keyword
MENU ▼
Read by QxMD icon Read
search

Procyanidin

keyword
https://www.readbyqxmd.com/read/28813594/facile-purification-of-milligram-to-gram-quantities-of-condensed-tannins-according-to-mean-degree-of-polymerization-and-flavan-3-ol-subunit-composition
#1
Ron Herbert Brown, Irene Mueller-Harvey, Wayne E Zeller, Laurie Reinhardt, Elisabetta Stringano, An Gea, Chris Drake, Honorata M Ropiak, Christos Fryganas, Aina Ramsay, Emily E Hardcastle
Unambiguous investigation of condensed tannin (CT) structure-activity relationships in biological systems requires well-characterized, high-purity CTs. Sephadex LH-20 and Toyopearl HW-50F resins were compared for separating CTs from acetone/water extracts and column fractions analyzed for flavan-3-ol subunits, mean degree of polymerization (mDP) and purity. Toyopearl HW-50F generated fractions with higher mDP values and better separation of procyanidins (PC) and prodelphinidins (PD) but required a pre-purification step, more time for large scale purifications and gave poorer recoveries...
August 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28798415/epicatechin-oligomers-longer-than-trimers-have-anti-cancer-activities-but-not-the-catechin-counterparts
#2
Kohki Takanashi, Manato Suda, Kiriko Matsumoto, Chisato Ishihara, Kazuya Toda, Koichiro Kawaguchi, Shogo Senga, Narumi Kobayashi, Mikihiro Ichikawa, Miyuki Katoh, Yasunao Hattori, Sei-Ichi Kawahara, Koji Umezawa, Hiroshi Fujii, Hidefumi Makabe
Since procyanidins (oligomeric catechin or epicatechin) were reported to exhibit health benefits, much attention has been paid to the synthesis of these compounds, especially those that are longer than trimers. In the present study, syntheses of cinnamtannin A3 (epicatechin pentamer), A4 (epicatechin hexamer), catechin tetramer, pentamer, arecatannin A2 (epicatechin-epicatechin-epicatechin-catechin) and A3 (epicatechin-epicatechin-epicatechin-epicatechin-catechin) were achieved. The key reaction was a Lewis acid mediated equimolar condensation...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28783092/interaction-between-various-apple-procyanidin-and-staphylococcal-enterotoxin-a-and-their-inhibitory-effects-on-toxin-activity
#3
Yuko Shimamura, Chikako Hirai, Yuka Sugiyama, Mio Utsumi, Akio Yanagida, Masatsune Murata, Norio Ohashi, Shuichi Masuda
In this study, we investigated the interaction between apple polyphenols (AP; mainly consisting of procyanidin (PC) from an apple) and staphylococcal enterotoxin A (SEA), and the inhibitory effects of AP on SEA activity. According to the degree of polymerization, in particularly highly polymerized PC (more than pentamer) strongly interacted with SEA. The binding affinity of AP with SEA molecules was determined using Biacore analysis. AP reacted with SEA immobilized on a Biacore sensor chip. After treatment with pepsin and pancreatin, to examine the changes of binding affinity of AP in intragastric conditions, AP maintained interaction with SEA...
August 7, 2017: Toxins
https://www.readbyqxmd.com/read/28780322/reduction-of-oxidative-damages-induced-by-titanium-dioxide-nanoparticles-correlates-with-induction-of-the-nrf2-pathway-by-gspe-supplementation-in-mice
#4
Linpeng Niu, Mengjiao Shao, Yuan Liu, Jinfeng Hu, Ruofan Li, Heran Xie, Lixiao Zhou, Lei Shi, Rong Zhang, Yujie Niu
Titanium dioxide nanoparticles (TiO2 NPs) are widely used to additives in cosmetics, pharmaceuticals, paints and foods. Recent studies have demonstrated that TiO2 NPs increased the risk of cancer and the mechanism might relate with oxidative stress. Grape seed procyanidin extract (GSPE) is a natural compound which has been demonstrated to possess a wide array of pharmacological and biochemical actions, including anti-inflammatory, anti-carcinogenic, and antioxidant properties. Our data show that GSPE prevents the changes of histopathology and biomarkers in heart, liver and kidney that occur in mice exposed to TiO2 NPs...
