Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"Guar"”.
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Copper electrodeposition in the presence of guar or activated polyacrylamide
… organic additive ‘activated polyacrylamide’ and Guartec (Guar), the industry-standard organic additive for electrowinning under industrial conditions. The first half of the thesis presents the results of bulk electrolysis experiments using either a rotating cylinder electrode (RCE) or parallel …
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Evaluation of Xanthan/Enzymatically Modified Guar Gum Mixtures in Oil-in-Water Emulsions
… was to evaluate xanthan/enzymatically modified guar (XG/EMG) polysaccharides on the physical and oxidative stability of 2 wt% whey protein stabilized oil-in-water emulsions containing 20% v/v menhaden fish oil. Enzymatic modified guar gum was obtained by hydrolyzing native guar gum using …
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Enzymes Involved in the Utilization of the Galactomannan, Guar Gum, by Bacteroides Ovatus
When Bacteroides ovatus is grown on guar gum, a galactomannan, it produces an (alpha)-galactosidase (I) which is different from the (alpha)-galactosidase (II) it produces when it is grown on galactose, melibiose, raffinose or stachyose. I have purified both of these enzymes to apparent homogeneity. …
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Guar and locust bean gums as partial replacers of all-purpose flour in bread: an objective and sensory evaluation
… replaced with locust bean gum (LBG) and guar gum, and produce an acceptable bread product. A pilot study determined that up to 4% gum replacement for flour was feasible. All bread treatments were evaluated objectively by standing height, texture, color, and cell size. Moisture …
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Development and characterization of edible films made from four dietary fibers -pectin, guar gum, locust bean gum, and hydroxypropyl methylcellulose
… polymer concentration of 4 dietary fibers, e.g., guar gum, locust bean gum, pectin, and hydroxypropyl methylcellulose, and glycerol concentration to the mechanical properties and dissolution/ partial dissolution time of their films and the viscosity of their solution. Specifically, it investigates …
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The Effect of Xanthan Gum and Guar Gum on Enhancing the Quality and Preventing Lipid Rancidity in Yeast Bread Supplemented with Flaxseed
This study examined the effects of guar gum and xanthan gum on flax supplemented breads through objective and sensory testing. Breads containing flaxseed and gums were found to have a significantly (p<0.05) higher water activity than the control bread. Control bread was also found to have a higher …
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The interactive effect of depressant type and dosage with frother dosage in the flotation of a PGE ore
… of depressants carboxymethyl cellulose (CMC) and guar gums which are usually used in the flotation of PGE bearing ores were used. The frother was Dow 250. Results showed that increasing either guar or CMC dosages from 50 to 100 g/t enhanced the recovery of copper and nickel sulphides. This was …
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The effect of different sources of dietary fiber on the plasma total and lipoprotein cholesterol, liver cholesterol, fecal neutral steroid excretion and histology of major organ tissues in hamsters
… six groups for another 4 wk: control, oat bran, guar gum, cellulose, xylan and sacrifice. After 4 wk of the fiber diets (10% dietary fiber), the plasma TC levels were significantly lowered in the oat bran, guar gum and xylan groups (16%, 12% and 15%, respectively) (p<.05). They were also …
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Investigation of the surface properties of gangue minerals in PGM bearing ores
… as carboxymethyl cellulose (CMC) and modified guar gums are used to reduce the floatability of naturally floatable gangue and may also be able to reduce the floatability of activated gangue. This study examines the copper activation of a range of minerals found in the Bushveld Complex (namely …
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The effect of exopolymers on the compressibility and shear strength of kaolinite
… methods for using two exopolymer analogues, guar gum and xanthan gum, to change the properties of a pure kaolinite. Changes in the compressibility of biopolymer and kaolinite mixtures were measured using 1D consolidation and triaxial tests. Also, modifications of shear strength were measured …
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A novel nutritional approach to the management of type 2 diabetes: effects of nutritional preloads on postprandial blood glucose and gastric emptying in type 2 diabetes mellitus
… acute effects of low dose ‘preloads’ of whey and guar, given alone or in combination before a meal, on postprandial glycaemia, GLP-1, insulin, and gastric emptying 4) The evaluation of the effects of 12 weeks’ treatment with a whey/guar preload on gastric emptying, postprandial glycaemia, and …
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Modelling of physical and chemical processes in the small intestine
… have shown that the functional ingredient guar gum reduces the mass transfer coefficient of the model nutrient riboflavin. This together with computational modelling suggests an explanation for the observed functionality of guar gum to reduce the peak increase in blood glucose levels after …
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Investigating the performance of high viscosity friction reducers used for proppant transport during hydraulic fracturing
… of HVFRs compared to a traditional linear guar gel. Experimental rheological characterization was studied to investigate the viscoelastic property of HVFRs on proppant transport. In addition, the successful implication of utilizing HVFRs in the Wolfcamp formation, in the Permian Basin was …
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Urinary carbohydrates as an indicator of digestion and absorption of dietary fiber in a monogastric animal
… rats were then fed diets containing 5 percent guar gum (a galactomannan), 10 percent xylan (a polymer of xylose), or 10 percent wheat bran. The appearance in the urine of the component carbohydrates of the ingested dietary fiber was used as an indication of the absorption of the carbohydrates …
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Mucoadhesive buccal tablets for the delivery of nicotine and Delta9-tetrahydrocannabinol.
… formers including xanthan gum, karaya gum, guar gum and glycol chitosan were investigated for the ability to provide controlled nicotine release and adhesion to animal buccal mucosa. Different release mechanisms were identified in the polysaccharides including anomalous transport, (xanthan …
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Preparing Main Group Metal Clusters from Organoaluminium Reagents; New Possibilities in Alkali-Activated Polymer Crosslinking
… of aluminium compounds in the crosslinking of guar and carboxymethyl hydroxypropyl guar, which are common additives in hydraulic fracturing. Different commercially available aluminium compounds were tested for their general ability to crosslink the aforementioned polysaccharides, yielding …
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Investigating the relative adsorption of polymeric depressants on pure minerals
… and chalcopyrite and the depressants used were guar gum and carboxymethyl cellulose (CMC). It was hypothesised at the beginning of this study that polymeric depressants adsorb preferentially onto different minerals because of the differences in the surface charge of the minerals which arise as a …
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Nutritional strategies to control clostridium perfringens in gastrointestinal tract of broiler chickens
… or soy protein concentrate) and soluble fiber (guar gum). Clinical NE was not observed, however, there was a high level of C. perfringen colonization especially in guar gum fed birds. The next set of experiments examined the effect of various levels of DL-Met or MHA-FA on C. perfringen and other …
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The influence of polymeric charge and structure, molecular weight and ionic conditions on depressant ability to reduce the natural floatability of talc
… depressants (carboxymethylcellulose and guar gum) with pure talc and with Merensky PGM ore (which is known to contain talc as a gangue constituent). Specifically, the objectives of this thesis were as follows: 1. To characterize the differences in the depressants selected. 2. To examine …
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