keyword
MENU ▼
Read by QxMD icon Read
search

kaempferol

keyword
https://www.readbyqxmd.com/read/28211698/demethylation-of-polymethoxyflavones-by-human-gut-bacterium-blautia-sp-mrg-pmf1
#1
Supawadee Burapan, Mihyang Kim, Jaehong Han
Polymethoxyflavones (PMFs) were biotransformed to various demethylated metabolites in the human intestine by the PMF-metabolizing bacterium, Blautia sp. MRG-PMF1. Because the newly formed metabolites can have different biological activities, the pathways and regioselectivity of PMF bioconversion were investigated. Using an anaerobic in vitro study, 12 PMFs, 5,7-dimethoxyflavone (5,7-DMF), 5-hydroxy-7-methoxyflavone (5-OH-7-MF), 3,5,7-trimethoxyflavone (3,5,7-TMF), 5-hydroxy-3,7-dimethoxyflavone (5-OH-3,7-DMF), 5,7,4'-trimethoxyflavone (5,7,4'-TMF), 5-hydroxy-7,4'-dimethoxyflavone (5-OH-7,4'-DMF), 3,5,7,4'-tetramethoxyflavone (3,5,7,4'-TMF), 5-hydroxy-3,7,4'-trimethoxyflavone (5-OH-3,7,4'-TMF), 5,7,3',4'-tetramethoxyflavone (5,7,3',4'-TMF), 3,5,7,3',4'-pentamethoxyflavone (3,5,7,3',4'-PMF), 5-hydroxy-3,7,3',4'-tetramethoxyflavone (5-OH-3,7,3',4'-TMF), and 5,3'-dihydroxy-3,7,4'-trimethoxyflavone (5,3'-diOH-3,7,4'-TMF), were converted to chrysin, apigenin, galangin, kaempferol, luteolin, and quercetin after complete demethylation...
February 17, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28203242/sunlight-modulates-fruit-metabolic-profile-and-shapes-the-spatial-pattern-of-compound-accumulation-within-the-grape-cluster
#2
Noam Reshef, Natasha Walbaum, Nurit Agam, Aaron Fait
Vineyards are characterized by their large spatial variability of solar irradiance (SI) and temperature, known to effectively modulate grape metabolism. To explore the role of sunlight in shaping fruit composition and cluster uniformity, we studied the spatial pattern of incoming irradiance, fruit temperature and metabolic profile within individual grape clusters under three levels of sunlight exposure. The experiment was conducted in a vineyard of Cabernet Sauvignon cv. located in the Negev Highlands, Israel, where excess SI and midday temperatures are known to degrade grape quality...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28199969/astragalin-induced-cell-death-is-caspase-dependent-and-enhances-the-susceptibility-of-lung-cancer-cells-to-tumor-necrosis-factor-by-inhibiting-the-nf-%C3%B0%C2%BAb-pathway
#3
Minghui Chen, Fangfang Cai, Daolong Zha, Xueshi Wang, Wenjing Zhang, Yan He, Qilai Huang, Hongqin Zhuang, Zi-Chun Hua
Flavonoids are naturally occurring polyphenolic compounds and are among the most promising anticancer agents. Here, we demonstrate that the flavonoid astragalin (AG), also known as kaempferol-3-O-β-D-glucoside, induces cell death. This was prevented by the caspase inhibitors z-DEVD-FMK and z-LEHD-FMK. AG-induced cell death was associated with an increase in the Bax:Bcl-2 ratio and amplified by the inhibition of extracellular signal-regulated kinase (ERK)-1/2 and Akt signaling. Meanwhile, AG suppressed LPS-induced NF-κB activation...
February 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/28192760/competitive-binding-experiments-can-reduce-the-false-positive-results-of-affinity-based-ultrafiltration-hplc-a-case-study-for-identification-of-potent-xanthine-oxidase-inhibitors-from-perilla-frutescens-extract
#4
Zhiqiang Wang, Shin Hwa Kwon, Seung Hwan Hwang, Young-Hee Kang, Jae-Yong Lee, Soon Sung Lim
The purpose of this study was to assess the possibility of using competitive binding experiments with ultrafiltration-HPLC analysis to identify potent xanthine oxidase (XO) inhibitors from the Perilla frutescens extract as an attempt to reduce the number of false positive results. To isolate the enzyme-ligand complex from unbound compounds, the P. frutescens extract was either incubated in the absence of XO, in the presence of XO, or with the active site blocked XO before the ultrafiltration was performed. Allopurinaol was used as the XO active site blocker...
