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Browning polyphenols

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https://www.readbyqxmd.com/read/29751705/-enzymatic-characteristics-of-peroxidase-from-chrysanthemum-morifolium-cv-bo-ju
#1
Yu-Yun Zhu, Xin-Lin Lyu, Xiang-Wei Li, Dong Zhang, Li-Hua Dong, Jing-Jing Zhu, Zhi-Min Wang, Jin-Zhen Zhang
The enzymatic browning is one of the main reasons for affecting the quality of medicinal flowers. In the process of chrysanthemum harvesting and processing, improper treatment will lead to the browning and severely impact the appearance and quality of chrysanthemum. Peroxidase enzyme is one of the oxidoreductases that cause enzymatic browning of fresh chrysanthemum. The enzymatic characteristics of peroxidase (POD) in chrysanthemum were studied in this paper. In this experiment, the effects of different reaction substrates and their concentrations, PH value of buffer and reaction temperatures on the activity of POD enzyme were investigated...
April 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29691015/gradual-degradation-of-fucoidan-from-fucus-vesiculosus-and-its-effect-on-structure-antioxidant-and-antiproliferative-activities
#2
Eric Lahrsen, Inga Liewert, Susanne Alban
The fucose-containing sulfated polysaccharides (syn. fucoidans) from brown algae exhibit a wide range of bioactivities and are therefore considered promising candidates for health-supporting and medical applications. During the past three decades, research on isolation, molecular characterization, and screening of in vitro and in vivo pharmacological activities has significantly increased. Until now, however, fucoidans are only used as ingredients in cosmetics and food supplements, especially due to the proclaimed antioxidant activities of fucoidan...
July 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29685347/optical-method-for-detecting-oxygen-via-the-chromogenic-reaction-catalyzed-by-polyphenol-oxidase
#3
Abdelaziz Bouchaib, Abdellatif Ben Abdellah, Mohamed Bakkali, Amine Laglaoui, Abdelhay Arakrak, Carlo Carboni, Abdelaziz Benjouad, Amal Maurady
The present work describes a method for detecting the ingress of gas phase oxygen into packed food. It uses the enzyme polyphenol oxidase (PPO)from Mushroom and Mediterranean dwarf palm. The PPO is incorporated into an indubiose film along with a non-toxic polyphenol such as gallic acid or chlorogenic acid. If exposed to oxygen, the test spot undergoes an irreversible and visible color change from pale to deep brown due to the PPO catalyzed oxidation of the respective polyphenol by oxygen. The color change can be detected visually or by spectrophotometry at 470 nm...
July 2018: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/29680446/nutraceuticals-in-rodent-models-as-potential-treatments-for-human-inflammatory-bowel-disease
#4
REVIEW
Naga K R Ghattamaneni, Sunil K Panchal, Lindsay Brown
Inflammatory Bowel Disease (IBD) is characterized by chronic inflammation of all or part of the digestive tract. Nutraceuticals include bioactive compounds such as polyphenols with anti-inflammatory activities, thus these products have the potential to treat chronic inflammatory diseases. We have emphasized the role of nutraceuticals in ameliorating the symptoms of IBD in rodent models of human IBD through modulation of key pathogenic mechanisms including dysbiosis, oxidative stress, increased inflammatory cytokines, immune system dysregulation, and inflammatory cell signaling pathways...
April 19, 2018: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/29660118/effects-of-high-power-ultrasound-on-microflora-enzymes-and-some-quality-attributes-of-a-strawberry-drink
#5
Liyi Chen, Xiufang Bi, Xiamin Cao, Lei Liu, Zhenming Che
BACKGROUND: The objective of the present work was to study the effect of high power ultrasound (HPU) on microflora, enzymes and some quality attributes of a strawberry drink and to provide a theoretical basis for strawberry drinks processing, which was conducive to the development of more nutritious and healthier strawberry drinks. RESULTS: Fresh strawberry drink was subjected to HPU treatment at 20 kHz (242 W cm-2 , 605 W cm-2 and 968 W cm-2 ) for 2, 4, 6, 8, 10 min in an ice bath...
