Showing papers on "Guar gum published in 2019"
TL;DR: In this paper, zero valent iron (ZVI) was used for photochemical exclusion of methyl violet from aqueous solution, which was synthesized via ultrasonication method.
155 citations
TL;DR: This review article provides a comprehensive overview of different modifications made on guar gum through derivatization in the quest to make them more versatile for drug delivery applications.
115 citations
TL;DR: In this paper, the viability of two types of biopolymer, xanthan gum and guar gum, as environmentally friendly additives for collapsible soil stabilization was explored, and the results revealed that biopolymers decrease maximum dry density and permeability of the collapsed soil.
Abstract: Addition of appropriate additives is considered as one of the most widely used techniques in soil stabilization applications. This study explores the viability of two types of biopolymer, xanthan gum and guar gum, as environmentally friendly additives for collapsible soil stabilization. Compaction, consolidation, permeability, and unconsolidated-undrained triaxial tests were performed in this study to measure the engineering properties of treated soil with different percentages of biopolymer at various curing times. Additionally, scanning electron microscopy (SEM) test was employed to assess the changes on the morphological characteristics of the stabilized soil. The results reveal that biopolymers decrease maximum dry density and permeability of the collapsible soil. The findings also indicate that strain–stress curves are influenced by the amount of biopolymer and curing time. Also, the results of SEM test show the changes in soil morphological characteristics due to the interaction between the biopolymers strings and fine-grained particles of the soil. Generally, the results suggest that xanthan gum and guar gum stabilization play a major role in fine-grained collapsible soil mechanical properties improvement, resulting in an eco-friendly and sustainable substitute to traditional soil additives.
90 citations
TL;DR: The main conclusion is that the micro-encapsulation is an effective method to maintain the stability of sensitive compounds such as anthocyanins, but also ascorbic acid.
90 citations
TL;DR: Guar gum and cationic guar gum (CGG) were used to improve lipid bilayer membrane stability and reduce degradation of encapsulated curcumin in this article, and the results indicated that CGG deposited onto the surface of liposomes could stabilize the lipid bilayers better than GG.
83 citations
TL;DR: In this paper, a quasi-solid-state ZIB with guar gum bio-polymer electrolyte was constructed, which is the first work that demonstrates high performance and long cycling life of a flexible ZIB using solid-state electrolyte, and achieves the best cycling performance ever reported for ZIBs.
77 citations
TL;DR: In this paper, the effect of chitosan (CH) along with guar gum (GG) (5, 15, and 25%) on the quality of shiitake mushroom (Lentinus edodes) stored at 4'±'1'°C for 16'days was investigated.
74 citations
TL;DR: Overall, polysaccharide based hydrocolloids with linear chain and higher viscosity have a remarkable effect on the enhancing gluten network.
71 citations
TL;DR: In this paper, a biphasic edible film based on sago starch (SS) and guar gum (GG) was developed, and thereafter, two essential oils (EOs) were impregnated either individually or in combination into the blend.
68 citations
TL;DR: In this article, the authors evaluated three different combinations of guar gum and polyvinyl pyrrolidone-carboxymethyl cellulose (PVP-CMC) hydrogel film as an alternative food packaging material.
64 citations
TL;DR: The effect of guar gum (GG) on the physicochemical properties and digestibility of lotus seed starch subjected to autoclaving-cooling were investigated and changes in crystal structure and viscosity partially explained the reduced digestibility.
TL;DR: In this paper, food-grade whey protein isolate (WPI) nanofibers were fabricated in combination with guar gum (GG) using the electrospinning method for the first time.
TL;DR: This work fabricates the self-healing guar gum-based supramolecular hydrogels with multistimuli responsive properties through the formation of borate/didiol bonds to enrich the avenue in the exploration of multifunctional guar Gum based hydrogel to expand their potential applications in various fields.
