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https://www.readbyqxmd.com/read/28407909/effect-of-temperature-and-relative-humidity-on-stability-following-simulated-gastro-intestinal-digestion-of-microcapsules-of-bordo-grape-skin-phenolic-extract-produced-with-different-carrier-agents
#1
Luiza Siede Kuck, Júlia Lerina Wesolowski, Caciano Pelayo Zapata Noreña
The stability of microparticles of Bordo grape skin aqueous extract, produced by spray-drying and freeze-drying using polydextrose (5%) and partially hydrolyzed guar gum (5%), was evaluated under accelerated conditions (75 and 90% relative humidity, at 35, 45, and 55°C for 35days) and simulated gastrointestinal digestion. The temperature had a significant effect on the reduction of phenolics content, with retentions varying from 82.5 to 93.5%. The retention of total monomer anthocyanins were in the range of 3...
September 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28402599/obtention-and-characterization-of-dried-gels-prepared-with-whey-proteins-honey-and-hydrocolloids-mixture
#2
Ana C Rodriguez, Martín R Torrez, Alba S Navarro, Diego K Yamul
BACKGROUND: Large amounts of honey and liquid whey derived from the dairy industry are produced in Argentina. Honey is exported in bulk and whey is transformed into whey protein concentrates and isolates. The objective of this work was to investigate the effect of pH, composition and storage time on the properties of dried gels with honey, whey proteins and hydrocolloids. RESULTS: Colour properties varied according to pH and composition. The fracture stress of the dried gels prepared with corn starch was higher than those prepared with guar gum in all conditions assayed...
April 12, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28401089/rheological-differences-of-waxy-barley-flour-dispersions-mixed-with-various-gums
#3
Chong-Yeon Kim, Byoungseung Yoo
Rheological properties of waxy barley flour (WBF) dispersions mixed with various gums (carboxyl methyl celluleose, guar gum, gum arabic, konjac gum, locust bean gum, tara gum, and xanthan gum) at different gum concentrations were examined in steady and dynamic shear. WBF-gum mixture samples showed a clear trend of shear-thinning behavior and had a non-Newtonian nature with yield stress. Rheological tests indicated that the flow and dynamic rheological parameter (apparent viscosity, consistency index, yield stress, storage modulus, and loss modulus) values of WBF dispersions mixed with gums, except for gum arabic, were significantly higher than those of WBF with no gum, and also increased with an increase in gum concentration...
March 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/28372153/synthesis-and-study-the-properties-of-stnps-gum-nanoparticles-for-salvianolic-acid-b-oral-delivery-system
#4
Xiaojing Li, Shengju Ge, Jie Yang, Ranran Chang, Caifeng Liang, Liu Xiong, Mei Zhao, Man Li, Qingjie Sun
To fabricate stable sized and shaped controlled release delivery systems for salvianolic acid B (Sal B), different food gums were individually added to short-chain glucan solution to prepare starch nanoparticles (StNPs)/gum nanocomposites by self-assembly, and Sal B was embedded in situ. The results showed that size of StNPs was reduced to ca. 45nm with the addition of chitosan and rosin, which decreased by over 50% than that of StNPs without the gum. The StNPs/guar gum nanocomposites had the largest size (109...
August 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28370113/structure-influence-on-mechanical-and-acoustic-properties-of-freeze-dried-gels-obtained-with-the-use-of-hydrocolloids
#5
Agnieszka Ciurzyńska, Agata Marzec, Arleta Mieszkowska, Andrzej Lenart
The influence of the structure formed by the type of hydrocolloids (low-methoxyl pectin, the mixture of xanthan gum, and locust bean gum, and mixture of xanthan gum, and guar gum) and the aeration time (3, 5, 7, and 9 min) on textural properties of freeze-dried gels were investigated. The hardest texture generating the strongest acoustic emission was obtained by freeze-dried pectin gel, characterised by the lowest porosity and the largest pore diameter. Aeration time significantly affected mechanical and acoustic properties of the pectin gel lyophilisate...
