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https://www.readbyqxmd.com/read/28105485/biochemical-characterization-of-thermostable-%C3%AE-1-4-mannanase-belonging-to-the-glycoside-hydrolase-family-134-from-aspergillus-oryzae
#1
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
https://www.readbyqxmd.com/read/28102068/robust-guar-gum-cellulose-nanofibrils-multilayer-films-with-good-barrier-properties
#2
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...
January 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28093331/synthesis-of-2-alkenyl-3-butoxypropyl-guar-gum-with-enhanced-rheological-properties
#3
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...
January 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28078260/rheological-and-pasting-properties-of-naked-barley-flour-as-modified-by-guar-xanthan-and-locust-bean-gums
#4
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
https://www.readbyqxmd.com/read/28067641/kinetic-degradation-of-guar-gum-in-oilfield-wastewater-by-photo-fenton-process
#5
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
https://www.readbyqxmd.com/read/28024542/guar-gum-oleate-graft-poly-methacrylic-acid-hydrogel-as-a-colon-specific-controlled-drug-delivery-carrier
#6
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
https://www.readbyqxmd.com/read/28008227/transbuccal-delivery-of-betahistine-dihydrochloride-from-mucoadhesive-tablets-with-a-unidirectional-drug-flow-in-vitro-ex-vivo-and-in-vivo-evaluation
#7
Mohamed A El-Nabarawi, Adel A Ali, Heba M Aboud, Amira H Hassan, Amany H Godah
OBJECTIVE: Betahistine dihydrochloride (BH.2HCl), an anti-vertigo histamine analog used in the treatment of Ménière's disease, undergoes extensive first-pass metabolism and suffers from short biological half-life. The aim of the present work was to develop and estimate controlled release mucoadhesive buccal tablets of BH.2HCl with a unidirectional drug flow to overcome this encumbrance. METHODS: A direct compression method was adopted for preparation of the tablets using mucoadhesive polymers like guar gum, hydroxypropyl methyl cellulose K4M, sodium carboxymethyl cellulose and their combinations...
2016: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/27987974/deciphering-the-potential-of-guar-gum-ag-cu-nanocomposite-films-as-an-active-food-packaging-material
#8
Yasir Ali Arfat, Mohammed Ejaz, Harsha Jacob, Jasim Ahmed
Guar gum (GG) based nanocomposite (NC) films were prepared by incorporating silver-copper alloy nanoparticles (Ag-Cu NPs) through solution casting method. Effect of NP loadings (0.5-2%) on the thermo-mechanical, optical, spectral, oxygen barrier and antimicrobial properties of the GG/Ag-Cu NC films were investigated. Tensile testing showed an improvement in the mechanical strength, and a decrease in elongation at break for all NP loadings. NP incorporation into GG films showed a marked influence on the color values...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27987966/guar-gum-as-biosourced-building-block-to-generate-highly-conductive-and-elastic-ionogels-with-poly-ionic-liquid-and-ionic-liquid
#9
Biao Zhang, Guillaume Sudre, Guilhem Quintard, Anatoli Serghei, Laurent David, Julien Bernard, Etienne Fleury, Aurélia Charlot
In this study, we report on the simple and straightforward preparation of ionogels arising from the addition of guar gum (a plant-based polysaccharide) in a solution of precisely-defined poly(ionic liquid) chains (PIL) in imidazolium-based ionic liquid (IL). The development of intermolecular polar interactions (mainly hydrogen bonds) and topologic chain entanglements induces the formation of physical biohybrid ionogels, whose elastic properties can be easily tuned by varying the composition (up to 30000Pa)...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27986630/molecular-mechanism-of-lysozyme-adsorption-onto-chemically-modified-alginate-guar-gum-matrix
#10
Ma Emilia Brassesco, Nadia Woitovich Valetti, Guillermo Picó
The equilibrium isotherms and adsorption kinetics of lysozyme (LZ) on epichlorohydrin (Epi) cross-linked alginate-guar gum (Alg-GG) matrix were studied. Adsorption kinetics followed a pseudo-first-order model while the equilibrium isotherm could be represented by the Freundlich equation. The maximal amount of LZ adsorbed onto this matrix was around 2.4mg per g of hydrated matrix at pH 7.00. The adsorption mechanism was associated to a simple diffusion process with a weak columbic interaction between LZ and the matrix...
