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Epicatechin

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https://www.readbyqxmd.com/read/29355598/biological-activities-of-epicatechin-and-epicatechin-containing-foods-focus-on-cardiovascular-and-neuropsychological-health
#1
REVIEW
Iveta Bernatova
Recent studies have suggested that certain (-)-epicatechin-containing foods have a blood pressure-lowering capacity. The mechanisms underlying (-)-epicatechin action may help prevent oxidative damage and endothelial dysfunction, which have both been associated with hypertension and certain brain disorders. Moreover, (-)-epicatechin has been shown to modify metabolic profile, blood's rheological properties, and to cross the blood-brain barrier. Thus, (-)-epicatechin causes multiple actions that may provide unique synergy beneficial for cardiovascular and neuropsychological health...
January 17, 2018: Biotechnology Advances
https://www.readbyqxmd.com/read/29355558/-epicatechin-stimulates-mitochondrial-biogenesis-and-cell-growth-in-c2c12-myotubes-via-the-g-protein-coupled-estrogen-receptor
#2
Aldo Moreno-Ulloa, Adriana Miranda-Cervantes, Alexei Licea-Navarro, Christina Mansour, Ernesto Beltrán-Partida, Luis Donis-Maturano, Hilda Carolina Delgado De la Herrán, Francisco Villarreal, Carolina Álvarez-Delgado
We have reported on the capacity of (-)-epicatechin ((-)-EPI) to stimulate mitochondrial biogenesis (MiB) in mouse skeletal muscle (SkM). However, the mechanisms mediating the effects of (-)-EPI are not fully understood. We previously identified a role of the G-protein coupled estrogen receptor (GPER) in modulating the vascular effects of (-)-EPI. We therefore tested the hypothesis that GPER mediates (at least in part) the stimulatory effects of (-)-EPI on MiB in SkM cells. As an in vitro model, we employed mouse SkM-derived C2C12 myoblasts differentiated into myotubes...
January 16, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29355013/interaction-between-ester-type-tea-catechins-etc-and-neutrophil-gelatinase-associated-lipocalin-ngal-inhibitory-mechanism
#3
Wei Zhang, Xiao Li, Fang Hua, Wei Chen, Wei Wang, Gang-Xiu Chu, Guan-Hu Bao
Tea is thought to alleviate neurotoxicity due to the antioxidative effect of ester-type tea catechins (ETC). Neutrophil gelatinase-associated lipocalin (NGAL) can sensitize beta-amyloid (Aβ) induced neurotoxicity and inhibitors of NGAL may relieve associated symptoms. As such, the interactions of ETC with NGAL were investigated by fluorescence spectrometry and molecular simulation. NGAL fluorescence is quenched regularly when being added with six processing types of tea infusion (SPTT) and ETC. Thermodynamic analyses suggest that ETC with more catechol moieties has a stronger binding capacity with NGAL especially in the presence of Fe3+...
January 22, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29352475/characteristics-of-proanthocyanidins-in-leaves-of-chamaecyparis-obtusa-var-formosana-as-strong-%C3%AE-glucosidase-inhibitors
#4
Chia-Yun Hsu, Gong-Min Lin, Huan-You Lin, Shang-Tzen Chang
BACKGROUND: In recent decades there has been a growing demand for natural products with a view to using them as α-glucosidase inhibitors for reducing postprandial hyperglycemia. The hot water extract from Chamaecyparis obtusa var. formosana (Hayata) Rehder (Cupressaceae) (HWE) leaves and its soluble fractions were screened for α-glucosidase inhibition properties. The n-butanol soluble fraction of HWE was further fractionated into fourteen subfractions (B1-B14) using a Sephadex LH-20 column...
January 20, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29351247/b-type-and-complex-a-b-type-epicatechin-trimers-isolated-from-litchi-pericarp-aqueous-extract-show-high-antioxidant-and-anticancer-activity
#5
Yihui Gong, Fang Fang, Xin Zhang, Bin Liu, Honghui Luo, Zhen Li, Xuelian Zhang, Zhaoqi Zhang, Xuequn Pang
Litchi (Litchi chinensis Sonn.) fruit is known for its rich source of phenolics. Litchi pericarp contains high levels of epicatechin that may form oligomers of various lengths. Except for several A or B type epicatechin dimers, other soluble oligomers have rarely been identified in the pericarp. Here, bioassay-guided column fractionation was applied to isolate bioactive phenolics from aqueous pericarp extract. A fraction (S3) was obtained by two rounds of Sephadex LH-20 column chromatography, and showed higher antioxidant activity and inhibition on the proliferation of human lung cancer cells (A549) than Litchi anthocyanins...
