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Browning polyphenols

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https://www.readbyqxmd.com/read/29163391/colletotrichum-gloeosporioides-contaminated-tea-infusion-blocks-lipids-reduction-and-induces-kidney-damage-in-mice
#1
Jin Li, Kang Sun, Qingping Ma, Jin Chen, Le Wang, Dingjun Yang, Xuan Chen, Xinghui Li
When the homogenate of fresh tea tree leaves was fermented to produce black tea beverage, the Colletotrichum gloeosporioides (main pathogen or endophyte of Camellia sinensis) may be mixed into the fermentation liquor. However, it was unclear whether C. gloeosporioides-contaminated tea beverage would damage human health. Therefore, we investigated the changes of functional components and the influences on mice. C. gloeosporioides was added to the green tea infusion. After cultivation of 48 h, tea polyphenols, caffeine, and L-theanine decreased by 31...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29157606/high-performance-thin-layer-chromatography-hptlc-direct-bioautography-as-a-method-of-choice-for-alpha-amylase-and-antioxidant-activity-evaluation-in-marine-algae
#2
Snezana Agatonovic-Kustrin, David W Morton
High-Performance Thin-layer chromatography (HPTLC) combined with DPPH free radical method and α-amylase bioassay was used to compare antioxidant and antidiabetic activities in ethanol and ethyl acetate extracts from 10 marine macroalgae species (3 Chlorophyta, 4 Phaeophyta and 3 Rhodophyta) from Blue Lagoon beach (Malaysia). Samples were also evaluated for their phenolic and stigmasterol content. On average, higher antioxidant activity was observed in the ethyl acetate extracts (55.1mg/100g gallic acid equivalents (GAE) compared to 35...
November 14, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29129902/quantification-of-fraglide-1-a-new-functional-ingredient-in-vinegars
#3
Aydan H Yatmaz, Tetsuaki Kinoshita, Akio Miyazato, Masahiro Takagi, Yoshio Tsujino, Fumiaki Beppu, Naohiro Gotoh
Vinegar is a widely used condiment in the world, and is produced from ethanol by acetic acid fermentation. Different fruits, vegetables, cereals, and wines can be used as ingredients for vinegar production. It is known that vinegar has many nutrient components such as organic acids, polyphenols, and aromatic compounds. Because of these bioactive components, it has many health benefits. China has a long history of producing vinegar and has been using it for health products and as medicine. Chinese aromatic Zhenjiang vinegar (Kozu) is produced from sticky rice...
November 13, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/29125293/oxidation-of-wine-polyphenols-by-secretomes-of-wild-botrytis-cinerea-strains-from-white-and-red-grape-varieties-and-determination-of-their-specific-laccase-activity
#4
Sabrina Zimdars, Julia Hitschler, Andreas Schieber, Fabian Weber
Processing of Botrytis cinerea infected grapes leads to enhanced enzymatic browning reactions mainly caused by the enzyme laccase which is able to oxidize a wide range of phenolic compounds. The extent of color deterioration depends on the activity of the enzymes secreted by the fungus. The present study revealed significant differences in the oxidative properties of secretomes of several B. cinerea strains isolated from five grape varieties. The presumably laccase containing secretomes varied in their catalytic activity toward six phenolic compounds present in grapes...
November 10, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29125219/effects-of-a-grapevine-shoot-extract-containing-resveratrol-and-resveratrol-oligomers-on-intestinal-adenoma-development-in-mice-in-vitro-and-in-vivo-studies
#5
Michael T Empl, Hong Cai, Shan Wang, Johannes Junginger, Tina Kostka, Marion Hewicker-Trautwein, Karen Brown, Andreas J Gescher, Pablo Steinberg
SCOPE: Evidence suggests that the dietary consumption of plant extracts containing polyphenols might help prevent the onset of cancers of the gastrointestinal tract. In the present study, the chemopreventive and antiproliferative efficacy of a grapevine shoot extract (Vineatrol(®) 30) containing resveratrol and resveratrol oligomers was investigated in vivo and in vitro. METHODS AND RESULTS: The in vivo study was performed using Apc(Min) mice on a high-fat diet, which represents a model of human adenomatous polyposis, while the potential of the extract as well as some of its isolated constituents to inhibit intestinal adenoma cell proliferation in vitro was investigated using APC10...