February 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28182841/bioactive-components-and-antioxidant-capacity-of-fruits-from-nine-sorbus-genotypes
#5
Maja Mikulic-Petkovsek, Boris Krska, Biljana Kiprovski, Robert Veberic
In this study, biochemical profile of fruits of 9 Sorbus genotypes was analyzed. The content of total sugars ranged from 69.7 g/kg ('Titan') to 217.5 g/kg (Sorbus torminalis) and total organic acids from 17.7 g/kg ('Businka') to 40.2 g/kg (S. torminalis). The highest content of total anthocyanins had 'Burka' (871 mg/kg FW) and 'Businka' (856 mg/kg FW). Quercetin derivatives represented more than 95% of total flavonols. 'Alaja krupnaja' had 3.5- to 29-fold higher rutin content than other analyzed genotypes. S...
February 9, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28178217/flavonoid-composition-and-antitumor-activity-of-bee-bread-collected-in-northeast-portugal
#6
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/28176198/constituents-of-leaves-from-bauhinia-curvula-benth-exert-gastroprotective-activity-in-rodents-role-of-quercitrin-and-kaempferol
#7
Ana Paula Beber, Priscila de Souza, Thaise Boeing, Lincon Bordignon Somensi, Luísa Nathália Bolda Mariano, Benhur Judah Cury, Ligia Moura Burci, Cristiane Bezerra da Silva, Euclésio Simionatto, Sérgio Faloni de Andrade, Luísa Mota da Silva
The Bauhinia genus is known as "Pata-de-Vaca" and a wide variety of these species are used in Brazilian folk medicine due to their gastroprotective properties. This study aimed to investigate the antiulcer efficacy of the hydroalcoholic extract from B. curvula (HEBC) leaves, as well as its semi-purified fraction (SPFr) and the contribution of their phytochemicals constituents for this effect. For that, ethanol 60%/HCl 0.3 M- and indomethacin-induced gastric ulcer were performed in rodents. Gastric ulcerated tissues were processed for histological, histochemical and biochemical analysis...
February 7, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/28164200/contribution-of-the-phenolic-composition-to-the-antioxidant-anti-inflammatory-and-antitumor-potential-of-equisetum-giganteum-l-and-tilia-platyphyllos-scop
#8
Inés Jabeur, Natália Martins, Lillian Barros, Ricardo C Calhelha, Josiana Vaz, Lotfi Achour, Celestino Santos-Buelga, Isabel C F R Ferreira
Naturally-occurring phytochemicals have received pivotal attention in the last few years, due to the increasing evidence of biological activities. Thus, in the present study, the antioxidant, anti-inflammatory and antitumor potentials of hydroethanolic extracts rich in phenolic compounds obtained from Equisetum giganteum L. and Tilia platyphyllos Scop. were assessed and directly correlated with their content of phenolic compounds, by using HPLC-DAD-ESI/MS analysis. T. platyphyllos showed the higher bioactive potential, evaluated in terms of antioxidant (radical scavenging effects - 105 μg mL(-1), reducing power - 123 μg mL(-1), β-carotene bleaching inhibition - 167 μg mL(-1), and lipid peroxidation inhibition - 56 μg mL(-1)), anti-inflammatory (225 μg mL(-1) inhibited 50% of nitric oxide production) and antitumor (breast - 224 μg mL(-1); lung - 247 μg mL(-1); cervical - 195 μg mL(-1) and hepatocellular - 173 μg mL(-1) carcinoma cells) activity, without having cytotoxic effects (>400 μg mL(-1))...