Abstract: In this work, we prepare guar gum-based supramolecular hydrogel through the formation of borate/didiol bonds. This dynamic and reversible noncovalent borate/didiol interaction is critical for the multifunctional properties of supramolecular hydrogel. The FT-IR and XRD analysis verified the existence of boronate ester interactions between borax and guar gum. Moreover, the viscoelastic and mechanical behaviors of the hydrogels with different guar gum concentrations showed that the storage modulus and compressive stress were highest at guar gum concentration of 2 wt %. Besides, due to the dynamic and reservable properties of boronate ester, these guar gum-based hydrogels had excellent self-healing property, outstanding reformable and injectable capability. In addition, hydrogels also exhibited reversible gel–sol transformations by the application of physicochemical stimuli such as thermal and pH value. The coupling of these multifunctional properties made from low-cost, environment friendly, and readily avai...
TL;DR: It is proved that dual network self-healing alginate/guar gum hydrogels with polydopamine-type microcapsules from mesoporous silica nanoparticles were facilely prepared through one-pot method and exhibit excellent self- healing performance at ambient temperatures.
TL;DR: In this article, Cumin seed oil (CSO) nanoemulsions were prepared using an ultrasonication method with preheated 10% wt whey protein isolate (WPI) and 0.2% Wt guar gum (GG) as aqueous phase, and mix of CSO and corn oil (30:70) as an oil phase.
Abstract: Cumin seed oil (CSO) nanoemulsions were prepared using an ultrasonication method with preheated 10% wt whey protein isolate (WPI) and 0.2% wt guar gum (GG) as an aqueous phase, and mix of CSO and corn oil (30:70) as an oil phase. The droplet size of the emulsion was about 75 nm. The physical stability of the emulsion improved significantly in the presence of GG (0.1–0.2% wt). Based on FTIR analysis, interaction of reducing groups of GG with amino groups of WPI occurred through covalent attachment, which was verified using sodium-dodecyl-sulfate (SDS) polyacrylamide gel electrophoresis (PAGE). The glycosylated fraction of protein was ∼110 kDa. Minimum bactericidal concentrations (MBC) of CSO nanoemulsions were 2.27 and 0.6 mg/mL against Staphylococcus aureus and Escherichia coli, respectively. The killing kinetics assays showed that CSO nanoemulsions were able to kill these microorganisms after 15 and 5 min of incubation, respectively. In the case of Aspergillus flavus, the inhibition zone of CSO nanoemulsions with different concentrations of CSO (15, 5, 3 mg/mL) ranged between (32-10 mm) after 5 days of incubation at 25 °C. Moreover, based on a cytotoxicity assay, CSO nanoemulsions showed good biocompatibility. It can be concluded that WPI-GG stabilized CSO nanoemulsions may have the potential to be used in food as an effective preservative.
TL;DR: The molecular weight of guar gum had a predominating role in modifying the functional properties of pearl millet starch and higher G' and G″ values were obtained after the addition of NGG and GGH, suggesting the formation of more solid like pastes.
TL;DR: The cytotoxicity study reveals that the pure polymeric system has no toxic effect whereas drug loaded ones showed superior activity against THP-1 cells which indicate that the hydrogel based micelle system is an excellent material for the mucoadhesive on intracellular alveolar macrophage treatment.
TL;DR: In this article, the depression effects and mechanisms of tragacanth gum to talc were studied and its role in the flotation separation of chalcopyrite from talc was investigated by flotation test, adsorption and zeta potential tests as well as XPS analysis.
Abstract: Guar gum is an effective depressant of talc, but it also has some depression effect on sulfide minerals. To find new selective depressants, the depression effects and mechanisms of tragacanth gum to talc were studied and its role in the flotation separation of chalcopyrite from talc was investigated by flotation test, adsorption and zeta potential tests as well as XPS analysis. The individual mineral flotation test results showed that the natural flotability of talc is good which make it easy to be reported into the concentrate. The guar gum and tragacanth gum can effectively depress the flotation of talc, and their depression effect is not affected by pH. The mixed minerals flotation tests indicated that the tragacanth gum can effectively separate chalcopyrite from talc, both the copper concentrate grade and recovery are high, besides, tragacanth gum exhibits less depression effects for chalcopyrite compared with guar gum. According to the Zeta potential and XPS measurements, it can be concluded that tragacanth gum adsorbed on talc surface mainly through physical interactions, and hydrophobic interaction was considered as the main driving force and hydrogen bond may also play a role.
