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https://www.readbyqxmd.com/read/28818532/myricetin-solid-lipid-nanoparticles-stability-assurance-from-system-preparation-to-site-of-action
#1
Dina M Gaber, Noha Nafee, Osama Y Abdallah
Myricetin - a natural flavonoid - has attracted a great interest due to its antioxidant and free-radical scavenging potential. However, its physicochemical instability critically impairs its dosage form design, evaluation and administration. In an attempt to protect from degradation, MYR was encapsulated into Gelucire-based solid lipid nanoparticles (SLNs). The impact of medium pH, processing temperature and different additives on the drug degradation either in free or nanoencapsulated form was assessed. MYR stability was further monitored in essential biorelevant fluids...
August 14, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28808377/anti-inflammatory-potential-of-petiveria-alliacea-on-activated-raw264-7-murine-macrophages
#2
Rosa Martha Perez Gutierrez, Carlos Hoyo-Vadillo
BACKGROUND: Defense and protection to multiple harmful stimuli are the inflammation, when is self-amplified and uncontrolled is the basis of the pathogenesis of a wide variety of inflammatory illness. The aim of this study was to evaluate if Petiveria alliacea could attenuate inflammation in a murine model of RAW264 macrophages the involved model and its involved mechanism. MATERIALS AND METHODS: The ethanol extract from P. alliacea was precipitated with water and supernatant was used for this study (PW)...
July 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28802134/investigating-the-features-in-differential-absorbance-spectra-of-nom-associated-with-metal-ion-binding-a-comparison-of-experimental-data-and-td-dft-calculations-for-model-compounds
#3
Mingquan Yan, Xuze Han, Chenyang Zhang
In this study, seven model compounds containing typical functional groups (phenolic and carboxylic groups) present in nature organic matter (NOM) were used to ascertain the nature of the characteristic bands in differential absorbance spectra (DAS) of NOM that are induced by metal ion binding. Some similarities were found between the DAS of the examined model compounds, caffeic acid, ferulic acid, sinapic acid, terephthalic acid, isophthalic acid, esculetin and myricetin and those of NOM. The binding of Cu(II) with carboxylic group might produce two peaks, A1 and A2, while the binding of Cu(II) with phenolic group might produce all four Gaussian peaks, from A1 to A4 displayed in the DAS of NOM...
August 5, 2017: Water Research
https://www.readbyqxmd.com/read/28766621/detailed-phytochemical-characterization-and-bioactive-properties-of-myrtus-nivelii-batt-trab
#4
Wahiba Rached, Malika Bennaceur, Lillian Barros, Ricardo C Calhelha, Sandrina Heleno, Maria José Alves, Ana Maria Carvalho, Abderrazak Marouf, Isabel C F R Ferreira
The endemic Algerian myrtle, Myrtus nivelii Batt & Trab., was evaluated for its bioactive properties, such as antioxidant, anti-inflammatory, cytotoxic and antibacterial activities, and correlated with the individual phenolic compounds identified in its crude aqueous extract and subsequent organic fractions (ethyl acetate and butanol). Flavonols, such as myricetin, kaempferol and quercetin glycoside derivatives, were the major phenolic compounds found, along with the presence of ellagitannins. The ethyl acetate fraction contained the highest amount of phenolic compounds, followed by the butanol fraction and, finally, the crude aqueous extract...
August 2, 2017: Food & Function
https://www.readbyqxmd.com/read/28757593/sechium-edule-jacq-swartz-a-new-cultivar-with-antiproliferative-potential-in-a-human-cervical-cancer-hela-cell-line
#5
Sandra Salazar-Aguilar, Lucero Del Mar Ruiz-Posadas, Jorge Cadena-Iñiguez, Marcos Soto-Hernández, Edelmiro Santiago-Osorio, Itzen Aguiñiga-Sánchez, Ana Rocío Rivera-Martínez, Juan Francisco Aguirre-Medina
The Sechium edule Perla Negra cultivar is a recently-obtained biological material whose progenitors are S. edule var. nigrum minor and S. edule var. amarus silvestrys, the latter of which has been reported to have antiproliferative activity against the HeLa P-388 and L-929 cancer cell lines. The present study aimed to determine if the methanolic extract of the fruit of the Perla Negra cultivar had the same biological activity. The methanolic extract was phytochemically characterized by thin layer chromatography (TLC) and column chromatography (CC), identifying the terpenes and flavonoids...
