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guar gum

Sonia Kundu, Aatrayee Das, Aalok Basu, Debjani Ghosh, Pallab Datta, Arup Mukherjee
Guar gum (GG) is a galactomannan obtained directly from the Cyamopsis tetragonoloba seeds pericarb. The biopolymer hydrates hugely in three chain associated coil formations. Chaotropic Hofmeister ion like lithium interacts at the hydrogen bonding sites and render GG homogenization in polar solvents like dimethyl sulfoxide. This phenomenon was used for the first time for galactomannan derivatisations in homogeneous phase. Higher degree of substitution (DS) that was hereto unattainable in GG was achieved due to Hofmeister ion assisted assembly deformations...
July 1, 2018: Carbohydrate Polymers
Pouyan Ebrahimi, Javier Vilcáez
To assess the risk of underground sources of drinking water contamination by barium (Ba) present in petroleum produced water disposed into deep saline aquifers, we examined the effect of salinity (NaCl), competition of cations (Ca, Mg), temperature (22 and 60°C), and organic fracturing additives (guar gum) on the sorption and transport of Ba in dolomites and sandstones. We found that at typical concentration levels of NaCl, Ca, and Mg in petroleum produced water, Ba sorption in both dolomites and sandstones is inhibited by the formation of Ba(Cl)+ complexes in solution and/or the competition of cations for binding sites of minerals...
April 12, 2018: Science of the Total Environment
Tran Van Hung, Takuya Suzuki
Background: Chronic kidney disease (CKD) is a worldwide health problem. Although the pathogenesis of CKD is still unclear, recent studies suggest that systemic inflammation caused by a dysregulated microflora and an impaired intestinal barrier is involved in CKD development. Objective: We investigated the effects of the fermentable dietary fibers (DFs), unmodified guar gum (GG), and partially hydrolyzed GG (PHGG) (i.e., substances with distinct viscosity characteristics) on CKD development, with a particular focus on colonic tight junction (TJ) barriers in mice...
April 1, 2018: Journal of Nutrition
Jia-Feng Chen, Jian Guo, Tao Zhang, Zhi-Li Wan, Juan Yang, Xiao-Quan Yang
Slowing the digestion of starch is one of the dominant concerns in food industry. A colloidal structural modification strategy for solving this problem was proposed in this work. Due to thermodynamic incompatibility between two biopolymers, water/water emulsion of waxy corn starch (WCS) droplets dispersed in a continuous aqueous guar gum (GG) was prepared. And zein particles (ZPs), obtained by anti-solvent precipitation and pectin modification, were used as stabilizer. As the ratio of zein to pectin in the particles was 1:1, their wetting properties in the two polysaccharides were similar, which made them accumulate at the interface and cover the WCS-rich droplets...
April 6, 2018: Journal of Agricultural and Food Chemistry
Surintorn Boonanuntanasarn, Khanittha Ditthab, Araya Jangprai, Chatsirin Nakharuthai
This study investigated the effects of dietary probiotic Saccharomyces cerevisiae in the striped catfish, Pangasianodon hypophthalmus, which is an important aquaculture species. Freeze-dried microencapsulated probiotic S. cerevisiae with guar gum was performed and used for fish feed supplementation. Striped catfish were fed for 120 days with one of three experimental diets: basal diet (control), basal diet supplemented with 106 -CFU S. cerevisiae g-1 diet (S. cerevisiae 106 ), and basal diet supplemented with 108 -CFU S...
March 27, 2018: Probiotics and Antimicrobial Proteins
S C Mojaki, S Bhardwaj Mishra, A K Mishra, J P Mofokeng
Mesoporous silica containing nanocomposites of in situ polymerised aniline grafted on guar gum (GG), were synthesised by sol-gel technique. Characterization of samples with respect to SEM, TEM, XRD, XPS, FTIR, BET, UV-vis, and PL illustrated the optically active materials with diverse morphologies. Microscopic analysis rendered transitional changes from smooth GG to coated PANI grafts and dense clusters of polysiloxane nanocomposites. FTIR analysis confirmed the interaction of GG-PANI-Si components. XRD diffractograms illustrate tremendous reduction of dominant amorphous phase of GG by grafted HCl doped PANI depicted by characteristic peaks (centred at 2θ = ~25° and 2θ = ~20...
March 23, 2018: International Journal of Biological Macromolecules
Gaurav Sharma, Amit Kumar, Kunjana Devi, Shweta Sharma, Mu Naushad, Ayman A Ghfar, Tansir Ahamad, Florian J Stadler
Rapid increase in use of fungicides for the agricultural and industrial purposes has marked the deterioration of water resources which ultimately affects the human life. Accordingly, various attempts have been made in the removal of these noxious compounds. In the same context, we are presenting biopolymers based nanohydrogel sheets; guar gum-crosslinked-Soya lecithin nanohydrogel sheets (GG-crosslinked-SY NHS) used for the effective removal of a fungicide; thiophanate methyl from aqueous solution. Guar gum and soya lecithin were employed as the biopolymers in the fabrication of nanohydrogel sheets due to their non- toxic nature, easy availability, cheapness and significant properties...