February 6, 2017: Food & Function
https://www.readbyqxmd.com/read/28159246/low-concentration-of-sodium-bicarbonate-improves-the-bioactive-compound-levels-and-antioxidant-and-%C3%AE-glucosidase-inhibitory-activities-of-tartary-buckwheat-sprouts
#9
Peiyou Qin, Aichun Wei, Degang Zhao, Yang Yao, Xiushi Yang, Baoqing Dun, Guixing Ren
This study aimed to investigate the effects of different concentrations of sodium bicarbonate (NaHCO3) on the accumulation of flavonoids, total phenolics and d-chiro-inositol (DCI), as well as the antioxidant and α-glucosidase inhibitory activities, in tartary buckwheat sprouts. Treatment with low concentrations of NaHCO3 (0.05, 0.1, and 0.2%) resulted in an increase in flavonoids, total phenolic compounds and DCI concentrations, and improved DPPH radical-scavenging and α-glucosidase inhibition activities compared with the control (0%)...
June 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28143765/functional-expression-of-plant-derived-o-methyltransferase-flavanone-3-hydroxylase-and-flavonol-synthase-in-corynebacterium-glutamicum-for-production-of-pterostilbene-kaempferol-and-quercetin
#10
Nicolai Kallscheuer, Michael Vogt, Michael Bott, Jan Marienhagen
Plant polyphenols receive significant attention due to their anti-oxidative and health-promoting properties, and several microorganisms are currently engineered towards producing these valuable compounds. Previously, Corynebacterium glutamicum has been engineered for synthesizing polyphenol core structures such as the stilbene resveratrol and the (2S)-flavanone naringenin. Decoration of these compounds by O-methylation or hydroxylation would provide access to polyphenols of even higher commercial interest. In this study, introduction of a heterologous O-methyltransferase into a resveratrol-producing C...
January 28, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28135851/flavonoids-with-hepatoprotective-activity-from-the-leaves-of-cleome-viscosa-l
#11
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/28115379/differential-gene-expression-on-lactobacillus-plantarum-wcfs1-in-response-to-phenolic-compounds-unravels-new-genes-involved-in-tannin-degradation
#12
Inés Reverón, Natalia Jiménez, José Antonio Curiel, Elena Peñas, Félix López de Felipe, Blanca de Las Rivas, Rosario Muñoz
: Lactobacillus plantarum is a lactic acid bacterium able to degrade food tannins by the subsequent action of tannase and gallate decarboxylase enzymes. In the L. plantarum genome the gene encoding the catalytic subunit of gallate decarboxylase (lpdC or lp_2945) is only 6.5 kb distant relative to the gene encoding inducible tannase (tanBLp or lp_2956). This genomic context suggests a concomitant activity and regulation of both enzymatic activities. Reverse transcription analysis revealed that B (lpdB or lp_0271) and D (lpdD or lp_0272) subunits of gallate decarboxylase are cotranscribed, whereas C subunit (lpdC or lp_2945) is cotranscribed with a transport protein (gacP or lp_2943)...
January 23, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28114836/a-new-diacetylated-flavonol-triglycoside-from-the-aerial-parts-of-actinidia-polygama
#13
Ahmed Shah Syed, Je-Seung Jeon, Chul Young Kim
Phytochemical investigation of a methanolic extract of aerial parts Actinidia polygama Miq. led to the isolation of one new diacetylated flavonol triglycoside, kaempferol 3-O-[α-L-rhamnopyranosyl(1→3)-(4-O-acetyl)-O-α-L-rhamnopyranosyl(1→6)-(2-Oacetyl)-O-β-D-galactopyranoside] (1) along with 12 known compounds (2-13). The chemical structures were determined using their spectroscopic data including 1D and 2D NMR. To the best of our knowledge, this is the first time that compounds 2, 4, 6, 7, 8, 9, 12 and 13 are isolated from this plant...