January 19, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29349784/magnetic-molecularly-imprinted-polymers-based-on-silica-modified-by-deep-eutectic-solvents-for-the-rapid-simultaneous-magnetic-based-solid-phase-extraction-of-salvia-miltiorrhiza-bunge-glycine-max-linn-merr-and-green-tea
#6
Xiaoqin Wang, Guizhen Li, Kyung Ho Row
Novel magnetic molecularly imprinted polymers (MMIPs) with multiple-template based on silica were modified by four types of deep eutectic solvents (DESs) for the rapid simultaneous magnetic solid-phase extraction (MSPE) of tanshinone Ⅰ, tanshinone ⅡA, and cryptotanshinone from salvia miltiorrhiza bunge; glycitein, genistein, and daidzein from glycine max (Linn.) merr; and epicatechin, epigallocatechin gallate, and epicatechin gallate from green tea, respectively. The synthesized materials were characterized by Fourier transform infrared spectroscopy and field emission scanning electron microscopy...
January 19, 2018: Electrophoresis
https://www.readbyqxmd.com/read/29346317/liposomal-tricurin-a-synergistic-combination-of-curcumin-epicatechin-gallate-and-resveratrol-repolarizes-tumor-associated-microglia-macrophages-and-eliminates-glioblastoma-gbm-and-gbm-stem-cells
#7
Sumit Mukherjee, Juliet N E Baidoo, Samay Sampat, Andrew Mancuso, Lovena David, Leah S Cohen, Shuiqin Zhou, Probal Banerjee
Glioblastoma (GBM) is a deadly brain tumor with a current mean survival of 12-15 months. Despite being a potent anti-cancer agent, the turmeric ingredient curcumin (C) has limited anti-tumor efficacy in vivo due to its low bioavailability. We have reported earlier a strategy involving the use two other polyphenols, epicatechin gallate (E) from green tea and resveratrol (R) from red grapes at a unique, synergistic molar ratio with C (C:E:R: 4:1:12.5, termed TriCurin) to achieve superior potency against HPV+ tumors than C alone at C:E:R (μM): 32:8:100 (termed 32 μM+ TriCurin)...
January 18, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29345909/a-metabolomics-study-reveals-enhanced-inhibition-and-metabolic-dysregulation-in-e-coli-induced-by-lactobacillus-acidophilus-fermented-black-tea-extract
#8
Kundi Yang, Mattew Duley, Jiangjiang Zhu
This study examined the ability of Lactobacillus acidophilus (LA) to ferment black tea extract (BTE), and the enhancement of Escherichia coli cellular uptake of phenolic compounds when this bacteria was incubated with fermented BTE. The inhibitory effects of BTE to E. coli bacteria, with and w/o fermentation, were compared. Several intracellular phenolic compounds, as well as metabolic profiles of E. coli with and w/o treatments, were also determined using a HPLC-MS/MS-based approach. Our results showed that out of three concentrations from the non-fermented BTE treatment, only the extract from the 25 mg/ml tea leaves solution could inhibit E...
January 18, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29342884/effect-of-the-extraction-process-on-the-biological-activity-of-lyophilized-apricot-extracts-recovered-from-apricot-pomace
#9
Dina Cheaib, Nada El Darra, Hiba N Rajha, Iman El-Ghazzawi, Richard G Maroun, Nicolas Louka
The preservation of polyphenols in fruits by lyophilization has gained great interest in the recent decades. The present study aims to assess the impact of the pre-treatment extraction methods heat-assisted extraction (HAE) and infrared (IR) on lyophilized apricot pomace extracts. Then to test the conservation of polyphenols quantities as well as their bioactivities (antiradical and antibacterial) in lyophilized extract. An aqueous extract was obtained through either heat-assisted extraction or infrared pre-treatments then lyophilized to obtain a dried form...
January 14, 2018: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/29339827/the-impact-of-so2-on-wine-flavanols-and-indoles-in-relation-to-wine-style-and-age
#10
Panagiotis Arapitsas, Graziano Guella, Fulvio Mattivi
Wine has one of the broadest chemical profiles, and the common oenological practice of adding the antioxidant and antimicrobial sulfur dioxide has a major impact on its metabolomic fingerprint. In this study, we investigated novel discovered oenological reactions primarily occurring between wine metabolites and sulfur dioxide. The sulfonated derivatives of epicatechin, procyanidin B2, indole acetic acid, indole lactic acid and tryptophol were synthesized and for the first time quantified in wine. Analysis of 32 metabolites in 195 commercial wines (1986-2016 vintages) suggested that sulfonation of tryptophan metabolites characterised white wines, in contrast to red wines, where sulfonation of flavanols was preferred...