April 2017: Journal of Texture Studies
https://www.readbyqxmd.com/read/28363528/determination-of-carrageenan-by-means-of-photometric-titration-with-methylene-blue-and-toluidine-blue-dyes
#6
Dorota Ziółkowska, Agnieszka Kaniewska, Jan Lamkiewicz, Alexander Shyichuk
A new approach to carrageenan quantitation was described. The method consists in titration of carrageenan solution by Methylene Blue dye or Toluidine Blue dye solution until a certain absorbance value. The optimal wavelengths are 660nm and 640nm when titrating with Methylene Blue dye and Toluidine Blue dye, respectively. Rectilinear calibration plots (R(2)>0.996) provide carrageenan determination in the concentration range from 2 to 60mg/L with relative standard deviation from 1 to 5%. The proposed method is simple and feasible in use due to optical dip probe providing in situ absorbance measurements...
June 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28359894/characterisation-and-solution-properties-of-a-galactomannan-from-bauhinia-monandra-seeds
#7
Louis M Nwokocha, Chandra Senan, Peter A Williams, Madhav P Yadav
This study reports on the chemical and physicochemical properties of the polysaccharide isolated from Bauhinia monandra seeds. The seeds were found to contain 17.8% polysaccharide which consisted predominantly of galactose and mannose. The Man/Gal ratio was found to be approximately 4:1and the average molar mass was 2.54×10(5)g/mol. The extracted material was also found to contain a small amount of protein (5.35%). The galactomannan produced highly viscous solution; the viscosity-shear rate profile was best described by the Williamson model...
March 27, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28330208/purification-and-characterization-of-%C3%AE-mannanase-from-aspergillus-terreus-and-its-applicability-in-depolymerization-of-mannans-and-saccharification-of-lignocellulosic-biomass
#8
Hemant Soni, Hemant Kumar Rawat, Brett I Pletschke, Naveen Kango
Aspergillus terreus FBCC 1369 was grown in solid-state culture under statistically optimized conditions. β-Mannanase was purified to apparent homogeneity by ultrafiltration, anion exchange and gel filtration chromatography. A purification factor of 10.3-fold was achieved, with the purified enzyme exhibiting specific activity of 53 U/mg protein. The purified β-mannanase was optimally active at pH 7.0 and 70 °C and displayed stability over a broad pH range of 4.0-8.0 and a 30 min half-life at 80 °C. The molecular weight of β-mannanase was calculated as ~49 kDa by SDS-PAGE...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28284696/utilizing-whey-protein-isolate-and-polysaccharide-complexes-to-stabilize-aerated-dairy-gels
#9
Emily O'Chiu, Bongkosh Vardhanabhuti
Heated soluble complexes of whey protein isolate (WPI) with polysaccharides may be used to modify the properties of aerated dairy gels, which could be formulated into novel-textured high-protein desserts. The objective of this study was to determine the effect of polysaccharide charge density and concentration within a WPI-polysaccharide complex on the physical properties of aerated gels. Three polysaccharides having different degrees of charge density were chosen: low-methoxyl pectin, high-methoxyl type D pectin, and guar gum...
May 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28282944/the-influence-of-ph-on-the-scleroglucan-and-scleroglucan-borax-systems
#10
Claudia Mazzuca, Gianfranco Bocchinfuso, Antonio Palleschi, Paolo Conflitti, Mario Grassi, Chiara Di Meo, Franco Alhaique, Tommasina Coviello
The effects that an increase of environmental pH has on the triple helix of scleroglucan (Sclg) and on the Sclg/borax hydrogel are reported. Rheological experiments show that the hydrogel is less sensitive to pH increase than Sclg alone, while at pH = 14 a dramatic viscosity decrease takes place for both systems. This effect is evidenced also by the reduced water uptake and anisotropic elongation detected, at pH = 14, by the swelling behaviour of tablets prepared with the Sclg/borax system. On the opposite, a different behaviour was observed with guar gum and locust bean gum tablets, tested as reference polysaccharides...
March 9, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28273797/partially%C3%A2-hydrolyzed%C3%A2-guar%C3%A2-gum%C3%A2-increases%C3%A2-ferroportin%C3%A2-expression%C3%A2-in%C3%A2-the%C3%A2-colon%C3%A2-of%C3%A2-anemic%C3%A2-growing%C3%A2-rats
#11
Luciana Carvalho, Débora Brait, Márcia Vaz, Pablo Lollo, Priscila Morato, Silvia Oesterreich, Jorge Raposo, Karine Freitas
Studies have reported a positive effect of prebiotics on the bioavailability of iron. This study evaluated the effect of partially hydrolyzed guar gum (PHGG) on iron absorption mechanisms in anemic rats. Male Wistar rats were fed 75g American Institute of Nutrition Rodent Diets for growth, pregnancy and lactation (AIN93-G) without iron for three weeks in order to induce iron deficiency anemia. Then they were fed a control diet (n = 12; without fiber) or a diet with 7.5% of PHGG (n = 12), both without iron. Food intake, body growth and the feed efficiency coefficient (FEC) were measured...