July 25, 2017: Nutrients
https://www.readbyqxmd.com/read/28750545/contribution-of-individual-flavonoids-in-lysimachia-species-to-the-antioxidant-capacity-based-on-hplc-dpph-assay
#6
Anita Toth, Eszter Riethmuller, Krisztina Vegh, Agnes Alberti, Szabolcs Beni, Agnes Kery
Quantitative phytochemical characterisation of the chief flavonoid aglycones in the hydrolysed Lysimachia extracts revealed the dominance of kaempferol, quercetin and myricetin in L. vulgaris, L. nummularia, L. punctata, L. christinae, L. ciliata and L. clethroides, respectively. Due to the significant radical scavenging capacity of the samples, the contribution of the individual aglycones to the total antioxidant activity became of interest. Therefore, a HPLC method coupled to pre-column DPPH scavenging assay was developed...
July 27, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28745105/honey-flavonoids-inhibit-hoatp2b1-and-hoatp1a2-transporters-and-hoatp-mediated-rosuvastatin-cell-uptake-in-vitro
#7
Lucie Navrátilová, Jana Ramos Mandíková, Petr Pávek, Přemysl Mladěnka, František Trejtnar
1. Some flavonoids contained in the common diet have been shown to interact with important membrane uptake transporters, including organic anion transporting polypeptides (OATPs). OATP2B1 and OATP1A2 expressed in the apical membrane of human enterocytes may significantly contribute to the intestinal absorption of drugs, e.g. statins. This study is aimed at an evaluation of the inhibitory potency of selected honey flavonoids (namely galangin, myricetin, pinocembrin, pinobanksin, chrysin, fisetin) towards hOATP2B1 and hOATP1A2 as well as at examining their effect on the cellular uptake of the known OATP substrate rosuvastatin...
July 26, 2017: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/28740165/myricetin-improves-endurance-capacity-and-mitochondrial-density-by-activating-sirt1-and-pgc-1%C3%AE
#8
Hoe-Yune Jung, Dongyeop Lee, Hye Guk Ryu, Bo-Hwa Choi, Younghoon Go, Namgyu Lee, Dohyun Lee, Heehwa G Son, Jongsu Jeon, Seong-Hoon Kim, Jong Hyuk Yoon, Seon-Min Park, Seung-Jae V Lee, In-Kyu Lee, Kwan Yong Choi, Sung Ho Ryu, Kazunari Nohara, Seung-Hee Yoo, Zheng Chen, Kyong-Tai Kim
Robust mitochondrial respiration provides energy to support physical performance and physiological well-being, whereas mitochondrial malfunction is associated with various pathologies and reduced longevity. In the current study, we tested whether myricetin, a natural flavonol with diverse biological activities, may impact mitochondrial function and longevity. The mice were orally administered myricetin (50 mg/kg/day) for 3 weeks. Myricetin significantly potentiated aerobic capacity in mice, as evidenced by their increased running time and distance...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720971/determination-of-anthocyanins-and-non-anthocyanin-polyphenols-by-ultra-performance-liquid-chromatography-electrospray-ionization-mass-spectrometry-uplc-esi-ms-in-jussara-euterpe-edulis-extracts
#9
Gláucia S Vieira, Anna S F Marques, Mariana T C Machado, Vanessa M Silva, Miriam D Hubinger
This work aimed to propose two analytical methods for the quantitative and qualitative analysis of major anthocyanins and non-anthocyanin phenolic compounds in jussara (Euterpe edulis) extracts, using ultra performance liquid chromatography-mass spectrometry. These methods were evaluated for selectivity, precision, linearity, detection and quantification limits. The complete separation of 5 anthocyanins and 22 non-anthocyanins polyphenols was achieved in 4.5 and 7 min, respectively. Limits of detection ranged from 0...
