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guar gum

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...
March 8, 2017: Journal of Dairy Science
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
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
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
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
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...
March 6, 2017: British Journal of Nutrition
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
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
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...
February 16, 2017: International Journal of Biological Macromolecules
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...
February 10, 2017: International Journal of Biological Macromolecules
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
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
Nitesh Dhiman, Markandeya, Amrita Singh, Neeraj K Verma, Nidhi Ajaria, Satyakam Patnaik
ZnO NPs were synthesized by a prudent green chemistry approach in presence of polyacrylamide grafted guar gum polymer (pAAm-g-GG) to ensure uniform morphology, and functionality and appraised for their ability to degrade photocatalytically Acridine Orange (AO) dye. These ZnO@pAAm-g-GG NPs were thoroughly characterized by various spectroscopic, XRD and electron microscopic techniques. The relative quantity of ZnO NPs in polymeric matrix has been estimated by spectro-analytical procedure; AAS and TGA analysis...
January 13, 2017: Journal of Colloid and Interface Science
Rakkhumkaew Numfon
Gluten-free bread formulations based on small broken rice berry using various types of hydrocolloids (xanthan gum, guar gum, and locust bean gum) at different concentrations (0, 1, 1.5, and 2 g/100 g) were tested in this study. The effects of hydrocolloid addition on the pasting properties of flour were also investigated, including the quality parameters of the breads. The pasting properties of small broken rice berry flour incorporated with guar gum were most affected. Gluten-free bread containing hydrocolloid showed improved qualities in terms of loaf specific volume, texture, sensory values, and microstructure...
January 1, 2017: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
Kiyota Sakai, Mai Mochizuki, Miyuki Yamada, Yuta Shinzawa, Miho Minezawa, Saran Kimoto, Shunsuke Murata, Yuhei Kaneko, Saaya Ishihara, Sadanari Jindou, Tetsuo Kobayashi, Masashi Kato, Motoyuki Shimizu
A β-1,4-mannanase, termed AoMan134A, that belongs to the GH 134 family was identified in the filamentous fungus Aspergillus oryzae. Recombinant AoMan134A was expressed in Pichia pastoris, and the purified enzyme produced mannobiose, mannotriose, mannotetraose, and mannopentaose from galactose-free β-mannan, with mannotriose being the predominant reaction product. The catalytic efficiency (k cat/K m ) of AoMan134A was 6.8-fold higher toward galactomannan from locust bean gum, than toward galactomannan from guar gum, but similar toward galactomannan from locust bean gum and glucomannan from konjac flour...
January 19, 2017: Applied Microbiology and Biotechnology
Lei Dai, Zhu Long, Jie Chen, Xingye An, Dong Cheng, Avik Khan, Yonghao Ni
The pursuit of sustainable functional materials requires development of materials based on renewable resources and efficient fabrication methods. Hereby, we fabricated all-polysaccharides multilayer films using cationic guar gum (CGG) and anionic cellulose nanofibrils (i.e., TEMPO-oxidized cellulose nanofibrils, TOCNs) through a layer-by-layer casting method. This technique is based on alternate depositions of oppositely charged water-based CGG and TOCNs onto laminated films. The resultant polyelectrolyte multilayer films were transparent, ductile, and strong...
February 2, 2017: ACS Applied Materials & Interfaces
Fengsan Zhang, Yiding Shen, Ting Ren, Lei Wang, Ying Su
A new guar gum derivative was synthesized though the nucleophilic substitution of sodium hydroxide-activated guar gum with n-butyl glycidyl (BGE) ether. The physicochemical properties of 2-alkenyl-3-butoxypropyl guar gum (ABPG) were characterized by attenuated total reflection Fourier transform infrared spectrometry (ATR-FTIR), X-ray diffraction (XRD) and thermal gravimetric analyses (TGA). The results showed that sodium hydroxide can be effectively substituted with BGE to form the ABPG. The steady and dynamic rheological properties of the aqueous solution and ABPG gel were determined using an RS6000 rheometer...
April 2017: International Journal of Biological Macromolecules
Sung-Jin Yoon, Youngseung Lee, Byoungseung Yoo
To understand the effects of adding different gums (guar, xanthan, and locust bean gums) on naked barley flour (NBF), the rheological and pasting properties of NBF-gum mixtures were measured at different gum concentrations (0, 0.3, and 0.6% w/w). Steady shear rheological properties were determined by rheological parameters for power law and Casson models. All samples showed a clear trend of shear-thinning behavior (n=0.16~0.48) and had a non-Newtonian nature with yield stress. Consistency index, apparent viscosity, and yield stress values increased with an increase in gum concentration...
December 2016: Preventive Nutrition and Food Science
Shunwu Wang, Ziwang Li, Qinglong Yu
Guar gum is considered as a main component of oilfield wastewater. This work is intended to optimize the experimental conditions (H2O2 dosage, Fe(2+) dosage, initial concentration of organics, initial pH and temperature) for the maximum oxidative degradation of guar gum by Fenton's reagent. The kinetics of guar gum removal were evaluated by means of the chemical oxygen demand (COD) and the absorbance measurements. The batch experiment results showed that the optimum conditions were: H2O2 dosage, 10,000 mg/L; Fe(2+)dosage, 2,000 mg/L; initial concentration of organics, 413 mg/L; pH, 3 and temperature, 35 °C, under which the COD removal could reach 61...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
D Sathya Seeli, M Prabaharan
A novel type of ethylene glycol dimethacrylate (EGDMA) cross-linked guar gum oleate-graft-poly(methacrylic acid) (GGO-g-PMAc) hydrogel was prepared as a pH-responsive controlled release carrier for colon-specific drug delivery. The structure of GGO-g-PMAc hydrogel was characterized by FT-IR, (1)H NMR and X-ray diffraction (XRD) analysis. The swelling degree of the GGO-g-PMAc hydrogel at pH 7.4 was found to be higher than that at pH 1.2. The drug release studies performed in pH 7.4 and 1.2 buffer solutions at 37°C revealed that the rate and amount of drug released from the GGO-g-PMAc hydrogel at pH 7...
February 20, 2017: Carbohydrate Polymers
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