November 10, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/29061705/polyphenol-and-caffeine-rich-post-fermented-pu-er-tea-improves-diet-induced-metabolic-syndrome-by-remodeling-intestinal-homeostasis-in-mice
#6
Xiaoyu Gao, Qiuhong Xie, Ping Kong, Ling Liu, Sheng Sun, Boyu Xiong, Baojia Huang, Liang Yan, Jun Sheng, Hongyu Xiang
Post-fermented Pu-er tea (PE) protects against metabolic syndrome (MS), but little is known regarding its underlying mechanisms. Animal experiments were performed to determine whether gut microbiota mediated the improvement in diet-induced MS by PE and its main active components (PEAC). We confirmed that PE altered the body composition and energy efficiency; attenuated metabolic endotoxemia and systemic and multiple-tissue inflammation; and improved the glucose and lipid metabolism disorder in high-fat diet (HFD)-fed mice via multiple pathways...
October 23, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29055247/optimization-and-validation-of-reverse-phase-hplc-method-for-qualitative-and-quantitative-assessment-of-polyphenols-in-seaweed
#7
Gaurav Rajauria
A simple reverse phase-high performance liquid chromatography (RP-HPLC) coupled to a diode array detector (DAD) and negative ion electrospray mass spectrometer (ESI-MS) method was developed for simultaneous identification and quantification of phenolic antioxidants in seaweed. The proposed method was validated in terms of linearity, limits of detection (LOD), limits of quantification (LOQ), recovery and intermediate precision. The calibration curves were linear with correlation coefficient ranging from 0.9909 to 0...
October 13, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29027275/multifaceted-supramolecular-interactions-from-c-methylresorcin-4-arene-lead-to-an-enhancement-in-in-vitro-antibacterial-activity-of-gatifloxacin
#8
Arnab Dawn, Harish Chandra, Chandra Ade-Browne, Jagjit Yadav, Harshita Kumari
Mimicking the antibacterial activity of polyphenols in synthetic systems is an attractive approach for the development of novel active pharmaceutical ingredients. Resorcinarenes represent a class of polyphenols which have been exploited for decades for their attractive chemical scaffold suitable for forming host-guest complexes with hydrophobic guest molecules. However, the polyphenolic character of resorcinarenes, which could be a potential asset to the pharmaceutical industry, have been least exploited. The present work represents an unprecedented interplay of chemical nature of resorcinarene conferring an antimicrobial activity together with its ability to interact with an antibacterial drug gatifloxacin, improving the overall antibacterial activity...
October 12, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29017399/recombinant-expression-purification-and-characterization-of-polyphenol-oxidase-2-vvppo2-from-shine-muscat-vitis-labruscana-bailey-%C3%A3-vitis-vinifera-l
#9
Ayako Katayama-Ikegami, Yuka Suehiro, Takane Katayama, Kazushi Jindo, Hiroyuki Itamura, Tomoya Esumi
Polyphenol oxidases (PPOs) catalyze browning reactions in various plant organs, therefore controlling the reactions is important for the food industry. PPOs have been assumed to be involved in skin browning of white grape cultivars; however, the molecular mechanism underlying PPO-mediated browning process remains elusive. We have recently identified a new PPO gene named VvPPO2 from "Shine Muscat" (Vitis labruscana Bailey × V. vinifera L.), and have shown that the gene is transcribed at a higher level than the previously identified VvPPO1 in browning, physiologically disordered berry skins at the maturation stage...
October 11, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28974022/effect-of-green-and-brown-propolis-extracts-on-the-expression-levels-of-micrornas-mrnas-and-proteins-related-to-oxidative-stress-and-inflammation
#10
Vincenzo Zaccaria, Valeria Curti, Arianna Di Lorenzo, Alessandra Baldi, Cristina Maccario, Sabrina Sommatis, Roberto Mocchi, Maria Daglia
A large body of evidence highlights that propolis exerts many biological functions that can be ascribed to its antioxidant and anti-inflammatory components, including different polyphenol classes. Nevertheless, the molecular mechanisms are yet unknown. The aim of this study is to investigate the mechanisms at the basis of propolis anti-inflammatory and antioxidant activities. The effects of two brown and green propolis extracts-chemically characterized by RP-HPLC-PDA-ESI-MSn-on the expression levels of miRNAs associated with inflammatory responses (miR-19a-3p and miR-203a-3p) and oxidative stress (miR-27a-3p and miR-17-3p), were determined in human keratinocyte HaCat cell lines, treated with non-cytotoxic concentrations...