June 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28716425/characterization-and-quantification-of-flavonoids-and-organic-acids-over-fruit-development-in-american-cranberry-vaccinium-macrocarpon-cultivars-using-hplc-and-apci-ms-ms
#10
Yifei Wang, Jennifer Johnson-Cicalese, Ajay P Singh, Nicholi Vorsa
Cranberry flavonoids, including anthocyanins, flavonol glycosides and proanthocyanidins, and organic acids were characterized and quantified by HPLC and LC-MS/MS during fruit development and ripening in eight cranberry cultivars. Anthocyanin biosynthesis initiated at early fruit development and reached highest level in mature fruit, with significant differences between cultivars. Major flavonol glycosides, including the most abundant quercetin-3-galactoside and myricetin-3-galactoside, showed consistent concentrations during the season with moderate fluctuation, and were at similar levels in mature fruits of the eight cultivars...
September 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28712963/anti-quorum-sensing-activity-of-pistacia-atlantica-against-pseudomonas-aeruginosa-pao1-and-identification-of-its-bioactive-compounds
#11
H Kordbacheh, F Eftekhar, S N Ebrahimi
Pseudomonas aeruginosa is a multidrug resistant opportunistic pathogen and an important cause of nosocomial infections. Quorum-sensing (QS) is a process in which bacterial cell-cell communication can regulates production of many virulence factors including pigment formation and the ability to form biofilm which is essential for establishment of chronic infections. We examined the inhibitory effect of Pistacia atlantica (Anacardiaceae) methanolic leaf extract and its bioactive components on biofilm formation and pigment production by P...
July 14, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28700665/solution-conformations-of-zika-ns2b-ns3pro-and-its-inhibition-by-natural-products-from-edible-plants
#12
Amrita Roy, Liangzhong Lim, Shagun Srivastava, Yimei Lu, Jianxing Song
The recent Zika viral (ZIKV) epidemic has been associated with severe neurological pathologies such as neonatal microcephaly and Guillain-Barre syndrome but unfortunately no vaccine or medication is effectively available yet. Zika NS2B-NS3pro is essential for the proteolysis of the viral polyprotein and thereby viral replication. Thus NS2B-NS3pro represents an attractive target for anti-Zika drug discovery/design. Here, we have characterized the solution conformations and catalytic parameters of both linked and unlinked Zika NS2B-NS3pro complexes and found that the unlinked complex manifested well-dispersed NMR spectra...
2017: PloS One
https://www.readbyqxmd.com/read/28675777/effects-of-myricetin-containing-ethanol-solution-on-high-fat-diet-induced-obese-rats
#13
Hsueh-Chin Chao, Pei-Feng Tsai, Sheng-Chi Lee, Yeong-Shenn Lin, Ming-Chang Wu
Myricetin is a natural flavonol widely occurring in wines. Many beneficial effects of myricetin in alcoholic beverages have been reported before, but never including anti-obesity. In the present study, we fed obese male Sprague-Dawley rats with ethanol solutions containing various concentrations of myricetin and found that myricetin may maintain the food intake while reduce the weight-gain, feed efficiency, level of blood lipids, adipocyte size, and weight and size of the perirenal and epididymal adipose tissues (P < 0...
July 4, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28668616/influence-of-flavonols-and-quercetin-derivative-compounds-on-ma-10-leydig-cells-steroidogenic-genes-expressions
#14
Michelle Cormier, Firas Ghouili, Pauline Roumaud, Luc J Martin, Mohamed Touaibia
Androgen are mainly synthesized and secreted from testicular Leydig cells and play critical roles in testis development, normal masculinization, spermatogenesis, and male fertility. The rate-limiting step in testosterone biosynthesis involves the import of cholesterol inside mitochondria by the steroidogenic acute regulatory (Star) protein. Cholesterol is then converted to pregnenolone by the steroidogenic enzyme Cyp11a1, followed by a chemical transformation to testosterone using other steroidogenic enzymes...
June 28, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28660450/evaluating-water-deficit-and-glyphosate-treatment-on-the-accumulation-of-phenolic-compounds-and-photosynthesis-rate-in-transgenic-codonopsis-lanceolata-siebold-zucc-trautv-over-expressing-%C3%AE-tocopherol-methyltransferase-%C3%AE-tmt-gene
#15
Bimal Kumar Ghimire, Na-Young Son, Seung-Hyun Kim, Chang Yeon Yu, Ill-Min Chung
The effect of water stress and herbicide treatment on the phenolic compound concentration and photosynthesis rate in transgenic Codonopsis lanceolata plants over-expressing the γ-tmt gene was investigated and compared to that in control non-transgenic C. lanceolata plants. The total phenolic compound content was investigated using high-performance liquid chromatography combined with diode array detection in C. lanceolata seedlings 3 weeks after water stress and treatment with glyphosate. Changes in the composition of phenolic compounds were observed in leaf and root extracts from transformed C...