April 16, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29652940/functionality-of-cow-milk-naturally-enriched-with-polyunsaturated-fatty-acids-and-polyphenols-in-diets-for-diabetic-rats
#6
Emerson H Yoshimura, Nadine W Santos, Erica Machado, Bruna C Agustinho, Lucelia M Pereira, Sílvia C de Aguiar, Anacharis B Sá-Nakanishi, Cecília E Mareze-da-Costa, Lucia M Zeoula
The increasing incidence of diabetes mellitus is becoming a serious threat to human health in various parts of the world. Studies with dairy products have shown a potential beneficial effect against diabetes. This experiment evaluated the supplementation of milk naturally enriched with polyunsaturated fatty acids (PUFA) and polyphenols in rats with streptozotocin-induced diabetes. Forty male 28-day-old Wistar rats were distributed in four experimental treatments of diabetic animals (streptozotocin induction) and a normal group (non-induced)...
2018: PloS One
https://www.readbyqxmd.com/read/29642562/antioxidant-potential-of-extracts-obtained-from-macro-ascophyllum-nodosum-fucus-vesiculosus-and-bifurcaria-bifurcata-and-micro-algae-chlorella-vulgaris-and-spirulina-platensis-assisted-by-ultrasound
#7
Rubén Agregán, Paulo E S Munekata, Daniel Franco, Javier Carballo, Francisco J Barba, José M Lorenzo
Background: Natural antioxidants, which can replace synthetic ones due to their potential implications for health problems in children, have gained significant popularity. Therefore, the antioxidant potential of extracts obtained from three brown macroalgae ( Ascophyllum nodosum , Fucus vesiculosus and Bifurcaria bifurcata ) and two microalgae ( Chlorella vulgaris and Spirulina platensis ) using ultrasound-extraction as an innovative and green approach was evaluated. Methods: Algal extracts were obtained by ultrasound-assisted extraction using water/ethanol (50:50, v : v ) as the extraction solvent...
April 10, 2018: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/29622187/assessment-of-oxidation-compounds-in-oaked-chardonnay-wines-a-gc-ms-and-1-h-nmr-metabolomics-approach
#8
Joana Pinto, Ana Sofia Oliveira, Joana Azevedo, Victor De Freitas, Paulo Lopes, Isabel Roseira, Miguel Cabral, Paula Guedes de Pinho
The oxidation of oaked Chardonnay wine during long-term storage was studied by headspace solid-phase microextraction coupled to gas chromatography-mass spectrometry (HS-SPME-GC/MS) and proton (1 H) nuclear magnetic resonance (NMR) spectroscopy. Three distinct groups of wine were defined based on the browning index: control, least oxidized (OX1) and most oxidized (OX2). HS-SPME-GC/MS and1 H NMR spectroscopy enabled the profiling of a total of 155 compounds in all wine samples including aldehydes, ketones, esters, polyphenols, among other classes...
August 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29608894/food-polyphenols-targeting-peptidyl-prolyl-cis-trans-isomerase-pin1
#9
Masafumi Hidaka, Keita Kosaka, Saori Tsushima, Chiyoko Uchida, Katsuhiko Takahashi, Noriko Takahashi, Masayoshi Tsubuki, Yukihiko Hara, Takafumi Uchida
We searched for inhibitors against prolyl isomerase Pin1 in order to develop functional foods to prevent and cure various Pin1 related diseases such as cancer, diabetes, cardiovascular disease, Alzheimers's disease, and so on. We created a polyphenol library consisting of ingredients in healthy foods and beverages, since polyphenols like epigallocatechin gallate (EGCG) in green tea and 974B in brown algae had been identified as its Pin1 inhibitors. Several polyphenols such as EGCG derivatives, caffeic acid derivatives and tannic acid inhibited Pin1 activity...
March 30, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29580490/effect-of-whey-protein-isolate-films-incorporated-with-montmorillonite-and-citric-acid-on-the-preservation-of-fresh-cut-apples
#10
Viviane Machado Azevedo, Marali Vilela Dias, Heloisa Helena de Siqueira Elias, Katia Lumi Fukushima, Eric Keven Silva, João de Deus Souza Carneiro, Nilda de Fátima Ferreira Soares, Soraia Vilela Borges
The objective of this paper was to evaluate the effect of bioactive whey protein isolate/montmorillonite films containing citric acid on the inhibition of enzymatic browning and physicochemical properties in minimally processed apples. Whey protein isolate films incorporated with montmorillonite (3 g/100 g) and citric acid (5 and 10 g/100 g) were applied to the apples slices. All samples were packaged in polypropylene trays (14.6 cm × 11.4 cm × 6.5 cm) and stored at 5 ± 2 °C and 85 ± 3% RH for eight days...