January 23, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28110221/simultaneous-determination-of-eight-flavonoids-in-plasma-using-lc-ms-ms-and-application-to-a-pharmacokinetic-study-after-oral-administration-of-pollen-typhae-extract-to-rats
#14
Xie-An Yu, John Teye Azietaku, Jin Li, Jun Cao, Mingrui An, Jun He, Xiu-Mei Gao, Yan-Xu Chang
A sensitive, reliable and validated LC-MS/MS method was developed to determine the presence of eight flavonoids (catechin, typhaneoside, isorhamnetin-3-O-neohesperidoside, astragalin, isorhamnetin-3-O-β-d-glucoside, naringenin, kaempferol and isorhamnetin) in rat plasma. Puerarin was selected as the internal standard. Precipitation of the protein method with acetonitrile was used to extract these flavonoids from the rat plasma samples. The analysis was carried out on an Eclipse plus C18 column (4.6 mm×100mm, 1...
January 15, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28103857/ameliorative-potential-of-alstonia-scholaris-linn-r-br-against-chronic-constriction-injury-induced-neuropathic-pain-in-rats
#15
Hasandeep Singh, Rohit Arora, Saroj Arora, Balbir Singh
BACKGROUND: Alstonia scholaris commonly known as 'Saptaparni' is an Indian traditional medicinal plant used in Ayurveda. It is commonly used to treat various disorders like asthma, bronchitis, diarrhea, dysentery and malaria. In folklore medicine the milky juice of the plant is applied on wounds and ulcers to treat pain, ear ache and also in rheumatic pains. AIM: The present study was designed to investigate the potential of A. scholaris R. Br. in chronic constriction injury of sciatic nerve (CCI) induced neuropathic pain in rats...
January 19, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28098826/hair-growth-promoting-and-anticancer-effects-of-p21-activated-kinase-1-pak1-inhibitors-isolated-from-different-parts-of-alpinia-zerumbet
#16
Nozomi Taira, Binh Cao Quan Nguyen, Shinkichi Tawata
PAK1 (p21-activated kinase 1) is an emerging target for the treatment of hair loss (alopecia) and cancer; therefore, the search for PAK1 blockers to treat these PAK1-dependent disorders has received much attention. In this study, we evaluated the anti-alopecia and anticancer effects of PAK1 inhibitors isolated from Alpinia zerumbet (alpinia) in cell culture. The bioactive compounds isolated from alpinia were found to markedly promote hair cell growth. Kaempferol-3-O-β-d-glucuronide (KOG) and labdadiene, two of the isolated compounds, increased the proliferation of human follicle dermal papilla cells by approximately 117%-180% and 132%-226%, respectively, at 10-100 μM...
January 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product 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...
January 14, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28088385/flavonoid-derivative-fla-cn-inhibited-adipocyte-differentiation-via-activating-ampk-and-up-regulating-microrna-27-in-3t3-l1-cells
#19
Chun-Chun Gan, Tian-Wen Ni, Yang Yu, Nan Qin, Ying Chen, Mei-Na Jin, Hong-Quan Duan
Fla-CN (3-O-[(E)-4-(4-cyanophenyl)-2-oxobut-3-en-1-yl] kaempferol) is a semi-synthesized flavonoid derivative of tiliroside which exhibited anti-diabetic effect in vivo. Our previous study revealed the role of Fla-CN in anti-obesity and anti-diabetes in vivo, but the underlying mechanism remained to be addressed. The present study aimed to investigate the mechanism of anti-adipogenesis in vitro. Fla-CN markedly inhibited intracellular lipid accumulation in a dose-dependent manner, and the inhibitory effect was mainly limited to the early stage of adipocyte differentiation in vitro...
January 12, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28073097/moringa-oleifera-a-species-with-potential-analgesic-and-anti-inflammatory-activities
#20
Claudia Lizbeth Martínez-González, Laura Martínez, Efraín J Martínez-Ortiz, María Eva González-Trujano, Myrna Déciga-Campos, Rosa Ventura-Martínez, Irene Díaz-Reval
Moringa oleifera has long been used in large demand in folk medicine to treat pain. The present study was undertaken to examine the antinociceptive and anti-inflammatory spectrum of M. oleifera leaf extracts discriminating the constituents' nature by using different kind of experimental models in rats. Pharmacological evaluation of a non-polar and/or polar extracts at several doses (30-300mg/kg, p.o.) was explored through experimental nociception using formalin test, carrageenan-induced paw edema and arthritis with subcutaneous injection of collagen in rats...
January 7, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
keyword
keyword
17158
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"