Topic
Guar gum
About: Guar gum is a research topic. Over the lifetime, 5611 publications have been published within this topic receiving 105940 citations.
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TL;DR: In this paper, a composite material of acrylic acid as the polymerization monomer grafted sodium lignosulfonate and guar gum was prepared, which provided a channel for adsorbing metal ions with its abundant active functional groups and porous structure.
42 citations
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TL;DR: The results suggest that the gel network of SMGHs was primarily maintained by hydrophobic, electrostatic interactions and hydrogen bonds.
42 citations
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19 Dec 1977
TL;DR: A clay-free well-bore fluid having unstructured viscosity and improved water loss properties from an additive composition present in an amount of 0.1 to 3 weight % is presented in this article.
Abstract: A clay-free, i.e., non-argillaceous brine wellbore fluid having unstructured viscosity and improved water loss properties from an additive composition present in an amount of 0.1 to 3 weight % based on wellbore fluid and consisting essentially of 15 to 95 weight % of guar gum or hydroxyalkyl guar gum and 5 to 85 weight % of a water soluble salt, preferably alkaline earth salt of lignosulfonate.
42 citations
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TL;DR: In this article, a superabsorbent nanocomposite was synthesized by grafted copolymerization among natural guar gum (GG), partially neutralized acrylic acid (NaA) and Na-montmorillonite (MMT) in the aqueous solution using ammonium persulfate as initiator and N,N 0 -methylenebisacrylamide (MBA) as crosslinker.
Abstract: Novel guar gum-g-poly(sodium acrylate)/Na-montmorillonite (GG-g-PNaA/MMT) superabsorbent nanocomposites were synthesized by grafted copolymerization among natural guar gum (GG), partially neutralized acrylic acid (NaA) and Na-montmorillonite (MMT) in the aqueous solution using ammonium persulfate as initiator and N,N 0 -methylenebisacrylamide (MBA) as crosslinker. Fourier transform infrared spectroscopy confirmed that NaA had been grafted onto GG and the OH groups of MMT participated in the reaction. X-ray diffraction and scanning electron microscopy analyses revealed that MMT was exfoliated and equably dispersed in GG-g-PNaA matrix. The effects of MMT and MBA on water absorbency were investigated. The results show that introducing MMT into the GG-g-PNaA network improved the swelling capability and the swell- ing rate of the superabsorbent nanocomposite. The nanocomposites keep water absor- bency high, within a wide pH range from 4 to 11 and exhibit better reswelling capability.
42 citations
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TL;DR: It was confirmed to be a true endo-acting β-1,4-mannanase, which showed requirement of four mannose residues for hydrolysis, and was also capable of catalyzing transglycosylation reactions, which make RmMan5A highly useful in the food/feed, paper and pulp, and detergent industries.
Abstract: An endo-1,4-β-mannanase gene (RmMan5A) was cloned from the thermophilic fungus Rhizomucor miehei for the first time and expressed in Escherichia coli The gene had an open reading frame of 1330 bp encoding 378 amino acids and contained four introns It displayed the highest amino acid sequence identity (42%) with the endo-1,4-β-mannanases from glycoside hydrolase family 5 The purified enzyme was a monomer of 43 kDa RmMan5A displayed maximum activity at 55 °C and an optimal pH of 70 It was thermostable up to 55 °C and alkali-tolerant, displaying excellent stability over a broad pH range of 40–100, when incubated for 30 min without substrate The enzyme displayed the highest specificity for locust bean gum (Km = 378 mg mL–1), followed by guar gum (Km = 775 mg mL–1) and konjac powder (Km = 227 mg mL–1) RmMan5A hydrolyzed locust bean gum and konjac powder yielding mannobiose, mannotriose, and a mixture of various mannose-linked oligosaccharides It was confirmed to be a true endo-acting β-1,4-mannan
42 citations