January 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29336809/screening-of-break-point-cluster-region-abelson-tyrosine-kinase-inhibitors-by-capillary-electrophoresis
#11
Mei Xu, Mengmeng Zheng, Guizhen Liu, Meng Zhang, Jingwu Kang
In the present study, a capillary electrophoresis (CE) method was developed for screening of inhibitors against the break point cluster region Abelson tyrosine kinase (BCR-ABL). The screening method was established by using 5-carboxyfluorescein labeled peptide substrate of BCR-ABL (F-ABLS), a known BCR-ABL tyrosine kinase inhibitor dasatinib, as well as a small chemical library consisting of 37 natural products. Thus, the inhibition of BCL-ABL kinase by small inhibitors was assayed by a CE system equipped with the laser induced fluorescence detector...
January 8, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29333387/physicochemical-and-antioxidant-properties-of-honeys-from-the-sundarbans-mangrove-forest-of-bangladesh
#12
M Rabiul Islam, Tahmina Pervin, Hemayet Hossain, Badhan Saha, Sheikh Julfikar Hossain
This study evaluated the physicochemical, nutritional, antioxidant, and phenolic properties of ten honey samples from the Sundarbans mangrove forest, Bangladesh. The average pH, electrical conductivity, total dissolved solid, ash, moisture, hydroxymethyl furfural, titrable acidity, and absorbance were 4.3, 0.38 mS/cm, 187.5 ppm, 0.14%, 17.88%, 4.4 mg/kg, 37.7 meq/kg, and 483 mAU, respectively. In the honeys, the average contents of Ca, Cu, Fe, K, Mg, Mn, and Na were 95.5, 0.19, 6.4, 302, 39.9, 3.4, and 597 ppm, respectively, whereas Cd, Cr, Pb, and Ni were not found...
December 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/29331860/c18-core-shell-column-with-in-series-absorbance-and-fluorescence-detection-for-simultaneous-monitoring-of-changes-in-stilbenoid-and-proanthocyanidin-concentrations-during-grape-cane-storage
#13
Vania Sáez, Camila Gayoso, Sebastián Riquelme, Julie Pérez, Carola Vergara, Claudia Mardones, Dietrich von Baer
Grape canes, the residues from the annual pruning of vines, contain high levels of inducible (E)-resveratrol and also oligomeric stilbenoids and proanthocyanidins. These two families of phenolic compounds are bioactive, but to quantify them in a single chromatographic run using only ultraviolet detection is a difficult task. To overcome this limitation, a chromatographic method was developed using a core shell column for separation, an ultraviolet-visible diode array detector (DAD) and a fluorescence (FL) detector connected in series for quantification, with an electrospray ionization interface (ESI) and a triple quadrupole mass spectrometric detector (MS/MS) added for identification of the analytes...
December 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29329871/isolation-of-proanthocyanidins-from-red-wine-and-their-inhibitory-effects-on-melanin-synthesis-in-vitro
#14
Takahiro Fujimaki, Shoko Mori, Manabu Horikawa, Yuko Fukui
The red wines made from Vitis vinifera were identified as skin-whitening effectors by using in vitro assays. OPCs in the wine were evaluated for tyrosinase activity and melanogenesis. Strong tyrosinase inhibitory activity was observed in fractions with high oligomeric proanthocyanidin (OPC) content. Among OPC dimers, a strong inhibitory effect on tyrosinase was observed with OPCs which contain (+)-catechin as an upper unit. Melanogenesis inhibitory effect was observed with OPCs which have (-)-epicatechin as upper units...
May 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29329862/active-compounds-antioxidant-activity-and-%C3%AE-glucosidase-inhibitory-activity-of-different-varieties-of-chaenomeles-fruits
#15
Jing Miao, Xia Li, Chengcheng Zhao, Xiaoxiao Gao, Ying Wang, Wenyuan Gao
Chaenomeles is an important source for food industry in China, and its planting area is expanding year by year. This study was conducted to evaluate different varieties of Chaenomeles by comparing the chemical compositions, antioxidant activity and α-glucosidase inhibitory activity of peels and fleshes from twelve varieties of Chaenomeles. In the results, peels of Chaenomeles contain more phenolics, flavonoids and triterpenes, and show better antioxidant activity and α-glucosidase inhibitory activity than their fleshes...
