keyword
MENU ▼
Read by QxMD icon Read
search

Flavanols

keyword
https://www.readbyqxmd.com/read/28421745/molecular-approach-of-the-synergistic-effect-on-astringency-elicited-by-mixtures-of-flavanols
#1
Alba M Ramos-Pineda, Ignacio García-Estévez, Natércia Fernandes Brás, Eva M Martin Del Valle, Montserrat Duenas, M Teresa Escribano-Bailon
The interactions between salivary proteins and wine flavanols (catechin, epicatechin and mixtures catechin+epicatechin) have been studied by HPLC-DAD, Isothermal Titration Microcalorimetry and Molecular Dynamics simulations. Chromatographic results suggest that the presence of these flavanol mixtures could facilitate the formation of precipitates to the detriment of soluble aggregates. The comparison between the thermodynamic parameters obtained showed remarkable higher negative values of ΔG in the system containing the mixture of both flavanols in comparison to the systems containing individual flavanols, indicating a more favourable scenario in the mixing system...
April 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28397240/relationship-between-hyperspectral-indices-agronomic-parameters-and-phenolic-composition-of-vitis-vinifera-cv-tempranillo-grapes
#2
Ignacio García-Estévez, Natalia Quijada-Morín, Julián C Rivas-Gonzalo, José Martínez-Fernández, Nilda Sánchez, Carlos M Herrero-Jiménez, M Teresa Escribano-Bailón
BACKGROUND: Phenolic composition of grapes is key when making decisions about harvest date in order to assure the quality of grapes. This work aimed to study the relation between the detailed phenolic composition of grapes and agronomic parameters and hyperspectral indices, these latter measured through field radiometry techniques. RESULTS: Good correlations were found between phenolic composition (both anthocyanin and flavanol composition) and some hyperspectral indices related to vigor, such as the Normalized Difference Vegetation Index (NDVI) and the Soil Adjusted Vegetation Index (SAVI)...
April 10, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28391283/mothers-consumption-of-soy-drink-but-not-black-tea-increases-the-flavonoid-content-of-term-breast-milk-a-pilot-randomized-controlled-intervention-study
#3
Frank Jochum, Birgit Alteheld, Pamela Meinardus, Norbert Dahlinger, Antonia Nomayo, Peter Stehle
OBJECTIVE: We performed a pilot RCT to prove the hypothesis that a controlled ingestion of polyphenol-rich beverages (soy drink, decaffeinated black tea) in nutritive dosages by nursing women has an effect on the composition (flavonoid concentration, total antioxidant capacity) of breast milk. METHODS: Healthy nursing women were supplemented with either 250 mL of a soy drink (12 mg isoflavones; n = 18), 300 mL decaffeinated black tea (67 mg catechins; n = 18), or 300 mL water (n = 8, control) for 6 days...
April 8, 2017: Annals of Nutrition & Metabolism
https://www.readbyqxmd.com/read/28388357/quercetin-inhibits-advanced-glycation-end-product-formation-via-chelating-metal-ions-trapping-methylglyoxal-and-trapping-reactive-oxygen-species
#4
Mohammad Nazrul Islam Bhuiyan, Shinya Mitsuhashi, Kengo Sigetomi, Makoto Ubukata
Physiological concentration of Mg(2+), Cu(2+), and Zn(2+) accelerated AGE formation only in glucose-mediated conditions, which was effectively inhibited by chelating ligands. Only quercetin (10) inhibited MGO-mediated AGE formation as well as glucose- and ribose-mediated AGE formation among 10 polyphenols (1-10) tested. We performed an additional structure-activity relationship (SAR) study on flavanols (10, 11, 12, 13, and 14). Morin (12) and kaempherol (14) showed inhibitory activity against MGO-mediated AGE formation, whereas rutin (11) and fisetin (13) did not...
May 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28382623/double-maturation-raisonn%C3%A3-e-the-impact-of-on-vine-berry-dehydration-on-the-berry-and-wine-composition-of-merlot-vitis-vinifera-l
#5
Denis Rusjan, Maja Mikulic-Petkovsek
BACKGROUND: Double Maturation Raisonnée (DMR) is a potential canopy measure that affects grape and wine composition. The aim of this work was to study for the first time the DMR impact on the physical, biochemical and sensorial characteristics of the berries and wines of Merlot, one of the world's fastest-expanding grapevine varieties. RESULTS: DMR significantly increased the content of soluble solids (1.2-fold), free amino nitrogen (1.8-fold) and acidity in berries but decreased the weight of 100 berries on harvest (approx...
April 6, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28353678/assessment-of-lipophilicity-indices-derived-from-retention-behavior-of-antioxidant-compounds-in-rp-hplc
#6
Ioana Anamaria Sima, Agata Kot-Wasik, Andrzej Wasik, Jacek Namieśnik, Costel Sârbu
Reverse phase high pressure liquid chromatography was employed in order to evaluate the lipophilicity of antioxidant compounds from different classes, such as phenolic acids, flavanones, flavanols, flavones, anthocyanins, stilbenes, xantonoids, and proanthocyanidins. The retention time of each compound was measured using five different HPLC columns: RP18 (LiChroCART, Purosphere RP-18e), C8 (Zorbax, Eclipse XDBC8), C16-Amide (Discovery RP-Amide C16), CN100 (Saulentechnik, Lichrosphere), and pentafluorophenyl (Phenomenex, Kinetex PFP), and the mobile phase consisted of methanol and water (0...
March 29, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28341432/development-validation-and-evaluation-of-an-analytical-method-for-the-determination-of-monomeric-and-oligomeric-procyanidins-in-apple-extracts
#7
Wendy J Hollands, Stefan Voorspoels, Griet Jacobs, Kjersti Aaby, Ane Meisland, Rocio Garcia-Villalba, Francisco Tomas-Barberan, Mariusz K Piskula, Deborah Mawson, Irena Vovk, Paul W Needs, Paul A Kroon
There is a lack of data for individual oligomeric procyanidins in apples and apple extracts. Our aim was to develop, validate and evaluate an analytical method for the separation, identification and quantification of monomeric and oligomeric flavanols in apple extracts. To achieve this, we prepared two types of flavanol extracts from freeze-dried apples; one was an epicatechin-rich extract containing ∼30% (w/w) monomeric (-)-epicatechin which also contained oligomeric procyanidins (Extract A), the second was an oligomeric procyanidin-rich extract depleted of epicatechin (Extract B)...
April 28, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28340743/linking-atr-ftir-and-raman-features-to-phenolic-extractability-and-other-attributes-in-grape-skin
#8
Julio Nogales-Bueno, Berta Baca-Bocanegra, Abigail Rooney, José Miguel Hernández-Hierro, Francisco José Heredia, Hugh J Byrne
The importance of wine phenolics on the sensory characteristic of red wines is well-known. Therefore, it is necessary to control the extractability of phenolic compounds from grape skins, which depends significantly on grape ripeness and hence, on cell wall degradation. In the present study, attenuated total reflectance Fourier transform infrared (ATR-FTIR) and Raman spectra of grape skin have been recorded. Then, these spectral matrices have been studied and the main spectral features have been linked to extractabilities of phenolic compounds (anthocyanins, flavanols and total phenols)...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28317766/first-evidences-of-interaction-between-pyranoanthocyanins-and-salivary-proline-rich-proteins
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
keyword
keyword
112401
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"