March 3, 2017: Nutrients
https://www.readbyqxmd.com/read/28272993/release-behavior-and-bioefficacy-of-imazethapyr-formulations-based-on-biopolymeric-hydrogels
#12
Vikas Kumar, Anupama Singh, T K Das, Dhruba Jyoti Sarkar, Shashi Bala Singh, Rashmi Dhaka, Anil Kumar
Controlled release formulations of imazethapyr herbicide have been developed employing guar gum-g-cl-polyacrylate/bentonite clay hydrogel composite (GG-HG) and guar gum-g-cl-PNIPAm nano hydrogel (GG-NHG) as carriers, to assess the suitability of biopolymeric hydrogels as controlled herbicide release devices. The kinetics of imazethapyr release from the developed formulations was studied in water and it revealed that the developed formulations of imazethapyr behaved as slow release formulations as compared to commercial formulation...
March 8, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28262990/qualitative-profile-of-degummed-guar-cyamopsis-tetragonoloba-l-seeds-grown-in-a-mediterranean-area-for-use-as-animal-feed
#13
B Chiofalo, V Lo Presti, A D'Agata, R Rao, G Ceravolo, F Gresta
Guar (Cyamopsis tetragonoloba L.) is an interesting summer legume multipurpose crop used for the extraction of seed gum, due to its galactomannan content, and the high-protein by-product, (germ and hull) used for animal feed. The aim of this study was to assess qualitative traits of degummed seeds, named guar meal, of six guar varieties from India, South Africa and USA, grown in a Mediterranean environment (Sicily, Southern Italy), in order to explore their suitability for livestock, and comparing them with the marketed Indian products of guar meals, Churi and Korma...
March 6, 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/28260548/efficacy-of-fibre-additions-to-flatbread-flour-mixes-for-reducing-post-meal-glucose-and-insulin-responses-in-healthy-indian-subjects
#14
Hanny M Boers, Katrina MacAulay, Peter Murray, Rajendra Dobriyal, David J Mela, Maria A M Spreeuwenberg
The incidence of type 2 diabetes mellitus (T2DM) is increasing worldwide, including in developing countries, particularly in South Asia. Intakes of foods generating a high postprandial glucose (PPG) response have been positively associated with T2DM. As part of efforts to identify effective and feasible strategies to reduce the glycaemic impact of carbohydrate-rich staples, we previously found that addition of guar gum (GG) and chickpea flour (CPF) to wheat flour could significantly reduce the PPG response to flatbread products...
February 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28242951/gelation-and-thermal-characteristics-of-microwave-extracted-fish-gelatin-natural-gum-composite-gels
#15
P K Binsi, Natasha Nayak, P C Sarkar, C G Joshy, George Ninan, C N Ravishankar
In this study, the gelation and thermal characteristics of microwave extracted fish scale gelatin blended with natural gums such as gum arabic (AG), xanthan gum (XG), guar gum (GG), and tragacanth gum (TG) was evaluated. The nature of interaction and behavior of gelatin in presence of various gums was confirmed by particle size analysis, viscosity profile, FT-IR analysis and turbidity measurements. DSC data revealed that addition of AG, TG and GG remarkably improved the thermal stability of fish gelatin gel...
February 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28230790/influence-of-chitosan-swelling-behaviour-on-controlled-release-of-tenofovir-from-mucoadhesive-vaginal-systems-for-prevention-of-sexual-transmission-of-hiv
#16
Fernando Notario-Pérez, Araceli Martín-Illana, Raúl Cazorla-Luna, Roberto Ruiz-Caro, Luis-Miguel Bedoya, Aitana Tamayo, Juan Rubio, María-Dolores Veiga
The main challenges facing efforts to prevent the transmission of human immunodeficiency virus (HIV) are the lack of access to sexual education services and sexual violence against young women and girls. Vaginal formulations for the prevention of sexually transmitted infections are currently gaining importance in drug development. Vaginal mucoadhesive tablets can be developed by including natural polymers that have good binding capacity with mucosal tissues, such as chitosan or guar gum, semisynthetic polymers such as hydroxypropylmethyl cellulose, or synthetic polymers such as Eudragit(®) RS...