July 2017: 3 Biotech
https://www.readbyqxmd.com/read/28635261/novel-protein-based-solid-biosensor-for-determining-pro-oxidant-activity-of-phenolic-compounds
#16
Esin Akyüz, Kevser Sözgen Başkan, Esma Tütem, Reşat Apak
To develop a protein-based biosensor measuring the pro-oxidant activities of phenolic compounds, egg white proteins were precipitated with calcium chloride to obtain an insoluble calcium proteinate complex. This biosensor was used for the determination of Cu(II)-induced pro-oxidant activity of antioxidants such as gallic acid, catechin, epicatechin, quercetin, chlorogenic acid and myricetin, and ascorbic acid. This assay involved the reduction of Cu(II) ions to Cu(I) by antioxidant compounds (simultaneously giving rise to reactive oxygen species) and binding of the formed Cu(I) to the solid biosensor...
July 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28629861/flavonoids-determine-the-rate-of-fibrillogenesis-and-structure-of-collagen-type-i-fibrils-in-vitro
#17
Yuri A Kim, Yury S Tarahovsky, Sergei G Gaidin, Elena A Yagolnik, Eugeny N Muzafarov
Collagen fibrils are produced from collagen monomers not only in vivo, but also in vitro. The ability to have an influence on the structure and properties of fibrils may find medical application and can be useful for controlling the formation of collagen gels and sheets in tissue engineering. Here we investigated the influence of flavonoids, distinguished by the number of hydroxyl groups in the B-ring, on the formation of collagen fibrils. A correlation was found between the number of hydroxyl groups, lipophilicity of molecules and their ability to influence the fibril formation...
June 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28620169/structural-insight-for-the-recognition-of-g-quadruplex-structure-at-human-c-myc-promoter-sequence-by-flavonoid-quercetin
#18
Arpita Tawani, Subodh Kumar Mishra, Amit Kumar
Small molecule ligands that could stabilize G-quadruplex structure formed at the promoter region of human c-myc oncogene will regulate its expression in cancer cells. Flavonoids, a group of naturally available small molecule, have been known for their various promising effects on human health. In present study, we have performed detailed biophysical studies for the interaction of human c-myc G-quadruplex DNA with nine representative flavonoids: Luteolin, Quercetin, Rutin, Genistein, Kaempferol, Puerarin, Hesperidin, Myricetin and Daidzein...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28619513/myricetin-ameliorates-scopolamine-induced-memory-impairment-in-mice-via-inhibiting-acetylcholinesterase-and-down-regulating-brain-iron
#19
Beiyun Wang, Yuan Zhong, Chengjie Gao, Jingbo Li
The aim of our study was to investigate to investigate the effect of myricetin on Alzheimer's disease (AD) and its underlying mechanisms. In our study, Myricetin effectively attenuated Fe(2+)-induced cell death in SH-SY5Y cells in vitro. In a mouse model of AD, myricetin treatment significantly reversed scopolamine-induced cognitive deficits deriving from a novel action of inhibiting acetylcholinesterase (AChE) and down-regulating brain iron. Furthermore, Myricetin treatment reduced oxidative damage and increased antioxidant enzymes activity in mice...
August 19, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28588737/myricetin-induces-apoptosis-and-enhances-chemosensitivity-in-ovarian-cancer-cells
#20
Ai-Wen Zheng, Ya-Qing Chen, Ling-Qin Zhao, Jian-Guo Feng
Ovarian cancer is the most lethal type of gynecological cancer and is the fifth leading cause of cancer-associated mortality in females globally. The majority of patients with ovarian cancer suffer from recurrent, progressive disease, due to the acquisition of a resistance phenotype towards various conventional chemotherapy drugs. Although paclitaxel has been demonstrated to be effective against ovarian tumors, there have been reports of the development of a resistant phenotype against Taxol(®) treatment. The multidrug resistance (MDR)-1/P-glycoprotein has previously been demonstrated to be associated with the acquisition of paclitaxel resistance in certain ovarian tumors...
June 2017: Oncology Letters
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