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Flavanols

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https://www.readbyqxmd.com/read/28317766/first-evidences-of-interaction-between-pyranoanthocyanins-and-salivary-proline-rich-proteins
#1
Ignacio García-Estévez, Luís Cruz, Joana Oliveira, Nuno Mateus, Victor de Freitas, Susana Soares
The contribution of other classes of polyphenol compounds besides tannins to the overall perception of astringency is still poorly understood. So, this work aimed to study the interaction between a family of salivary proline-rich proteins (aPRPs) and representative pyranoanthocyanins in red wines [pyranomalvidin-3-glucoside (vitisin B), pyranomalvidin-3-glucoside-catechol, and pyranomalvidin-3-glucoside-epicatechin] using saturation transfer difference-NMR and MALDI-TOF. For vitisin B KD was of 1.74mM; for pyranomalvidin-3-glucoside-catechol was 1...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28317253/correlation-between-the-potency-of-flavonoids-for-cytochrome-c-reduction-and-inhibition-of-cardiolipin-induced-peroxidase-activity
#2
Ricardo Lagoa, Alejandro K Samhan-Arias, Carlos Gutierrez-Merino
There are large differences between flavonoids to protect against apoptosis, a process in which cytochrome c (Cyt c) plays a key role. In this work, we show that 7 of 13 flavonoids studied have a capacity to reduce Cyt c similar or higher than ascorbate, the flavonols quercetin, kaempferol and myricetin, flavanol epigallocatechin-gallate, anthocyanidins cyanidin and malvidin, and the flavone luteolin. In contrast, the kaempferol 3(O)- and 3,4'(O)-methylated forms, the flavanone naringenin, and also apigenin and chrysin, had a negligible reducing capacity...
March 20, 2017: BioFactors
https://www.readbyqxmd.com/read/28301949/phenolic-constituents-from-rheum-nobile-and-their-antioxidant-activity
#3
Ye Fei, Juan Wang, Bing Peng, Jiangnan Peng, Jing-Hong Hu, Zu-Ping Zeng, Jing Chen, Qi-En Li, Zeng-Ping Gao, Xing-Li Yan
Although the rhizomes of Rheum nobile Hook. f. et Thoms (Polygonaceae) are widely used in Tibetan medicine, no previous investigations regarding the biological activities and rarely chemical constituents of this plant have been reported. As part of an ongoing search for novel bioactive agents, a phytochemical investigation of R. nobile led to the isolation of two new compounds Rheumone B (1) and piceatannol-4'-O-β-D-(6″-O-acetyl)-glucoside (2), together with 15 known compounds by gel filtration over Sephadex LH-20 and preparative HPLC...
March 17, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28298268/effects-of-dietary-flavonoids-on-reverse-cholesterol-transport-hdl-metabolism-and-hdl-function
#4
REVIEW
Courtney L Millar, Quinn Duclos, Christopher N Blesso
Strong experimental evidence confirms that HDL directly alleviates atherosclerosis. HDL particles display diverse atheroprotective functions in reverse cholesterol transport (RCT), antioxidant, anti-inflammatory, and antiapoptotic processes. In certain inflammatory disease states, however, HDL particles may become dysfunctional and proatherogenic. Flavonoids show the potential to improve HDL function through their well-documented effects on cellular antioxidant status and inflammation. The aim of this review is to summarize the basic science and clinical research examining the effects of dietary flavonoids on RCT and HDL function...
March 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/28285129/green-tea-flavanols-protect-human-%C3%AE-b-crystallin-from-oxidative-photodamage
#5
Susmitnarayan Chaudhury, Pritam Roy, Swagata Dasgupta
Age related cataract is a major cause of visual loss worldwide that is a result of opacification of the eye lens proteins. One of the major reasons behind this deterioration is UV induced oxidative damage. The study reported here is focused on an investigation of the oxidative stress induced damage to γB-crystallin under UV exposure. Human γB-crystallin has been expressed and purified from E. coli. We have found that epicatechin gallate (ECG) has a higher affinity towards the protein compared to epigallocatechin (EGC)...