February 21, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28214586/mango-kernel-starch-gum-composite-films-physical-mechanical-and-barrier-properties
#17
Anjum Nawab, Feroz Alam, Muhammad Abdul Haq, Zubala Lutfi, Abid Hasnain
Composite films were developed by the casting method using mango kernel starch (MKS) and guar and xanthan gums. The concentration of both gums ranged from 0% to 30% (w/w of starch; db). Mechanical properties, oxygen permeability (OP), water vapor permeability (WVP), solubility in water and color parameters of composite films were evaluated. The crystallinity and homogeneity between the starch and gums were also evaluated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The scanning electron micrographs showed homogeneous matrix, with no signs of phase separation between the components...
May 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28192138/isolation-biochemical-characterization-and-antibiofilm-effect-of-a-lectin-from-the-marine-sponge-aplysina-lactuca
#18
Rômulo Farias Carneiro, Paulo Henrique Pinheiro de Lima, Renata Pinheiro Chaves, Rafael Pereira, Anna Luísa Pereira, Mayron Alves de Vasconcelos, Ulisses Pinheiro, Edson Holanda Teixeira, Celso Shiniti Nagano, Alexandre Holanda Sampaio
A new lectin was isolated from the marine sponge Aplysina lactuca (ALL) by combining ammonium sulfate precipitation and affinity chromatography on guar gum matrix. ALL showed affinity for the disaccharides α-lactose, β-lactose and lactulose (Ka=12.5, 31.9 and 145.5M(-1), respectively), as well as the glycoprotein porcine stomach mucin. Its hemagglutinating activity was stable in neutral acid pH values and temperatures below 60°C. ALL is a dimeric protein formed by two covalently linked polypeptide chains...
June 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28191980/interaction-mechanisms-between-air-bubble-and-molybdenite-surface-impact-of-solution-salinity-and-polymer-adsorption
#19
Lei Xie, Jingyi Wang, Duowei Yuan, Chen Shi, Xin Cui, Hao Zhang, Qi Liu, Qingxia Liu, Hongbo Zeng
The surface characteristics of molybdenite (MoS2) such as wettability and surface interactions have attracted much research interest in a wide range of engineering applications, such as froth flotation. In this work, a bubble probe atomic force microscope (AFM) technique was employed to directly measure the interaction forces between an air bubble and molybdenite mineral surface before/after polymer (i.e., guar gum) adsorption treatment. The AFM imaging showed that the polymer coverage on the surface of molybdenite could achieve ∼5...
February 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28139083/real-time-monitoring-of-trans-epithelial-electrical-resistance-in-cultured-intestinal-epithelial-cells-the-barrier-protection-of-water-soluble-dietary-fiber
#20
Atsushi Majima, Osamu Handa, Yuji Naito, Yosuke Suyama, Yuriko Onozawa, Yasuki Higashimura, Katsura Mizushima, Mayuko Morita, Yukiko Uehara, Hideki Horie, Takaya Iida, Akifumu Fukui, Osamu Dohi, Tetsuya Okayama, Naohisa Yoshida, Kazuhiro Kamada, Kazuhiro Katada, Kazuhiko Uchiyama, Takeshi Ishikawa, Tomohisa Takagi, Hideyuki Konishi, Zenta Yasukawa, Makoto Tokunaga, Tsutomu Okubo, Yoshito Itoh
AIM: Measuring trans-epithelial electrical resistance (TEER) in vitro is a method to evaluate barrier function. The first aim of this study is to verify a real-time TEER monitoring system in Caco-2 monolayer. The second aim is to investigate the therapeutic effect of partially hydrolyzed guar gum (PHGG), a dietary fiber, on interferon (IFN)-γ-induced intestinal barrier dysfunction using this monitoring system. METHODS: We measured TEER using real-time monitoring system and evaluated epithelial paracellular permeability using fluorescein isothiocyanate-conjugated dextran (4 kDa; FD4) in Caco-2 monolayers treated by IFN-γ for 48 h...
January 31, 2017: Journal of Digestive Diseases
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