May 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29322133/anti-fibrotic-activity-of-polyphenol-enriched-sugarcane-extract-in-rats-via-inhibition-of-p38-and-jnk-phosphorylation
#16
Liwen Wang, Min-Hsiung Pan, Chih-Yu Lo, Hui Zhao, Shiming Li, Chi-Tang Ho, Guliang Yang
Sugarcane (Saccharum officinarum L.), which is one of the most important sources of sugar, is also rich in polyphenolic compounds. In this study, polyphenols from sugarcane were extracted, and the dominant component was characterized quantitatively via HPLC to be (-)-epicatechin. Fibrosis occurs in many organs and is associated with severe tissue damage. Liver fibrosis is the excessive accumulation of extracellular matrix proteins and advanced liver fibrosis, resulting in cirrhosis, liver failure and portal hypertension...
January 11, 2018: Food & Function
https://www.readbyqxmd.com/read/29315228/contribution-of-secondary-metabolites-to-the-gastroprotective-effect-of-aqueous-extract-of-ximenia-americana-l-olacaceae-stem-bark-in-rats
#17
Ticiana Parente Aragão, Lady Dayane Kalline Travassos Dos Prazeres, Samara Alves Brito, Pedro José Rolim Neto, Larissa Araújo Rolim, Jackson Roberto Guedes da Silva Almeida, Germana Freire Rocha Caldas, Almir Gonçalves Wanderley
Ximenia americana L. (Olacaceae) is used in ethnomedicine as cicatrizant and for the treatment of gastric disorders. This study identified the chemical constituents of the aqueous extract of X. americana (XaAE) and evaluated its antiulcerogenic activity. After lyophilization, XaAE was analyzed by liquid chromatography-mass spectrometry (LC-MS) and its antiulcerogenic effect was evaluated in acute gastric lesions induced by ethanol, acidified ethanol, and indomethacin. Antisecretory action, mucus production and the participation of sulfhydryl groups (-SH) and nitric oxide (NO) were also investigated...
January 9, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29307236/garcixanthone-a-a-new-cytotoxic-xanthone-from-the-pericarps-of-garcinia-mangostana
#18
Sabrin Ragab Mohamed Ibrahim, Gamal Abdallah Mohamed, Mahmoud Abdelkhalek Elfaky, Rwaida Adel Al Haidari, Mohamed Fathalla Zayed, Amal Abd-Elmoneim El-Kholy, Amgad Ibrahim Mansour Khedr
A new prenylated xanthone, garcixanthone A (5), together with eight known compounds, mangostanaxanthones I (1) and II (2), garcinone E (3), β-mangostin (4), 8-hydroxycudraxanthone G (6), garcinone C (7), cudraxanthone G (8), and (-)-epicatechin (9) were isolated from the EtOAc-soluble fraction of the air-dried pericarps of Garcinia mangostana (family Clusiaceae). Their structures were verified on the basis of spectroscopic data interpretation as well as comparison with the literature. The cytotoxic and antimicrobial activities of the new compound were assessed using sulforhodamine B (SRB) and agar disk diffusion assays, respectively...
January 7, 2018: Journal of Asian Natural Products Research
https://www.readbyqxmd.com/read/29287435/determination-of-free-esterified-glycosylated-and-insoluble-bound-phenolics-composition-in-the-edible-part-of-araticum-fruit-annona-crassiflora-mart-and-its-by-products-by-hplc-esi-ms-ms
#19
Henrique Silvano Arruda, Gustavo Araujo Pereira, Damila Rodrigues de Morais, Marcos Nogueira Eberlin, Glaucia Maria Pastore
Phenolics present in the free, esterified, glycosylated and insoluble-bound forms of araticum pulp, peel and seed were for the first time characterized and quantified using HPLC-ESI-MS/MS. Levels of total phenolics, flavonoids, condensed tannins and antioxidant activities from araticum fruit followed the order peel > pulp > seed. Overall, insoluble-bound and esterified phenolics were the dominant forms of phenolics from araticum fruit parts and the highest contributors to their antioxidant activities...
April 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29277232/isolation-of-strawberry-anthocyanins-using-high-speed-counter-current-chromatography-and-the-copigmentation-with-catechin-or-epicatechin-by-high-pressure-processing
#20
Hui Zou, Yan Ma, Zhenzhen Xu, Xiaojun Liao, Ailiang Chen, Shuming Yang
Three anthocyanins were isolated from strawberry extract by high-speed counter-current chromatography, using a biphasic mixture of tert-butyl methyl ether, n-butanol, acetonitrile, water and trifluoroacetic acid (2.5:2.0:2.5:5.0:1.0%). The anthocyanins were identified as pelargonidin-3-rutinoside, cyanidin-3-glucoside and pelargonidin-3-glucoside with purity of 95.6%, 96.2% and 99.3% respectively. Additionally, the copigmentation reaction rates between pelargonidin-3-glucoside and phenolic acids (catechin or epicatechin) at pH 1...
May 1, 2018: Food Chemistry
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