December 13, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27956333/anionically-functionalized-guar-gum-embedded-with-silica-nanoparticles-an-efficient-nanocomposite-adsorbent-for-rapid-adsorptive-removal-of-toxic-cationic-dyes-and-metal-ions
#11
Abhay Shankar Patra, Soumitra Ghorai, Debabrata Sarkar, Raghunath Das, Supriya Sarkar, Sagar Pal
In the present work, a novel biodegradable nanocomposite has been developed (h-GG/SiO2) based on anionically modified guar gum and in-situ deposited SiO2 NPs through sol-gel technique. Here the anionically modified guar gum stimulates the silica polymerization process and hence acts as a unique template for the development of spherical SiO2 NPs. Batch adsorption studies indicate that h-GG/SiO2 nanocomposite shows remarkable adsorption capacity for cationic dyes/metal ions (Qmax: 781.25mgg(-1)for malachite green (MG), 281...
February 2017: Bioresource Technology
https://www.readbyqxmd.com/read/27876597/role-of-synbiotics-in-polysaccharide-assisted-colon-targeted-microspheres-of-mesalamine-for-the-treatment-of-ulcerative-colitis
#12
Rupinderjeet Kaur, Monica Gulati, Sachin Kumar Singh
The present study explains the effect of concomitant administration of synbiotics with the polysaccharide based colon targeted delivery system. As the gut microflora get deranged on administration of mesalamine, drug release from such delivery systems is expected to be jeopardised because the release trigger is dependent solely on the colonic microbiota. To overcome this limitation, mesalamine was formulated as microspheres with guar gum and xanthan gum (prebiotics). These were combined with probiotics containing Lactobacillus acidophilus, L...
February 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27863994/understanding-the-physics-of-functional-fibers-in-the-gastrointestinal-tract-an-evidence-based-approach-to-resolving-enduring-misconceptions-about-insoluble-and-soluble-fiber
#13
Johnson W McRorie, Nicola M McKeown
Enduring misconceptions about the physical effects of fiber in the gut have led to misunderstandings about the health benefits attributable to insoluble and soluble fiber. This review will focus on isolated functional fibers (eg, fiber supplements) whose effects on clinical outcomes have been readily assessed in well-controlled clinical studies. This review will also focus on three health benefits (cholesterol lowering, improved glycemic control, and normalizing stool form [constipation and diarrhea]) for which reproducible evidence of clinical efficacy has been published...
November 15, 2016: Journal of the Academy of Nutrition and Dietetics
https://www.readbyqxmd.com/read/27847225/mesoporous-silica-nanoparticle-based-enzyme-responsive-system-for-colon-specific-drug-delivery-through-guar-gum-capping
#14
Balmiki Kumar, Senthilguru Kulanthaivel, Animesh Mondal, Smruti Mishra, Biplab Banerjee, Asim Bhaumik, Indranil Banerjee, Supratim Giri
In the global context of increasing colonic diseases, colon specific oral drug delivery systems have shown promise as an effective therapeutic modality. Herein, we developed a mesoporous silica nanoparticle (MSN) based enzyme responsive materials for colon specific drug delivery. We have utilized guar gum, a natural carbohydrate polymer as a capping layer to contain a model drug, such as 5-flurouracil (5FU) within the mesoporous channels of MSN. Analytical characterization including electron microscopy, PXRD, nitrogen sorption, thermogravimetric analysis and FTIR, confirmed that the synthesized MSN with size less than 100nm is of MCM-41type...
October 29, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27842845/qbd-based-synthesis-and-characterization-of-polyacrylamide-grafted-corn-fibre-gum
#15
Akashdeep Singh, Bhumika Mangla, Sheshank Sethi, Sunil Kamboj, Radhika Sharma, Vikas Rana
The aim of present investigation was to utilize quality by design approach for the synthesis of polyacrylamide corn fibre gum (PAAm-g-CFG) from corn fibre gum (CFG) by varying concentration of acrylamide and initiator. The spectral analysis (ATR-FTIR, (1)H NMR, DSC, X-ray and Mass spectroscopy) was conducted to assure grafting copolymerization of CFG with acrylamide. The powder flow properties confirm the porous nature of PAAm-g-CFG. The grafted copolymer dispersion showed shear thinning behaviour that follows Herschel Bulkley model...
