiating between adult and child microbial gut metabolism...
July 20, 2017: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/28727856/systematic-studies-of-the-interactions-between-a-model-polyphenol-compound-and-microbial-%C3%AE-glucosidases
#12
Viviam M da Silva, Juliana A P Sato, Juscemácia N Araujo, Fabio M Squina, João R C Muniz, Karin A Riske, Wanius Garcia
Lignin is a major obstacle for cost-effective conversion of cellulose into fermentable sugars. Non-productive adsorption onto insoluble lignin fragments and interactions with soluble phenols are important inhibition mechanisms of cellulases, including β-glucosidases. Here, we examined the inhibitory effect of tannic acid (TAN), a model polyphenolic compound, on β-glucosidases from the bacterium Thermotoga petrophila (TpBGL1 and TpBGL3) and archaeon Pyrococcus furiosus (PfBGL1). The results revealed that the inhibition effects on β-glucosidases were TAN concentration-dependent...
2017: PloS One
https://www.readbyqxmd.com/read/28727797/prophylactic-supplementation-of-resveratrol-is-more-effective-than-its-therapeutic-use-against-doxorubicin-induced-cardiotoxicity
#13
Heba Samy Shoukry, Hania Ibrahim Ammar, Laila Ahmed Rashed, Maha Balegh Zikri, Ashraf Ali Shamaa, Sahar Gamal Abou Elfadl, Ejlal Abu-Al Rub, Sekaran Saravanan, Sanjiv Dhingra
Resveratrol (RSV), a polyphenolic compound and naturally occurring phytoalexin, has been reported to exert cardio-protective effects in several animal studies. However, the outcome of initial clinical trials with RSV was less effective compared to pre-clinical studies. Therefore, RSV treatment protocols need to be optimized. In this study we evaluated prophylactic versus therapeutic effect of resveratrol (RSV) in mitigating doxorubicin (Dox)-induced cardiac toxicity in rats. To investigate prophylactic effects, RSV was supplemented for 2 weeks along with Dox administration...
2017: PloS One
https://www.readbyqxmd.com/read/28726741/magnolol-a-natural-polyphenol-attenuates-dextran-sulfate-sodium-induced-colitis-in-mice
#14
Ling Zhao, Hai-Tao Xiao, Huai-Xue Mu, Tao Huang, Ze-Si Lin, Linda L D Zhong, Guang-Zhi Zeng, Bao-Min Fan, Cheng-Yuan Lin, Zhao-Xiang Bian
Magnolol is a lignan with anti-inflammatory activity identified in Magnolia officinalis. Ulcerative colitis (UC), one of the types of inflammatory bowel disease (IBD), is a disease that causes inflammation and ulcers in the colon. To investigate the effect of magnolol in dextran sulfate sodium (DSS)-induced experimental UC model, male C57 mice were treated with 2% DSS drinking water for 5 consecutive days followed by intragastric administration with magnolol (5, 10 and 15 mg/kg) daily for 7 days. The results showed that magnolol significantly attenuated disease activity index, inhibited colonic shortening, reduced colonic lesions and suppressed myeloperoxidase (MPO) activity...
July 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28725872/antioxidant-and-lipoxygenase-activities-of-polyphenol-extracts-from-oat-brans-treated-with-polysaccharide-degrading-enzymes
#15
Nisita Ratnasari, Mallory Walters, Apollinaire Tsopmo
This study used polysaccharide degrading enzymes and protein precipitation to extract polyphenols from oats and to determine their bioactivity. Duplicate oat brans were treated with viscozyme (Vis), cellulase (Cel) or no enzyme (control, CTL) then, proteins were removed in one set (Vis1, Cel1, CTL1) and not in the other (Vis2, Cel2, CTL2). HPLC analyses showed that for cellulase treated brans, precipitation of proteins increased phenolic acids and avenanthramides by 14%. Meanwhile, a decreased of 67% and 20% respectively was found for viscozyme and control brans...