August 2, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28775234/oligomer-procyanidins-f2-repress-hif-1%C3%AE-expression-in-human-u87-glioma-cells-by-inhibiting-the-egfr-akt-mtor-and-mapk-erk1-2-signaling-pathways-in-vitro-and-in-vivo
#5
Hong-Li Zheng, Li-Hui Wang, Bao-Shan Sun, Yi Li, Jing-Yu Yang, Chun-Fu Wu
Hypoxia-inducible factor-1 (HIF-1) is over-expressed in gliomas and has become one of the most compelling tumor targets. In this study, we found that oligomer procyanidins (F2) can suppress the expressions of HIF-1α and its target genes in U87 cells, and also down-regulate the EGFR/PI3K/AKT/mTOR and MAPK/ERK1/2 pathways in vitro and in vivo. Furthermore, hypoxia-induced formation of tubular structures by human umbilical vascular endothelial cells and the migration and invasion of U87 cells could be inhibited by F2 in a HIF-1 dependent manner...
July 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28764032/phenolic-acids-and-flavonoids-of-peanut-by-products-antioxidant-capacity-and-antimicrobial-effects
#6
Adriano Costa de Camargo, Marisa Aparecida Bismara Regitano-d'Arce, Gabriela Boscariol Rasera, Solange Guidolin Canniatti-Brazaca, Leonardo do Prado-Silva, Verônica Ortiz Alvarenga, Anderson S Sant'Ana, Fereidoon Shahidi
Peanut skin (PS) and meal from dry-blanched peanuts (MDBP) were evaluated as sources of phenolic compounds. PS rendered the highest total phenolic content, antioxidant capacity towards ABTS radical cation, DPPH and hydroxyl radicals as well as reducing power. Phenolic acids were present in PS and MDBP whereas proanthocyanidins and monomeric flavonoids were found only in PS as identified by HPLC-DAD-ESI-MS(n). Procyanidin-rich extracts prevented oxidation in non-irradiated and gamma-irradiated fish model system...
December 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28763995/extraction-identification-and-assessment-of-antioxidative-compounds-of-bran-extracts-of-traditional-rice-cultivars-an-analytical-approach
#7
Farhan M Bhat, Charanjit S Riar
The antioxidative compounds were extracted by ultrasonic treatment of bran extracts of seven pigmented (completely) and non pigmented (sparsely) colored rice cultivars followed by assessment of their in vitro antioxidative capacity by LC-MS and oxidation/reduction assay based methods. A total of 40-compounds, 7-phenolic, 9-flavonoids, 9-hydroxycinammic acid derivatives, 3-hydroxybenzoic acid derivatives and other glucosides specifically, pro-anthocyanidin trimer and procyanidin-B1 (dimer) were indentified in completely colored rice cultivars...
December 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28756814/grape-seed-procyanidin-extract-reduces-arsenic-induced-renal-inflammatory-injury-in-male-mice
#8
Cheng Wang, Jun Li, Guan Ling Song, Qiang Niu, Shang Zhi Xu, Gang Ling Feng, Hai Xia Wang, Yu Li, Shu Gang Li, Feng Li
The aim of the present study is to evaluate the ability and mechanism by which grape seed procyanidin extract (GSPE) relieves arsenic trioxide (As2O3)-induced renal inflammatory injury. Therefore, male Kunming mice were treated with As2O3 and/or GSPE by gavage for 5 weeks. Mice were then sacrificed and inflammatory cytokines of kidneys were examined by ELISA, whereas the expression levels of molecules involved in the nuclear factor (NF)-κB signaling pathway were evaluated by both qRT-PCR and Western blot. Our results indicate that GSPE prevents As2O3-mediated renal inflammatory injury by inhibiting activation of the NF-κB signaling pathway and inflammatory cytokine production, while promoting expression of anti-inflammatory cytokines...
July 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/28755356/extraction-and-estimation-of-secondary-metabolites-from-date-palm-cell-suspension-cultures
#9
Poornananda M Naik, Jameel M Al-Khayri
The health benefits of dates arise from their content of phytochemicals, known for having pharmacological properties, including flavonoids, carotenoids, phenolic acids, sterols, procyanidins, and anthocyanins. In vitro cell culture technology has become an attractive means for the production of biomass and bioactive compounds. This chapter describes step-by-step procedures for the induction and proliferation of callus from date palm offshoots on Murashige and Skoog (MS) medium supplemented with plant growth regulators...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28744920/anti-myocardial-ischemia-effect-and-components-of-litchi-pericarp-extracts
#10
Yanfen Chen, Huanqing Li, Shu Zhang, Chaoyan Yang, Ziying Mai, Xueyan Hu, Zhenhu Gao, Hong Deng
Litchi (Litchi chinensis Sonn.) is a famous fruit in south China, and it is also effective for chest tightness or chest pain, irritability, flatulence, epigastric pain and neuralgic pain, hernia pain and testicular swelling, cough, etc. It is valued because a great amount of polyphenol was found in litchi pericarp. In this paper, we got litchi pericarp pure extract by a simple purification method, then evaluated its activity to clear oxygen free radicals in vitro, and evaluated its myocardial protection effect in vivo through acute myocardial ischemia rat model...