TL;DR: In this article, an elaborate study on the engineering behavior of guar gum-treated soil, a gum-based biopolymer, is carried out through a concise experimental program and the results show that there is no appreciable degradation of the treated soil samples within the investigated period of 90 days.
TL;DR: In this article, an aqueous dispersion of potato starch with or without gums was subjected to mild heating and cooling, freezing and thawing, and a combination of both treatments (HCFT) for physical modification of the starch.
TL;DR: The compound was resistant to extreme conditions and presented stable surface tension and emulsification activity in alkaline pH and was characterized as a carbohydrate-lipid-protein complex showing the best formulation and consistency indicating potential applicability in food emulsions.
Abstract: This study aimed at characterizing a biosurfactant from Candida utilis, and use it in the preparation of salad dressings. The biosurfactant was produced in mineral medium supplemented with 6% glucose and 6% waste frying canola oil. The crude biosurfactant was then tested for stability in different conditions of pH, salt concentration, heating time and temperature. The critical micelle dilution, chemical composition, and structural analysis were determined. The compound was resistant to extreme conditions and presented stable surface tension and emulsification activity in alkaline pH and was characterized as a carbohydrate-lipid-protein complex showing the best formulation and consistency at 0.7% (w/v) with guar gum indicating potential applicability in food emulsions.
TL;DR: In this article, the combined effect of substrate composition and humectant agents on the water-holding capacity and growth of Lolium multiflorum in different mixtures based on municipal solid waste composts was evaluated.
TL;DR: It is demonstrated that supplementation with partially hydrolyzed guar gum to diets of constipated autism spectrum disorders children helped improve constipation and gut dysbiosis symptoms, which in turn helped attenuate the level of serum inflammation cytokines and behavioral irritability.
Abstract: Prebiotic dietary water-soluble fiber obtained from partially hydrolyzed guar gum was added to diets of children with autism spectrum disorders who presented constipation symptoms. Supplementation with partially hydrolyzed guar gum altered gut microbiota and significantly increased the frequency of defecation per week and altered the gut microbiota. In addition, supplementation with partially hydrolyzed guar gum significantly (p<0.05) decreased and tended to decrease (p = 0.07) the concentrations of serum interleukin-1β and tumor necrosis factor-α, respectively. More importantly, supplementation with partially hydrolyzed guar gum significantly ameliorated behavioral irritability as per the Aberrant Behavior Checklist, Japanese Version. The present study demonstrated that supplementation with partially hydrolyzed guar gum to diets of constipated autism spectrum disorders children helped improve constipation and gut dysbiosis symptoms, which in turn helped attenuate the level of serum inflammation cytokines and behavioral irritability.
TL;DR: In this article, a cost effective palladium nano catalyst was prepared using the green method of synthesis with guar gum as capping and reducing agent, the formation of palladium nanoparticles were confirmed by UV-spectrophotometer while for morphology and nature, SEM and XRD were performed that confirmed the crystalline nature of PdNPs and proved the roughly spherical shape of nanoparticles.
Abstract: Abstract Palladium is very expensive metal and has numerous applications especially as a versatile hydrogenation and dehydrogenation catalyst for chemical reactions. The main hurdle in its wide use is the high materials cost. In the present study a cost effective palladium nano catalyst was prepared using the green method of synthesis with guar gum as capping and reducing agent. The formations of palladium nanoparticles were confirmed by UV-spectrophotometer while for morphology and nature, SEM and XRD were performed that confirmed the crystalline nature of PdNPs and proved the roughly spherical shape of nanoparticles. FT-IR analysis showed different functional groups of reducing agent and proved that guar gum have the ability to stabilized as well as to reduce the Pd (II) to Pd (0). Specific signal for the palladium is present in EDX spectra that further confirmed the formation of PdNPs. The catalytic efficiency was studied using the hydrogenation of 4-nitrophenol. Rate constant of prepared nano-catalyst was 0.1436/min, its efficiency, TON, TOF, in above mention reaction is 90.83, 27.78, and 185.2/hrs, respectively. Data obtained proved synthesized PdNPs to be efficient heterogeneous catalyst for the reduction of 4-NP and for the degradation of azo dyes.