October 1, 2017: Nutrients
https://www.readbyqxmd.com/read/28958519/full-inhibition-of-enzymatic-browning-in-the-presence-of-thiol-functionalised-silica-nanomaterial
#11
Sara Muñoz-Pina, José V Ros-Lis, Ángel Argüelles, Carmen Coll, Ramón Martínez-Máñez, Ana Andrés
Darkening processed fruits and vegetables is caused mainly by enzymatic browning through polyphenol oxidase (PPO) action. Accordingly, we explored the potential of four silica-based materials (MCM-41 nanometric size, MCM-41 micrometric size, UVM-7 and aerosil), non-functionalised and functionalised with thiol groups, to inhibit PPO activity in the model system and apple juice. All materials showed relevant performance when immobilising and inhibiting PPO in model systems, and support topology is a main factor for enzyme immobilisation and inhibition...
February 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28946360/structure-dependent-antioxidant-capacity-of-phlorotannins-from-icelandic-fucus-vesiculosus-by-uhplc-dad-ecd-qtofms
#12
Ditte B Hermund, Merichel Plaza, Charlotta Turner, Rosa Jónsdóttir, Hordur G Kristinsson, Charlotte Jacobsen, Kristian Fog Nielsen
Brown algae are rich in polyphenolic compounds, phlorotannins, which have been found to possess high in vitro antioxidant capacity, especially DPPH radical scavenging activity, due to the high number of hydroxyl groups. Whereas, the overall antioxidant capacity of brown algae extracts has been widely studied, the antioxidant capacity of individual phlorotannins has been rarely explored. The aim of this study was to determine the structure dependant antioxidant capacity of phlorotannins from Icelandic brown algae, Fucus vesiculosus...
February 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28899482/enzymatic-synthesis-of-chlorogenic-acid-glucoside-using-dextransucrase-and-its-physical-and-functional-properties
#13
Seung-Hee Nam, Jin-A Ko, Woojin Jun, Young-Jung Wee, Marie K Walsh, Kwang-Yeol Yang, Jin-Ho Choi, Jon-Bang Eun, Jeong Choi, Young-Min Kim, Songhee Han, Thi Thanh Hanh Nguyen, Doman Kim
Chlorogenic acid, a major polyphenol in edible plants, possesses strong antioxidant activity, anti-lipid peroxidation and anticancer effects. It used for industrial applications; however, this is limited by its instability to heat or light. In this study, we for the first time synthesized chlorogenic acid glucoside (CHG) via transglycosylation using dextransucrase from Leuconostoc mesenteroides and sucrose. CHG was purified and its structure determined by nuclear magnetic resonance and matrix-associated laser desorption ionization-time-of-flight mass spectroscopy...
December 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28888889/biofabrication-of-polyphenols-coated-nano-palladium-and-its-in-vitro-cytotoxicity-against-human-leukemia-cell-lines-k562
#14
Yingchun Li, Huihan Wang, Rong Zhang, Guojun Zhang, Ying Yang, Zhuogang Liu
The biofabrication of palladium nanoparticles (PdNPs) using aqueous leaf extract of Pelargonium graveolens is reported herein. The polyphenols present in the Pelargonium graveolens extract are mainly responsible for reduction and subsequent stabilization of formed PdNPs. UV-Visible spectroscopy (UV-Vis) absorption and reaction color change from yellow to brown indicated the formation of PdNPs. The as synthesized PdNPs were studied by using characterization techniques such as Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), Energy dispersive spectroscopy (EDS), Zeta potential measurements and Selected area electron diffraction (SAED)...
July 25, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28873535/effect-of-ascorbic-acid-postharvest-treatment-on-enzymatic-browning-phenolics-and-antioxidant-capacity-of-stored-mung-bean-sprouts
#15
Małgorzata Sikora, Michał Świeca
Enzymatic browning limits the postharvest life of minimally processed foods, thus the study selected the optimal inhibitors of polyphenol oxidase (PPO) and evaluated their effect on enzymatic browning, phenolics and antioxidant capacity of stored mung bean sprouts. The sprouts treated with 2mM and 20mM ascorbic acid had a lowered PPO activity; compared to the control by 51% and 60%, respectively. The inhibition was reflected in a significant decrease in enzymatic browning. The sprouts treated with 20mM ascorbic acid had 22% and 23% higher phenolic content after 3 and 7days of storage, respectively...