July 26, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/28743229/astilbe-thunbergii-reduces-postprandial-hyperglycemia-in-a-type-2-diabetes-rat-model-via-pancreatic-alpha-amylase-inhibition-by-highly-condensed-procyanidins
#11
Eisuke Kato, Natsuka Kushibiki, Yosuke Inagaki, Mihoko Kurokawa, Jun Kawabata
Type 2 diabetes mellitus (T2DM) is a common global health problem. Prevention of this disease is an important task, and functional food supplements are considered an effective method. We found potent pancreatic α-amylase inhibition in Astilbe thunbergii root extract (AT) and confirmed that AT treatment in a T2DM rat model reduces post-starch administration blood glucose levels. Activity-guided isolation revealed procyanidin (AT-P) as the α-amylase inhibitory component with IC50 = 1.7 μg/mL against porcine pancreatic α-amylase...
September 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28730980/validation-of-spectrophotometric-methods-for-the-determination-of-total-polyphenol-and-total-flavonoid-content
#12
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/28702654/direct-and-indirect-measurements-of-enhanced-phenolic-bioavailability-from-litchi-pericarp-procyanidins-by-lactobacillus-casei-01
#13
Shuyi Li, Xiaopeng Li, Avi Shpigelman, Jose M Lorenzo, Domenico Montesano, Francisco J Barba
Litchi pericarp procyanidins (LPP) are dietary supplements with high antioxidant activity, but poor oral bioavailability and efficacy. Lactobacillus casei (L. casei-01) can transform flavan-3-ols from litchi pericarp and increase their antioxidant ability; thus, L. casei-01 with LPP was administered to rats for four and eight weeks to study the effect of such a combination on metabolic parameters and on phase II metabolism and detoxification pathways in the liver as an indirect measure for phenolic bioavailability...
August 1, 2017: Food & Function
https://www.readbyqxmd.com/read/28698985/a-cinnamon-derived-procyanidin-type-a-compound-inhibits-hepatitis-c-virus-cell-entry
#14
Catherine Fauvelle, Melanie Lambotin, Laura Heydmann, Ekambaranellore Prakash, Sunil Bhaskaran, Mohan Vishwaraman, Thomas F Baumert, Christiane Moog
BACKGROUND AND AIMS: Chronic hepatitis C virus (HCV) infection is a major cause of liver disease worldwide. Although direct-acting antivirals can cure the large majority of treated patients, important limitations remain, including treatment failure and high costs precluding access to therapy in resource-limited settings. We report herein the anti-HCV effects of IND02, a procyanidin type A molecule, isolated and characterized from cinnamon. METHODS AND RESULTS: Using cellculture-derived HCV (HCVcc), HCV pseudoparticles (HCVpp), and subgenomic replicons, we demonstrated that IND02 markedly and dose-dependently inhibited HCV cell entry...
July 11, 2017: Hepatology International
https://www.readbyqxmd.com/read/28693689/neuroprotective-effects-of-grape-seed-procyanidin-extract-on-ischemia-reperfusion-brain-injury
#15
Xiangyi Kong, Jian Guan, Shun Gong, Renzhi Wang
Objective Oxidative stress (OS) plays a crucial role in ischemic stroke. Grape seed procyanidin extract (GSPE) was reported to be a critical regulator of OS. We hypothesized that GSPE might also be protective in ischemia-reperfusion brain injury. This study aimed to explore whether GSPE administration can protect mice from ischemia-reperfusion brain injury.Methods Transient middle cerebral artery occlusion (MCAO) was conducted followed by reperfusion for 24 hours to make ischemia-reperfusion brain injury in mice that received GSPE (MCAOG, n=60) or normal saline (MCAONS, n=60)...
June 10, 2017: Chinese Medical Sciences Journal, Chung-kuo i Hsüeh K'o Hsüeh Tsa Chih
https://www.readbyqxmd.com/read/28692264/phenolic-responses-to-esca-associated-fungi-in-differently-decayed-grapevine-woods-from-different-trunk-parts-of-cabernet-sauvignon
#16
COMPARATIVE STUDY
Denis Rusjan, Martina Persic, Matevž Likar, Katerina Biniari, Maja Mikulic-Petkovsek
Alterations in phenolic contents were studied in Esca symptomatic (Sym) and asymptomatic (Asym) vines of 'Cabernet Sauvignon' based on wood conditions (healthy, HLT; necrotic, Nec; and rotten, Rot) and vine parts (head, trunk, and rootstock). In Asym vines, only Alternaria alternate was identified in Nec wood, while the HLT wood of Sym vines was colonized by Botryospaeriaceae sp. and Aureobasidium pullulans, Nec wood by Fomitiporia mediterranea, and Rot wood by Fomitiporia mediterranea and Phaeomoniella chlamydospora...