March 20, 2018: International Journal of Biological Macromolecules
Wonjun Jo, June Ha Bak, Byoungseung Yoo
The steady and dynamic shear rheological properties of binary gum mixtures with xanthan gum (XG) and galactomannans (guar gum (GG) and locust bean gum (LBG)) were examined in a concentrated solution (1% w/w) as a function of gum mixing ratio (100/0, 75/25, 50/50, and 0/100). All samples, except for individual GG and LBG, showed high shear-thinning behavior with yield stress. The values of flow (K, ηa,50 , and σoc ) and dynamic rheological parameters (G' and G″) of XG-GG and XG-LBG mixtures were significantly higher compared to XG alone, indicating that the flow and viscoelastic properties of binary gum mixtures were greatly affected by the addition of GG and LBG...
March 20, 2018: International Journal of Biological Macromolecules
Peddi Maharshi, Sachin Kumar Singh, Monica Gulati, Ankit Kumar Yadav, Varun Garg, Bimlesh Kumari, K Gowthamarajan
A major challenge in targeting orally administered drugs to colon is their passage through the long gastrointestinal path comprising highly variant conditions in terms of pH, viscosity, gut motility and microbial flora. Approaches of pH controlled release and microbially triggered release have proved to be successful in achieving colon targeting only to a partial extent. In an attempt to improve targeting, both these approaches have been combined together with the approach of liquisolid technology which, hitherto, remains unexplored for colon targeting...
March 19, 2018: Current Drug Delivery
Ankita Sharma, Navneet Kaur, Saurabh Sharma, Amit Sharma, M S Rathore, Kumar Ajay, Neeraj Mishra
The aim of the present study is to develop embelin loaded guar gum microparticles through emulsification technique. The in vitro release of the optimized formulation was found to be 88.5±3.8% in 24 hr, have exhibit remarkably sustain and delayed the release of embelin at a specific site. Embelin loaded microparticles showed average particle size of 12.9± 0.75 µm. The statistical analysis was carried out by one way anova followed by comparison test of Bonferroni. P values<0.05 were considered as significant...
March 15, 2018: Journal of Microencapsulation
Pouyan Ebrahimi, Javier Vilcáez
This research aimed to elucidate the effect of brine salinity and guar gum on the sorption and transport of Ba in dolomite rocks collected from the Arbuckle formation in Oklahoma, USA. Guar gum represents the most important organic additive used in viscosified fracturing fluids, and Ba constitutes the most common and abundant heavy metal found in unconventional oil and gas (UOG) wastewater. Batch experiments conducted using powdered dolomite rocks (500-600 μm particle size) revealed that at brine salinities of UOG wastewater, chloro-complexation reactions between Ba and Cl ions and pH changes that results from dolomite dissolution are the controlling factors of Ba sorption on dolomite...
March 12, 2018: Journal of Environmental Management
Marcin Andrzej Kurek, Sabina Karp, Adrian Stelmasiak, Ewelina Pieczykolan, Karolina Juszczyk, Anne Rieder
In this study, β-glucan was extracted from wholegrain oat and barley flours by a novel extraction and purification method employing natural flocculants (chitosan, guar gum and gelatin). The use of flocculants decreased the total amount of extracted gum, which was highest in control samples (9.07 and 7.9% for oat and barley, respectively). The β-glucan specific yield, however, increased with the use of chitosan and guar gum, which were able to remove protein and ash impurities resulting in gums with a higher purity...
May 15, 2018: Carbohydrate Polymers
Nimisha Joshi, Feixue Liu, Mathew Paul Watts, Heather Williams, Victoria S Coker, Doris Schmid, Thilo Hofmann, Jonathan R Lloyd
Engineered nanoparticles offer the potential for remediation of land and water that has been contaminated by organics and metals. Microbially synthesized nano-scale magnetite, prepared from Fe(III) oxides by subsurface Fe(III)-reducing bacteria, offers a scalable biosynthesis route to such a nano-scale remediation reagent. To underpin delivery of "bionanomagnetite" (BNM) nanomaterial during in situ treatment options, we conducted a range of batch and column experiments to assess and optimise the transport and reactivity of the particles in porous media...