March 8, 2017: Biochimie
https://www.readbyqxmd.com/read/28282562/synthesis-characterization-and-biological-evaluation-of-ruthenium-flavanol-complexes-against-breast-cancer
#6
Ashok Kumar Singh, Gunjan Saxena, Sahabjada, M Arshad
Four Ru(II) DMSO complexes (M1R-M4R) having substituted flavones viz. 3-Hydroxy-2-(4-methoxyphenyl)-4H-chromen-4-one (HL1), 3-Hydroxy-2-(4-nitrophenyl)-4H-chromen-4-one (HL2), 3-Hydroxy-2-(4-dimethylaminophenyl)-4H-chromen-4-one (HL3) and 3-Hydroxy-2-(4-chlorophenyl)-4H-chromen-4-one (HL4) were synthesized and characterized by elemental analysis, IR, UV-Vis, (1)H NMR spectroscopies and ESI-MS. The molecular structures of the complexes were investigated by integrated spectroscopic and computational techniques (DFT)...
March 1, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28276907/dietary-sources-of-polyphenols-in-the-mediterranean-healthy-eating-aging-and-lifestyle-meal-study-cohort
#7
Justyna Godos, Stefano Marventano, Antonio Mistretta, Fabio Galvano, Giuseppe Grosso
The aim of this study was to estimate the dietary intake and major food sources of polyphenols in the Mediterranean healthy Eating, Aging and Lifestyles (MEAL) study cohort. A total of 1937 individuals (18 + y) of urban population of Catania, Italy, completed a validated 110-item food frequency questionnaire; Phenol-Explorer database was used to estimate polyphenol intake. Mean intake of polyphenols was 663.7 mg/d; the most abundant classes were phenolic acids (362.7 mg/d) and flavonoids (258.7 mg/d)...
February 9, 2017: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/28226182/effect-of-different-solvents-on-the-measurement-of-phenolics-and-the-antioxidant-activity-of-mulberry-morus-atropurpurea-roxb-with-accelerated-solvent-extraction
#8
Jiufang Yang, XiaoQun Ou, Xiaoxu Zhang, ZiYing Zhou, LiYan Ma
The effects of 9 different solvents on the measurement of the total phenolics and antioxidant activities of mulberry fruits were studied using accelerated solvent extraction (ASE). Sixteen to 22 types of phenolics (flavonols, flavan-3-ols, flavanol, hydroxycinnamic acids, hydroxybenzoic acids, and stilbenes) from different mulberry extracts were characterized and quantified using HPLC-MS/MS. The principal component analysis (PCA) was used to determine the suitable solvents to distinguish between different classes of phenolics...
February 22, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28221885/antibacterial-and-antiadhesive-activities-of-extracts-from-edible-plants-against-soft-drink-spoilage-by-asaia-spp
#9
Hubert Antolak, Agata Czyzowska, Dorota Kregiel
This study was conducted to investigate the antibacterial and antiadhesive activities of ethanol extracts from five edible plant parts: cinnamon bark ( Cinnamomum zeylanicum ), licorice root ( Glycyrrhiza radix ), nettle leaves ( Urtica dioica ), green tea leaves ( Camellia sinensis ), and elderberry flowers ( Sambucus nigra ). The chemical constituents of the extracts were identified using high-performance liquid chromatography and liquid chromatography plus mass spectrometry. Six strains of Asaia lannensis and Asaia bogorensis bacteria isolated from spoiled commercial fruit-flavored noncarbonated mineral water were used...