January 20, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27842806/synthesis-of-dual-responsive-carbohydrate-polymer-based-ipn-microbeads-for-controlled-release-of-anti-hiv-drug
#16
S Eswaramma, K S V Krishna Rao
The present study aims at preparation of dual responsive interpenetrating polymer network hydrogel microbeads from sodium alginate and functionally modified guar gum. Guar gum was modified by graft copolymerization using N-vinylcaprolactam, the maximum % grafting 123.2, obtained at different optimized conditions. The graft copolymer was blended with sodium alginate to form hydrogel microbeads by emulsion crosslinking method using glutaraldehyde as crosslinker. Zidovudine, an anti-HIV drug was encapsulated with 68% encapsulation efficiency...
January 20, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27819518/x-ray-induced-mutation-of-bacillus-sp-mr10-for-manno-oligosaccharides-production-from-copra-meal
#17
Siriporn Chaikaew, Apinun Kanpiengjai, Jenjira Intatep, Kridsada Unban, Pairote Wongputtisin, Goro Takata, Chartchai Khanongnuch
The present study demonstrates the effectiveness of X-ray radiation in strain improvement for defective lipase production by Bacillus sp. MR10 for further application in the fermentative production of manno-oligosaccharides (MOS) from agricultural by-product, defatted copra meal (DCM). The mutants obtained were screened based on their defective lipase activity together with their β-mannanase production performance. Among 10 selected mutants, the strain M7 was the highest promising mutant regarding the smallest lipase activity (0...
November 7, 2016: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/27819289/silver-nanoparticles-containing-dual-function-hydrogels-based-on-a-guar-gum-sodium-borohydride-system
#18
Lei Dai, Ben Nadeau, Xingye An, Dong Cheng, Zhu Long, Yonghao Ni
Dual-function hydrogels, possessing both stimuli-responsive and self-healing properties, have recently attracted attention of both chemists and materials scientists. Here we report a new paradigm using natural polymer (guar gum, GG) and sodium borohydride (NaBH4), for the preparation of silver nanoparticles (AgNPs)-containing smart hydrogels in a simple, fast and economical way. NaBH4 performs as a reducing agent for AgNPs synthesis using silver nitrate (AgNO3) as the precursor. Meanwhile, sodium metaborate (NaBO2) (from NaBH4) behaves as a cross-linking agent between GG molecular chains...
November 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27818862/kinetic-study-of-a-%C3%AE-mannanase-from-the-bacillus-licheniformis-hdym-04-and-its-decolorization-ability-of-twenty-two-structurally-different-dyes
#19
Jingping Ge, Renpeng Du, Dan Zhao, Gang Song, Man Jin, Wenxiang Ping
BACKGROUND: The microbial β-mannanases have been increasingly exploited for bioconversion of biomass materials and various potential industrial applications, such as bleaching of softwood pulps, scouring and desizing, food and feed additive, and oil and textile industries. In this paper, a β-mannanase was characterization from the bacteria, Bacillus licheniformis HDYM-04, which was a high β-mannanase-producing strain (576.16 ± 2.12 U/mL at 48 h during fermentation). METHODS: The michaelis constant (Km ) and maximum velocity (Vmax ) of β-mannanase were determined...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27790653/guar-gum-as-a-novel-binder-for-sulfur-composite-cathodes-in-rechargeable-lithium-batteries
#20
Qinyu Li, Huijun Yang, Lisheng Xie, Jun Yang, Yanna Nuli, Jiulin Wang
Due to their high theoretical energy densities, lithium sulfur (Li-S) batteries are currently some of the most extensively investigated electrochemical power sources. As a sustainable and environmentally friendly biopolymer, guar gum (GG) is chosen as a binder for use in Li-S batteries for the first time. The results show that GG is a promising binder for sulfur composite cathode materials, and exhibits excellent cycling performance and a favorable high rate capability.
October 28, 2016: Chemical Communications: Chem Comm
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