March 9, 2018: Scientific Reports
Chiara Berlangieri, Giovanna Poggi, Sergio Murgia, Maura Monduzzi, Luigi Dei, Emiliano Carretti
A dynamic, rheological, and structural characterization of aqueous gel-like systems containing hydroxypropyl guar gum (HPG), borax and glycerol is presented in this paper. The role of glycerol, which is introduced as a plasticizer in the formulation, is investigated by means of11 B NMR and1 H NMR PGSTE measurements in order to clarify its contribution to the gel network formation and its interaction with borax, with whom it forms a complex. The effect of gels components on the rheological behaviour and on the activation energy related to the relaxation process of the system was assessed by means of rheology...
February 13, 2018: Colloids and Surfaces. B, Biointerfaces
Majid Hussain, Tahir Zahoor, Saeed Akhtar, Amir Ismail, Aneela Hameed
The purpose of current study was to purify and partially depolymerize guar gum by β-mannanase, HCl, Ba(OH)2 actions and subjected to inspect compositional, thermogravimetric analysis (TGA) and haemolytic activity. Chemical composition revealed mannose and galactose ratio remained un-altered even after process of purification and hydrolysis. TGA thermograms affirmed initial and final decomposition temperature in various zones. Major decomposition stages apparently revealed partially hydrolyzed guar gum (PHGG) exhibited better heat stable properties having more zones of degradation than crude one...
March 2018: Journal of Food Science and Technology
Ayeza Naeem, Tanveer Abbas, Tahira Mohsin Ali, Abid Hasnain
This study investigated the effect of treatment of guar gum coating coupled with essential oils. Harvested UGM were preserved using edible coatings containing essential oils (Nigella sativa, Coriandrum sativum, Foeniculum vulgare and Laurus nobilis) derived using two different solvents (methanol and ethanol) and stored at refrigeration temperature (10 °C, 80-85% RH). Physiological and biochemical parameters that assess the quality of fruits were determined. Microbiological analysis was also performed at the start and end of shelf life...
February 21, 2018: International Journal of Biological Macromolecules
Adam C Mumford, Denise M Akob, J Grace Klinges, Isabelle M Cozzarelli
The development of unconventional oil and gas (UOG) resources results in production of large volumes of wastewater containing a complex mixture of hydraulic fracturing chemical additives and components from the formation. Release of these wastewaters into the environment poses potential risks that are poorly understood. Microbial communities in stream sediments form the base of the food chain, and may serve as sentinels for changes in stream health. Iron reducing organisms have been shown to play a role in the biodegradation of a wide range of organic compounds, and to evaluate their response to UOG wastewater, we enriched anaerobic microbial communities from sediments collected upstream (background) and downstream (impacted) of an UOG wastewater injection disposal facility in the presence of hydraulic fracturing fluid (HFF) additives: guar gum, ethylene glycol, and two biocides, DBNPA and Bronopol...
February 16, 2018: Applied and Environmental Microbiology
Zhenchao Zhang
Hydroxypropyl guar gum is considered to be a main component of oilfield fracturing wastewater (OFW). This work is intended to optimize the experimental conditions for the maximum oxidative degradation of hydroxypropyl guar gum by the coagulation and UV/H2O2/ferrioxalate complexes process. Optimal reaction conditions were proposed based on the chemical oxygen demand (COD) removal efficiency and UV_vis spectra analysis. The overall removal efficiency of COD reached 83.8% for a dilution ratio of raw wastewater of 1:2, pH of 4 and FeCl3 loading of 1,000 mg/L in the coagulation process; the dosage of H2O2 (30%,v/v) was 0...
February 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Nandkishore Thombare, Sumit Mishra, M Z Siddiqui, Usha Jha, Deodhari Singh, Gopal R Mahajan
The novel hydrogels were synthesized by grafting guar gum with acrylic acid and cross-linking with ethylene glycol di methacrylic acid (EGDMA). The synthesis of hydrogel was confirmed by characterization through 13C NMR, FTIR spectroscopy, SEM micrography, thermo-gravimetric analysis and water absorption studies under different solutions. Synthesized hydrogel (GG-AA-EGDMA) was confirmed to be biodegradable with half-life period of 77 days through soil burial biodegradation studies. The effects of hydrogel treatment on soil were evaluated by studying various physico-chemical properties of soil like bulk density, porosity, water absorption and retention capacity etc...
April 1, 2018: Carbohydrate Polymers
Deepak Mudgil, Sheweta Barak, Ami Patel, Nihir Shah
Guar galactomannan was enzymatically hydrolyzed to obtain partially hydrolyzed guar gum which can be utilized as prebiotic source. In present study, growth of probiotics (Lactic Acid Bacteria strains) were studied with glucose, partially hydrolyzed guar gum and native guar gum. All the six strains were galactose &/or mannose positive using the API CHl 50 test. Almost all these strains showed an ability to assimilate partially hydrolyzed guar gum with respect to increase in optical density and viable cell count with concomitant decrease in the pH of the growth medium...
February 1, 2018: International Journal of Biological Macromolecules
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