January 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28202499/dietary-phytochemical-intake-from-foods-and-health-outcomes-a-systematic-review-protocol-and-preliminary-scoping
#10
Yasmine C Probst, Vivienne X Guan, Katherine Kent
INTRODUCTION: Dietary phytochemicals are found in plant-based foods such as fruits, vegetables and grains and may be categorised in a nested hierarchical manner with many hundred individual phytochemicals identified to date. To associate phytochemical intakes with positive health outcomes, a fundamental step is to accurately estimate the dietary phytochemical intake from foods reported. The purpose of this systematic review protocol is to describe the process to be undertaken to summarise the evidence for food-based dietary phytochemical intakes and health outcomes for adults...
February 15, 2017: BMJ Open
https://www.readbyqxmd.com/read/28188641/the-influence-of-plant-protection-by-effective-microorganisms-on-the-content-of-bioactive-phytochemicals-in-apples
#11
Barbara Kusznierewicz, Anna Lewandowska, Dorota Martysiak-Żurowska, Agnieszka Bartoszek
BACKGROUND: The phytochemicals of two apple cultivars (Yellow Transparent and Early Geneva) protected in two ways: conventionally with chemical pesticides or by effective organisms (EM), were compared. Two types of components were determined: lipids synthesized constitutively and generated via inducible pathways polyphenols along with antioxidant activity and profiles. RESULTS: The antioxidant activities assessed with ABTS, DPPH and Folin-Ciocalteu reagents were about twice higher in the case of microbiologically protected apples...
February 11, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28182841/bioactive-components-and-antioxidant-capacity-of-fruits-from-nine-sorbus-genotypes
#12
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/28167273/mybs-affect-the-variation-in-the-ratio-of-anthocyanin-and-flavanol-in-fruit-peel-and-flesh-in-response-to-shade
#13
Yanfen Lu, Yufen Bu, Suxiao Hao, Yaru Wang, Jie Zhang, Ji Tian, Yuncong Yao
Fruit pigment accumulation, which represents an important indicator of nutrient quality and appearance value, is often affected by low light under rain, cloud, fog and haze conditions during the veraison period. It is not known whether continuous low light interferes with the production and accumulation of secondary metabolites in veraison fruit. In this paper, we measured pigments and the transcriptional level of genes related to secondary metabolites, i.e., flavonoid biosynthesis in the peel and flesh of Malus crabapple 'Radiant' fruit in response to normal light and shade from 10th July to 30th August...
January 31, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28159263/pre-fermentative-cold-maceration-saign%C3%A3-e-and-various-thermal-treatments-as-options-for-modulating-volatile-aroma-and-phenol-profiles-of-red-wine
#14
Igor Lukić, Irena Budić-Leto, Marijan Bubola, Kristijan Damijanić, Mario Staver
The effects of six maceration treatments on volatile aroma and phenol composition of Teran red wine were studied: standard maceration (control C), cold pre-fermentation maceration (CPM), saignée (S), pre-fermentation heating with extended maceration (PHT) or juice fermentation (PHP), and post-fermentation heating (POH). PHP wine contained the highest amounts of esters, fatty acids and anthocyanins, and the lowest content of other phenols. Alternative treatments decreased higher alcohols in relation to control C...
June 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28158946/flavanol-quantification-of-grapes-via-multiple-reaction-monitoring-mass-spectrometry-application-to-the-differentiation-among-clones-of-vitis-vinifera-l-cv-rufete-grapes
#15
Ignacio García-Estévez, Cristina Alcalde-Eon, M Teresa Escribano-Bailon
The determination of the detailed flavanol composition in food matrices is not a simple task because of the structural similarities of monomers and, consequently, oligomers and polymers. The aim of this study was the development and validation of an HPLC-MS/MS-multiple reaction monitoring (MRM) method that would allow the accurate and precise quantification of catechins, gallocatechins and oligomeric proanthocyanidins. The high correlation coefficients of the calibration curves (>0.993), the recoveries not statistically different from 100%, the good intra- and inter-day precision (lower than 5%) and the LOD and LOQ values, low enough to quantify flavanols in grapes, are good results from the method validation procedure...