January 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28863365/a-polyphenolic-extract-from-green-tea-leaves-activates-fat-browning-in-high-fat-diet-induced-obese-mice
#16
Audrey M Neyrinck, Laure B Bindels, Lucie Geurts, Matthias Van Hul, Patrice D Cani, Nathalie M Delzenne
Fat browning has emerged as an attractive target for the treatment of obesity and related metabolic disorders. Its activation leads to increased energy expenditure and reduced adiposity, thus contributing to a better energy homeostasis. Green tea extracts (GTEs) were shown to attenuate obesity and low-grade inflammation and to induce the lipolytic pathway in the white adipose tissue (WAT) of mice fed a high-fat diet. The aim of the present study was to determine whether the antiobesity effect of an extract from green tea leaves was associated with the activation of browning in the WAT and/or the inhibition of whitening in the brown adipose tissue (BAT) in HF-diet induced obese mice...
November 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28843018/browning-in-apples-exploring-the-biochemical-basis-of-an-easily-observable-phenotype
#17
Charles E Deutch
Many fruits and vegetables undergo browning when they are cut and the tissue is exposed to the air. This is due to the activity of the enzyme polyphenol oxidase (PPO, EC 1.14.18.1) with endogenous substrates. In this laboratory experiment, students prepare slices of different varieties of apples and assess the rate of browning. They make a simple extract of the apple tissue and measure the activity of PPO using 3,4-dihydroxy-l-phenylalanine (l-DOPA) as substrate. They determine the protein concentration of the extract with the Bradford Coomassie Blue reagent and calculate the specific activity of PPO...
August 26, 2017: Biochemistry and Molecular Biology Education
https://www.readbyqxmd.com/read/28835121/comparative-analysis-of-thermal-assisted-high-pressure-and-thermally-processed-mango-pulp-influence-of-processing-packaging-and-storage
#18
Neelima Kaushik, P Srinivasa Rao, H N Mishra
Storage stability and shelf-life of mango pulp packed in three different packaging films and processed using an optimized thermal-assisted high pressure processing treatment 'HPP' (600 MPa/52 ℃/10 min) was analyzed during refrigerated (5 ℃) and accelerated (37 ℃) storage and compared with the conventional thermal treatment 'TT' (0.1 MPa/95 ℃/15 min). After processing, HPP resulted in relatively lower total color difference (3.5), retained higher ascorbic acid (95%), total phenolics (106%), total flavonoids content (118%) in mango pulp compared to TT, with values of 5...
January 1, 2017: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/28821733/three-recombinantly-expressed-apple-tyrosinases-suggest-the-amino-acids-responsible-for-mono-versus-diphenolase-activity-in-plant-polyphenol-oxidases
#19
Ioannis Kampatsikas, Aleksandar Bijelic, Matthias Pretzler, Annette Rompel
Tyrosinases and catechol oxidases belong to the polyphenol oxidase (PPO) enzyme family, which is mainly responsible for the browning of fruits. Three cDNAs encoding PPO pro-enzymes have been cloned from leaves of Malus domestica (apple, MdPPO). The three pro-enzymes MdPPO1-3 were heterologously expressed in E. coli yielding substantial amounts of protein and have been characterized with regard to their optimum of activity resulting from SDS, acidic and proteolytic activation. Significant differences were found in the kinetic characterization of MdPPO1-3 when applying different mono- and diphenolic substrates...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818380/molecular-cloning-and-expression-analysis-of-duplicated-polyphenol-oxidase-genes-reveal-their-functional-differentiations-in-sorghum
#20
Song Yan, Sujuan Li, Guowei Zhai, Ping Lu, Hui Deng, Shan Zhu, Renliang Huang, Jianfeng Shao, Yuezhi Tao, Guihua Zou
Polyphenol oxidase (PPO) is believed to play a role in plant growth, reproduction, and resistance to pathogens and pests. PPO causes browning of grains in cereals. In this study, genetic mapping of sorghum grain for phenol color reaction (PHR) was performed using a recombinant inbred line population. Only one locus was detected between SSR markers SM06072 and Xtxp176 on chromosome 6. Two linked orthologous genes (Sb06PPO1 and Sb06PPO2) within the mapped region were discovered and cloned. Transformation experiments using Nipponbare (a PHR negative rice cultivar) showed that Sb06PPO1 from LTR108 and two Sb06PPO2 alleles from both varieties could complement Nipponbare, whereas Sb06PPO1 from 654 could not...
October 2017: Plant Science: An International Journal of Experimental Plant Biology
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