July 2017: Heliyon
https://www.readbyqxmd.com/read/28725146/lc-esi-ms-ms-profiling-of-phenolics-from-eleutherococcus-spp-inflorescences-structure-activity-relationship-as-antioxidants-inhibitors-of-hyaluronidase-and-acetylcholinesterase
#16
Daniel Załuski, Marta Olech, Rafał Kuźniewski, Robert Verpoorte, Renata Nowak, Helena D Smolarz
Nature is a source of many plant-based molecules used as pro- or drugs. Eleutherococcus species are native to Asia and the North Russia, and are traditionally used to treat various diseases. In turn, neither secondary metabolites of the species cultivated in the West Europe nor the bioactivity is known. No differences in the phenols and flavonoids content in the inflorescences were found. The richest in polyphenols was E. giraldii (5.18 mg/g), while in flavonoids it was E. gracilistylus (1.80 mg/g). Using LC-ESI-MS/MS, protocatechuic and trans-caffeic acids have been identified as the most abundant compounds in E...
July 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28724656/dietary-flavonoid-intake-reduces-the-risk-of-head-and-neck-but-not-esophageal-or-gastric-cancer-in-us-men-and-women
#17
Lucy Sun, Amy F Subar, Claire Bosire, Sanford M Dawsey, Lisa L Kahle, Thea P Zimmerman, Christian C Abnet, Ruth Heller, Barry I Graubard, Michael B Cook, Jessica L Petrick
Background: Flavonoids are bioactive polyphenolic compounds found in fruits, vegetables, and beverages of plant origin. Previous studies have shown that flavonoid intake reduces the risk of certain cancers; however, few studies to date have examined associations of flavonoids with upper gastrointestinal cancers or used prospective cohorts.Objective: Our study examined the association between intake of flavonoids (anthocyanidins, flavan-3-ols, flavanones, flavones, flavonols, and isoflavones) and risk of head and neck, esophageal, and gastric cancers...
July 19, 2017: Journal of Nutrition
https://www.readbyqxmd.com/read/28723689/a-randomized-controlled-trial-of-green-tea-beverages-on-the-in-vivo-radical-scavenging-activity-in-human-skin
#18
Inna Megow, Maxim E Darvin, Martina C Meinke, Jürgen Lademann
BACKGROUND: Oxidative stress plays an important role in the pathogenesis of various skin diseases. Thus, the antioxidant network of the skin relies on the uptake of exogenous antioxidants to ensure cell protection against radical formation. Green tea is one of the main sources of polyphenolic antioxidant compounds, but only few data are available on its cutaneous antioxidant effects. METHODS: The radical scavenging properties of Benifuuki and Yabukita green tea were investigated in the human skin...
July 20, 2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28723615/nanoformulations-of-curcumin-an-emerging-paradigm-for-improved-remedial-application
#19
REVIEW
Meeta Gera, Neelesh Sharma, Mrinmoy Ghosh, Do Luong Huynh, Sung Jin Lee, Taesun Min, Taeho Kwon, Dong Kee Jeong
Curcumin is a natural polyphenol and essential curcuminoid derived from the rhizome of the medicinal plant Curcuma longa (L.) is universally acknowledged as "Wonder drug of life". It is a vital consumable and restorative herb, commonly keened for several ailments such as cancer, arthritis, pain, bruises, gastrointestinal quandaries, swelling and much more. Despite its enormous curative potential, the poor aqueous solubility and consequently, minimal systemic bioavailability with rapid degradation are some of the major factors which restrict the utilization of curcumin at medical perspective...
July 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28723164/differentiation-and-identification-of-cacha%C3%A3-a-wood-extracts-using-peptide-based-receptors-and-multivariate-data-analysis
#20
Eman Ghanem, Saazina Afsah, Parisa N Fallah, Alexandria Lawrence, Elise LeBovidge, Sneha Raghunathan, Dominic Rago, Michelle A Ramirez, Mitchell Telles, Michelle Winkler, Bailey Schumm, Kiran Makhnejia, David Portillo, Rafael C Vidal, Allison Hall, Debbie Yeh, Holly Judkins, Alexandre Ataide da Silva, Douglas W Franco, Eric V Anslyn
It is becoming increasingly important to differentiate complex mixtures, especially in forensics. Cachaça, the most popular alcoholic beverage in Brazil, is made from distilled and fermented sugar cane juice. It contains a mixture of naturally occurring polyphenols known as tannins, whose composition is dictated by the type of wood used to age the beverage. These tannins can be differentiated in an Indicator Displacement Assay (IDA) using peptide-based ternary sensing ensembles. This investigation demonstrates a technique for fingerprinting the identity of the woods used to age cachaças...
May 26, 2017: ACS Sensors
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