scispace - formally typeset
Search or ask a question
Topic

Guar gum

About: Guar gum is a research topic. Over the lifetime, 5611 publications have been published within this topic receiving 105940 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, a hydrocolloid from leaves of Corchorus olitorius L. was fractionated with ammonium sulfate solution (50%, w/v) followed by the stepwise extraction with distilled water.

35 citations

Patent
01 Sep 1988
TL;DR: A hyposensitization agent was prepared by covalently attaching a saccharide, e.g., homo-and heteroglycans, to a cedar pollen allergen.
Abstract: A novel hyposensitization agent was prepared by covalently attaching a saccharide, e.g. homo- and heteroglycans, for example, starch, amylose, dextran, polysucrose, pullulan, elsinan, curdlan, gum arabic, gum tragacanth, guar gum, xanthan gum carrageenan, pectin, cellulose, glucomannan, chitosan, and lipopolysaccharide, and their derivatives and partial hydrolysates to, a cedar pollen allergen. The hyposensitization agent can be administered to a cedar pollinosis patient without fear of eliciting anaphylaxis and allergy within a shortened hyposensitization period because the hyposensitization agent much more enhances the production of immunoglobulin G and M antibodies which are specific to intact cedar pollen allergen, but extremely reduces the production of immunoglobulin E antibody which is specific to the allergen and responsible for anaphylaxis and allergy.

35 citations

Journal ArticleDOI
TL;DR: In this paper, chestnut flour (CF) doughs with arabic gum (AG), carboxymethyl cellulose (CMC), guar gum (GG) and tragacanth gum (TG) at different concentrations (up to 2.0%) were determined at 30°C using a controlled stress rheometer.
Abstract: Summary Rheology of chestnut flour (CF) doughs with arabic gum (AG), carboxymethyl cellulose (CMC), guar gum (GG) and tragacanth gum (TG) at different concentrations (up to 2.0%) were determined at 30 °C using a controlled stress rheometer. The mixing characteristics at 30 °C were achieved using Mixolab® apparatus. Shear (0.01–10 s−1), oscillatory (1–100 rad s−1 at 0.1% strain), creep-recovery (50 Pa for 60 s) and temperature sweep (30–100 °C) tests were performed. Rheological properties were significantly modified by gum added. Apparent viscosity of CF doughs, storage and loss moduli increased at content of AG (above 0.5%), CMC (at 1.0%), GG (above 1.5%) and TG (at 1.0%). Flow curves and mechanical spectra were fitted using Cross model and power models, respectively. The gelatinisation temperatures increased with gums. The same pasting trend was noticed using Mixolab®. Creep-recovery data, fitted by Burgers model, showed that elasticity of CF doughs improved with GG.

35 citations

Journal ArticleDOI
TL;DR: In this article, a simplified cross model was proposed to fit the shear-dependent viscosity behavior for both gums and showed that the dependence was linear for flow index, power for time constant and exponential for zero-shear rate viscosities.
Abstract: Rheological studies of tragacanth and guar gums dispersions were carried out by means of steady shear (3 to 1000/s) and small amplitude oscillatory shear experiments (0.1 to 10 rad/s) for concentrations up to 8.9 g/L for tragacanth and 7.6 g/L for guar gum at 25C using stress controlled rheometer. The dispersions exhibited shear-thinning characteristics. A simplified Cross model was adequate to fit the shear-dependent viscosity behavior for both gums. Model parameters for guar gum were correlated with concentration employing power functions (with flow index constant) and for tragacanth gum the dependence was linear for flow index, power for time constant and exponential for zero-shear rate viscosity. Mechanical spectra revealed that dispersions behave as dilute systems of coil polymers with trend to entangled systems at the highest concentrations. Loss and storage moduli were correlated with frequency and the resulting parameters were correlated with concentration. Cox–Merz rule holds satisfactorily. PRACTICAL APPLICATIONS Guar and tragacanth gums are natural thickeners that have many applications in pharmaceutical, food, paper, textile, oil painting and cosmetic industries, among others. The addition of these hydrocolloids at low concentration to systems can give a great variety of functions such as enhancement of viscosity, improvement of texture, formation of films, encapsulation of flavors, creation of gel-structures, etc. In this work, mathematical relationships are proposed for the variation of apparent viscosity and loss and storage moduli with concentration for both gums.

35 citations

Journal ArticleDOI
TL;DR: In this paper, the grafting of acrylamide onto guar gum in aqueous medium initiated by KMnO4/oxalic acid redox system has been studied gravimetrically at the temperature 35 ± 0.2°C.
Abstract: The grafting of acrylamide onto guar gum in aqueous medium initiated by KMnO4/oxalic acid redox system has been studied gravimetrically at the temperature 35 ± 0.2°C. The effect of redox components, acrylamide concentration and quantity of guar gum has been studied in terms of percentage and efficiency of grafting. A plausible mechanism of grafting and a suitable rate expression has been suggested. The rate of grafting was found to increase with increase in temperature and concentrations of redox components and acrylamide, but, at high concentration of guar gum, the rate was found to decrease.

35 citations


Network Information
Related Topics (5)
Antioxidant
37.9K papers, 1.7M citations
81% related
Fatty acid
74.5K papers, 2.2M citations
78% related
Drug delivery
49.7K papers, 1.8M citations
76% related
Fermentation
68.8K papers, 1.2M citations
76% related
Cellulose
59K papers, 1.4M citations
75% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023188
2022416
2021211
2020231
2019262
2018298