February 3, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28153244/cyclic-voltammetry-to-evaluate-the-antioxidant-potential-in-winemaking-by-products
#16
M José Jara-Palacios, M Luisa Escudero-Gilete, J Miguel Hernández-Hierro, Francisco J Heredia, Dolores Hernanz
Grape pomace is composed of seeds, skins and stems that are an important source of phenolic substances, which have antioxidant properties and potential benefits to human health. Cyclic voltammetry (CV) has been used to measure the total antioxidant potential of different winemaking by-products. The electrochemical behavior of pomace, seeds, skins and stems was measured by CV and lipid peroxidation inhibition by thiobarbituric acid reactive substances (TBARS) method. Differences for the electrochemical parameter were found between the by-products, pomace and seeds, which presented the greatest voltammetric peak area...
April 1, 2017: Talanta
https://www.readbyqxmd.com/read/28117630/preventing-false-negatives-for-histochemical-detection-of-phenolics-and-lignins-in-peg-embedded-plant-tissues
#17
Bruno G Ferreira, Renan Falcioni, Lubia M Guedes, Sofia C Avritzer, Werner C Antunes, Luiz A Souza, Rosy M S Isaias
Polyethylene glycol (PEG) is a low-cost and advantageous embedding medium, which maintains the majority of cell contents unaltered during the embedding process. Some hard or complex plant materials are better embedded in PEG than in other usual embedding media. However, the histochemical tests for phenolics and lignins in PEG-embedded plant tissues commonly result in false negatives. We hypothesize that these false negatives should be prevented by the use of distinct fixatives, which should avoid the bonds between PEG and phenols...
February 2017: Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society
https://www.readbyqxmd.com/read/28106217/flavanol-concentrations-do-not-predict-dipeptidyl-peptidase-iv-inhibitory-activities-of-four-cocoas-with-different-processing-histories
#18
Caroline M Ryan, Weslie Khoo, Amanda C Stewart, Sean F O'Keefe, Joshua D Lambert, Andrew P Neilson
Cocoa and its constituent bioactives (particularly flavanols) have reported anti-diabetic and anti-obesity activities. One potential mechanism of action is inhibition of dipeptidyl peptidase-IV (DPP4), the enzyme that inactivates incretin hormones such as glucagon-like peptide-1 and gastric inhibitory peptide. The objective of this study was to determine the DPP4 inhibitory activities of cocoas with different processing histories, and identify processing factors and bioactive compounds that predict DPP4 inhibition...
January 20, 2017: Food & Function
https://www.readbyqxmd.com/read/28103873/masquelier-s-grape-seed-extract-from-basic-flavonoid-research-to-a-well-characterized-food-supplement-with-health-benefits
#19
REVIEW
Antje R Weseler, Aalt Bast
Careful characterization and standardization of the composition of plant-derived food supplements is essential to establish a cause-effect relationship between the intake of that product and its health effect. In this review we follow a specific grape seed extract containing monomeric and oligomeric flavan-3-ols from its creation by Jack Masquelier in 1947 towards a botanical remedy and nutraceutical with proven health benefits. The preparation's research history parallels the advancing insights in the fields of molecular biology, medicine, plant and nutritional sciences during the last 70 years...
January 19, 2017: Nutrition Journal
https://www.readbyqxmd.com/read/28100284/role-of-flavonoids-and-nitrates-in-cardiovascular-health
#20
Julie A Lovegrove, Alex Stainer, Ditte A Hobbs
CVD remain the leading cause of death globally. Effective dietary strategies for their reduction are of high priority. Increasing evidence suggests that phytochemicals, particularly dietary flavonoids and nitrates, are key modulators of CVD risk reduction through impact on multiple risk factors. The aim of this review is to explore the evidence for the impact of flavonoid- and nitrate-rich foods and supplements on CVD risk, with specific reference to their importance as mediators of vascular health and platelet function...
January 19, 2017: Proceedings of the Nutrition Society
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