August 9, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28678204/anti-inflammatory-and-anti-urolithiasis-effects-of-polyphenolic-compounds-from-quercus-gilva-blume
#17
Sung Hye Youn, Joo Hee Kwon, Jun Yin, Le Thi Tam, Hye Shin Ahn, Soon Chul Myung, Min Won Lee
Quercus gilva Bume (QGB, family Fagaceae) is a tall evergreen oak species tree that grows in warm temperate regions in Korea, Japan, China and Taiwan. Quercus plants have long been the basis of traditional medicines. Their clinical benefits according to traditional medicine include relief of urolithiasis, tremors and inflammation. In the present study, the anti-urolithiasis activity including anti-inflammatory and anti-oxidative activities, of some phenolic compounds isolated from QGB were described. Seven compounds were isolated and identified as picraquassioside D (1), quercussioside (2), (+)-lyoniresinol-9'α-O-β-d-xylopyranoside (3), (+)-catechin (4), (-)-epicatechin (5), procyanidin B-3 (6), and procyanidin B-4 (7)...
July 5, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28677803/grape-seed-procyanidin-b2-ameliorates-hepatic-lipid-metabolism-disorders-in-db-db-mice
#18
Mei Yin, Pei Zhang, Fei Yu, Zhen Zhang, Qian Cai, Weida Lu, Baoying Li, Weidong Qin, Mei Cheng, Hao Wang, Haiqing Gao
Diabetes is commonly associated with liver lipid metabolism disorders. AMP-activated protein kinase (AMPK) has a key role in regulating lipid metabolism. Grape seed procyanidin B2 (GSPB2), a natural polyphenol polymer, ameliorates mitochondrial dysfunction and inhibits oxidative stress or apoptosis via AMPK pathways. In the present study, the hypothesis that GSPB2 treatment may ameliorate liver lipid metabolic disorders by activating AMPK and downstream pathways was tested in diabetic mice. Db/m mice were used as controls, and diabetic db/db mice were randomly divided into 2 groups for treatment: Vehicle and GSPB2 (30 mg/kg/day for 10 weeks)...
September 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28677264/influence-of-procyanidin-supplementation-on-the-immune-responses-of-broilers-challenged-with-lipopolysaccharide
#19
Qiu Jue Wu, Yu Qin Wang, Yan Xia Qi
In the present study, the effect of dietary procyanidin (PCA, from pine needles) supplementation on the innate immunity of broilers were investigated. The experiment was designed as a 2 × 4 factorial arrangement (eight cages / treatment; six birds (one-day-old) / cage) with dietary PCA concentrations (0, 0.05, 0.075 and 0.1%) and two immune treatments (injection of lipopolysaccharide (LPS) (0.5 mg/kg body weight) or saline). LPS was dissolved in sterile 9 g/L (w/v) NaCl solution at 16, 18, 20 days of age to mimic immune stress...
July 2017: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/28672844/5-3-4-dihydroxyphenyl-%C3%AE-valerolactone-a-major-microbial-metabolite-of-proanthocyanidin-attenuates-thp-1-monocyte-endothelial-adhesion
#20
Charles C Lee, Jong Hun Kim, Ji Seung Kim, Yun Sil Oh, Seung Min Han, Jung Han Yoon Park, Ki Won Lee, Chang Yong Lee
Several metabolomics of polymeric flavan-3-ols have reported that proanthocyanidins are extensively metabolized by gut microbiota. 5-(3',4'-dihydroxyphenyl)-γ-valerolactone (DHPV) has been reported to be the major microbial metabolite of proanthocyanidins. We demonstrated that DHPV has stronger prevention effect on tumor necrosis factor (TNF)-α-stimulated adhesion of THP-1 human monocytic cells to human umbilical vein endothelial cells compared to its potential precursors such as procyanidin A1, A2, B1 and B2, (+)catechin, (-)epicatechin and its microbial metabolites such as 3-(3,4-dihydroxyphenyl)propionic acid and 2-(3,4-dihydroxyphenyl)acetic acid...
June 26, 2017: International Journal of Molecular Sciences
keyword
keyword
63169
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"