May 2018: Food Research International
https://www.readbyqxmd.com/read/29495492/the-impact-of-a-single-dose-of-a-polyphenol-rich-seaweed-extract-on-postprandial-glycaemic-control-in-healthy-adults-a-randomised-cross-over-trial
#11
Margaret Murray, Aimee L Dordevic, Lisa Ryan, Maxine P Bonham
This study investigated the impact of a polyphenol-rich seaweed extract on postprandial glycaemia in healthy adults, and, as a secondary outcome, the influence of ethnicity on these outcomes. Thirty-eight volunteers (26 non-Asian, 12 Asian) aged 19 to 56 years participated in this double-blind, placebo-controlled, randomised cross-over trial. Participants each consumed a low (500 mg), and high (2000 mg) dose of the polyphenol-rich brown seaweed ( Fucus vesiculosus ) extract, as well as a cellulose placebo (2000 mg), 30 min prior to 50 g of available carbohydrate from white bread...
February 27, 2018: Nutrients
https://www.readbyqxmd.com/read/29492640/a-lab-scale-model-system-for-cocoa-bean-fermentation
#12
Edwina Romanens, Rebecca Näf, Tobias Lobmaier, Vasilisa Pedan, Susette Freimüller Leischtfeld, Leo Meile, Susanne Miescher Schwenninger
Lab-scale systems modelling the spontaneous cocoa bean fermentation process are useful tools to research the influence of process parameters on the fermentation and the final bean quality. In this study in Honduras, a 1-kg lab-scale fermentation (LS-F) was compared to a 300-kg on-farm fermentation (OF-F) in a multiphasic approach, analysing microbial counts, microbial species diversity, physico-chemical parameters, and final dried bean quality. Yeast and total aerobic counts of up to 8 log CFU/g during the LS-F were comparable to the OF-F, while counts for lactic acid bacteria and acetic acid bacteria were up to 3 log CFU/g lower during the LS-F than during the OF-F...
April 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29478533/swertiajaponin-as-an-anti-browning-and-antioxidant-flavonoid
#13
Kyoung Mi Moon, Bonggi Lee, Won-Kyung Cho, Bong-Seon Lee, Choon Young Kim, Jin Yeul Ma
Enzymatic browning is a major issue that needs to be solved in the food industry. Although swertiajaponin is a flavonoid rich in the whole herb of Swertia japonica that has been clinically used, its biological functions and applicat​ion in the foods have not been fully elucidated. Here, we showed that swertiajaponin efficiently blocked enzymatic browning in potatoes possibly by direct binding to and inactivating polyphenol oxidase. Furthermore, swertiajaponin showed potent antioxidant activity proven by markedly suppressed reactive oxygen species...
June 30, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29410827/eco-dyeing-with-biocolourant-based-on-natural-compounds
#14
Fubang Wang, Jixian Gong, Yanfei Ren, Jianfei Zhang
Biomass pigments have been regarded as promising alternatives to conventional synthetic dyestuffs for the development of sustainable and clean dyeing. This investigation focused on in situ dyeing of fabrics with biopigments derived from tea polyphenols via non-enzymatic browning reaction. The average particle size of dyed residual liquor with natural tea polyphenol was 717.0 nm (ranging from 615.5 to 811.2 nm), and the Integ value of dyed wool fabrics was the greatest compared to those of counterparts. In addition, the Integ values of dyed fabrics with residual liquor were much bigger than those with the first reaction solutions when dyed by identical dyeing liquor...
January 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29405636/dietary-curcumin-intervention-targets-mouse-white-adipose-tissue-inflammation-and-brown-adipose-tissue-ucp1-expression
#15
Zhuolun Song, Xavier Revelo, Weijuan Shao, Lili Tian, Kejing Zeng, Helena Lei, Hong-Shuo Sun, Minna Woo, Daniel Winer, Tianru Jin
OBJECTIVE: This study aimed to determine whether dietary curcumin intervention targets both white adipose tissue (WAT) inflammation and brown adipose tissue (BAT)-mediated energy expenditure. METHODS: C57BL/6J mice were fed with a low-fat diet, high-fat diet (HFD), or HFD plus curcumin. In addition to assessing the effect of curcumin intervention on metabolic profiles, this study assessed WAT macrophage infiltration and composition and inflammatory cytokine production...