TL;DR: In this paper, the impact of the polysaccharides on the hydrate microstructure was investigated using powder X-ray diffraction and Raman spectroscopy, and the authors found that the polymers exhibited good biodegradability and increased the maximum subcooling of hydrate formation.
TL;DR: Overall, addition of galactomannans affected the rheological and textural properties of tapioca starch.
TL;DR: In this paper, a systematic investigation on the flocculation, sedimentation and consolidation characteristics of kaolinite using guar gum as a green flocculant was performed.
Abstract: This paper reports the systematic investigation on the flocculation, sedimentation and consolidation characteristics of kaolinite using guar gum as a green flocculant. In-situ flocculation behavior of kaolinite at various pH, guar gum dosages, and ionic strength were studied using a light scattering technique. The effect of these parameters on the settling rate, solid consolidation, and supernatant liquid clarity was recorded. The morphology of kaolinite and flocculated kaolinite aggregates were analyzed using FESEM. The morphology studies suggest that it is poorly crystalline with multiple steps on edge, broken edge; laminar with high aspect ratio and have rough basal surface. The complex irregularity on the basal surface and the presence of multiple steps in the edges, broken edges (hydroxyl groups) have facilitated the guar gum adsorption. The isoelectric point of kaolinite is pH 3.96. The pH, ionic strength and flocculant dosage have a significant effect on the kaolinite settling rate. The guar gum has exhibited excellent turbidity removal efficiency at pH 5. The turbidity removal is inefficient at pH 10. However, guar gum has shown high turbidity removal with 80% transmission at pH 10 in the presence of a KNO3 electrolyte.
TL;DR: In this paper, the authors have used transglutaminase (MTGase) to enhance the mechanical and barrier properties of composite polysaccharides, proteins and lipids for synthesis of polymer matrices.
Abstract: Polysaccharides, proteins and lipids have been utilized for synthesis of polymer matrices to minimize environmental pollution caused by plastic food packaging. Edible coatings are one of the promising alternative in this regard. The coconut protein-guar gum composite films were prepared and studied for their mechanical and barrier properties. Addition of transglutaminase to the composite film forming solution significantly increased the mechanical strength from 1.76 MPa to 3.79 MPa and elongation from 56 mm to 184.87 mm. Improved barrier properties such as water vapour permeability and oxygen transfer rates were observed after treatment of composite films with microbial transglutaminase (MTGase). Differential scanning calorimetric analysis demonstrated an increase in melting temperature with increasing concentration of MTGase. FTIR spectroscopy showed changes in the secondary structure of the protein (amide I and amide II band) and its interaction with the polysaccharide. Major coconut protein having a molecular weight of 53 kDa was not visible in MTGase treated films due to MTGase induced polymerization of protein as analyzed using SDS-PAGE electrophoresis. Scanning electron microscopy exhibited a fibrous microstructure of the surface of the MTGase treated coconut protein guar gum composite films.
TL;DR: In this article, the use of low-dosage hydrate inhibitor (LDHI) is discussed for offshore oil and gas well formation and deposition during drilling offshore oil/gas wells.
Abstract: Hydrate formation and deposition during drilling offshore oil and gas wells has been one of the major challenges faced by the oil and gas industry. The use of low-dosage hydrate inhibitor (LDHI), s...
TL;DR: High affinity for cellulose and moderate hydration were found to be important requirements for polysaccharides to improve the mechanical properties of CNF-based composites in wet conditions and can support the development ofpolysaccharide-based materials for different packaging and medical applications.