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: A β-1,4-mannanase that belongs to the GH 134 family was identified in the filamentous fungus Aspergillus oryzae and was stable within a neutral-to-alkaline pH range, as well as exhibiting stability in the presence of a range of organic solvents, detergents, and metal ions, suggesting that AoMan134A could be useful in a diverse range of industries.
Abstract: 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. After incubation at 70°C for 120 min, the activity of AoMan134A toward glucomannan decreased to 50% of the maximal activity at 30°C. AoMan134A retained 50% of its β-1,4-mannanase activity after heating at 90°C for 30 min, indicating that AoMan134A is thermostable. Furthermore, AoMan134A was stable within a neutral-to-alkaline pH range, as well as exhibiting stability in the presence of a range of organic solvents, detergents, and metal ions. These findings suggest that AoMan134A could be useful in a diverse range of industries where conversion of β-mannans is of prime importance.

41 citations

Journal ArticleDOI
TL;DR: The results of this study increase the understanding of the possible mechanisms influencing the impact of oat constituents on lipid digestion and highlights the importance of considering the molecular properties of polysaccharides, and not just their impact on solution viscosity.

41 citations

Journal ArticleDOI
TL;DR: In this article, a non-specific enzyme pullulanase (from Bacillus acidopullulyticus ) was used to remove galactose residues from guar galactomannan to obtain modified guar GA to obtain a modified GA mimicking the functional properties of locust bean gum.

41 citations

Journal ArticleDOI
TL;DR: Composition of Avicel PH-101 had positive effects for both hardness and friability tests of the tablets, and Maltodextrin and okara composition had a significant positive effect on tablets' hardness, but not on percentage of friability of tablets.
Abstract: The usage of soy is increasing year by year. It increases the problem of financial crisis due to the limited sources of soybeans. Therefore, production of oral tablets containing the nutritious leftover of soymilk production, called okara, as the main ingredient was investigated. The okara tablets were produced using the direct compression method. The percentage of okara, guar gum, microcrystalline cellulose (Avicel PH-101), and maltodextrin influenced tablets' hardness and friability which are analyzed using a D-optimal mixture design. Composition of Avicel PH-101 had positive effects for both hardness and friability tests of the tablets. Maltodextrin and okara composition had a significant positive effect on tablets' hardness, but not on percentage of friability of tablets. However, guar gum had a negative effect on both physical tests. The optimum tablet formulation was obtained: 47.0% of okara, 2.0% of guar gum, 35.0% of Avicel PH-101, and 14.0% of maltodextrin.

41 citations

Journal ArticleDOI
TL;DR: In this paper, the intrinsic particle size distributions (PSD) of two expansive clays, a Ca- and a Na-montmorillonite, were evaluated using a laser particle size analyzer under varying flow conditions, and the influence of biological, chemical, and hydrodynamic factors on their flocculation and PSD was discussed.
Abstract: Expansive clay sediments are abundant in riverine and estuarine waters and bottom beds, and their particle size distributions (PSD) are important for the analysis of sediment transport. This paper presents an experimental study to evaluate, using a laser particle size analyzer under varying flow conditions, the intrinsic PSD of two expansive clays, a Ca- and a Na-montmorillonite and the influence of biological, chemical, and hydrodynamic factors on their flocculation and PSD. The considered biological factor consists of three extracellular polymeric substances of varying polarity, including xanthan gum, guar gum, and chitosan; the chemical factor is the salinity; and the hydrodynamic factor is the types of flow indicated by the Reynolds number and shear rate. The intrinsic PSD of both clays show a multimodal lognormal distribution with sizes ranging from 0.2 to 50 μm. All three biopolymers, xanthan gum, guar gum, and chitosan, can facilitate flocculation through long-range polymer bridging and short-range ion-dipole interaction, hydrogen bonding, and Coulomb force. The influence of salinity is different for the two clays: the particle size of the Na-montmorillonite increases with salinity, which is caused by flocculation resulting from the suppressed electrical double layer, while that of the Ca-montmorillonite is slightly reduced owing to the decreased basal spacing and cation exchange. For different hydrodynamic conditions, higher shear rate promotes the flocculation of Ca-montmorillonite, but breaks the Na-montmorillonite flocs. The significance of understanding the flocculation and PSD of expansive clays is also discussed in terms of sediment transport under different aquatic environments.

41 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