March 2018: Obesity
https://www.readbyqxmd.com/read/29378003/dietary-tea-polyphenol-supplementation-improved-egg-production-performance-albumen-quality-and-magnum-morphology-of-hy-line-brown-hens-during-the-late-laying-period
#16
Xiao-Cui Wang, Xiao-Hong Wang, Jing Wang, Hao Wang, Hai-Jun Zhang, Shu-Geng Wu, Guang-Hai Qi
The aim of this study was to investigate how dietary supplementation of tea polyphenols (TP) and tea catechins (TC) affect laying performance, albumen quality, ovomucin composition, and magnum morphology of laying hens in the late phase of production. Two hundred seventy Hy-Line Brown laying hens (64 wk old) were assigned to a basal diet (the control), the basal diet supplemented with 200 mg/kg tea polyphenols (TP200) or 200 mg/kg tea catechins (TC200). Each treatment had 6 replicates with 15 hens each. The feeding trial lasted 10 wks...
February 15, 2018: Journal of Animal Science
https://www.readbyqxmd.com/read/29322691/raspberry-supplementation-improves-insulin-signaling-and-promotes-brown-like-adipocyte-development-in-white-adipose-tissue-of-obese-mice
#17
Tong Xing, Yifei Kang, Xinglian Xu, Bo Wang, Min Du, Mei-Jun Zhu
SCOPE: Excessive lipid accumulation in white adipose tissue (WAT) leads to chronic inflammation and metabolic dysfunction. Raspberry (RB) contains high amount of polyphenols and dietary fibers. The objective of the study is to evaluate the effects of RB supplementation on WAT morphology, inflammation, and insulin signaling in high fat diet (HFD)-induced obese mice, and further explore the underlying mechanisms. METHODS AND RESULTS: C57BL/6J mice are fed with a control diet or a HFD supplemented with 0 or 5% freeze dried RB for 12 weeks...
March 2018: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/29291143/comparative-study-of-the-banana-pulp-browning-process-of-giant-dwarf-and-fhia-23-during-fruit-ripening-based-on-image-analysis-and-the-polyphenol-oxidase-and-peroxidase-biochemical-properties
#18
Pilar Escalante-Minakata, Vrani Ibarra-Junquera, José de Jesús Ornelas-Paz, Victoria García-Ibáñez, José J Virgen-Ortíz, Apolinar González-Potes, Jaime D Pérez-Martínez, Mario Orozco-Santos
This work presents a novel method to associate the polyphenol oxidase (PPO) and the peroxidase (POD) activities with the ripening-mediated color changes in banana peel and pulp by computational image analysis. The method was used to follow up the de-greening of peel and browning of homogenized pulp from 'Giant Dwarf' (GD: Musa AAA, subgroup Cavendish) and FHIA-23 (tetraploid hybrid, AAAA) banana cultivars. In both cultivars, the color changes of peel during the ripening process clearly showed four stages, which were used to group the fruit into ripening stages...
January 2018: 3 Biotech
https://www.readbyqxmd.com/read/29287342/inhibitory-effects-of-edible-seaweeds-polyphenolics-and-alginates-on-the-activities-of-porcine-pancreatic-%C3%AE-amylase
#19
Nazikussabah Zaharudin, Armando Asunción Salmeán, Lars Ove Dragsted
Edible seaweeds are valuable because of their organoleptic properties and complex polysaccharide content. A study was conducted to investigate the potential of dried edible seaweed extracts, its potential phenolic compounds and alginates for α-amylase inhibitory effects. The kinetics of inhibition was assessed in comparison with acarbose. The methanol extract of Laminaria digitata and the acetone extract of Undaria pinnatifida showed inhibitory activity against α-amylase, IC50 0.74 ± 0.02 mg/ml and 0...
April 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29251618/-evaluation-of-adjuvant-effects-of-fucoidane-from-brown-seaweed-fucus-evanescens-and-its-structural-analogues-for-the-strengthening-vaccines-effectiveness
#20
T A Kuznetsova, L A Ivanushko, E V Persiyanova, A L Shutikova, S P Ermakova, M Yu Khotimchenko, N N Besednova
The use of sulfated polysaccharides from brown seaweed Fucus evanescens as adjuvants (native fucoidan in combination with polyphenols, fucoidan without polyphenols, a product of enzymatic hydrolysis of fucoidan) stimulated the formation of specific antibodies to the surface antigen of the hepatitis B virus (HBs-AG). Immunization of mice with vaccine compositions containing HBs-AG and fucoidan samples resulted in increasing the serum level of the pro-inflammatory (TNF-a, IFN-g, IL-2) cytokines. Increased production of these cytokines was detected in the culture of splenocytes additionally stimulated in vitro by fucoidans or phytohemagglutinin...
November 2017: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
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