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Letteratura scientifica selezionata sul tema "GUAR GUM DERIVATIVES"

Autore: Grafiati

Pubblicato: 11 settembre 2023

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Articoli di riviste sul tema "GUAR GUM DERIVATIVES"

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Iqbal, Dure Najaf, Arif Nazir, Munawar Iqbal e Muhammad Yameen. "Green synthesis and characterization of carboxymethyl guar gum: Application in textile printing technology". Green Processing and Synthesis 9, n. 1 (17 marzo 2020): 212–18. http://dx.doi.org/10.1515/gps-2020-0022.

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AbstractThis study focusses on the synthesis of carboxymethyl guar gum (CMG) via monochloroacetic acid under alkaline conditions. The reaction conditions were also optimized during the course of experiment. Guar derivative with variable degree of substitution (DS) were prepared and were confirmed by Fourier transform infrared (FTIR) spectroscopy. The DS was determined quantitatively by titration method for each derivative. The synthesized guar gum derivatives, being the natural thickners, have been used in textile printing technology. Substituted guar gum has been proved environmental friendly thickener as compared to synthetic thickeners. Penetration properties, fixation ability, colour fastness, levelness and fabric handling was compared with alginate thickener (commercially available). Guar gum thickeners showed enhanced properties versus alginate thickener and can be used as an alternative to synthetic thickeners in view of its green, non-hazardous and economical derivatives. Guar gum is the outstanding natural thickener, stabilizer, gelling agent and could possibly be used in various industrial units including food, cosmetic, textile, oil fracturing and mining.

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2

Vyšvařil, Martin, Michaela Hegrová e Tomáš Žižlavský. "Rheological Properties of Lime Mortars with Guar Gum Derivatives". Key Engineering Materials 760 (gennaio 2018): 257–65. http://dx.doi.org/10.4028/www.scientific.net/kem.760.257.

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In this paper, the behaviour of fresh lime mortars modified by etherified derivatives of guar (hydroxypropyl guar (HPG), carboxymethyl hydroxypropyl guar (CMHPG) and native guar gum (GG)) is assessed with the purpose of exploring a new application of such derivatives as lime mortar admixtures. The rheological parameters (relative yield stress, consistency coefficient and fluidity index) and viscoelastic properties were correlated with flow table tests, relative density measurements, water retention abilities of mortars and air content in mortars. Results were seen to be strongly dependent on substituents of the guar. Non-ionic derivative (HPG) exhibited the biggest impact on the yield stress and elastic properties of the mortars. The ionic CMHPG showed the thickening effect. GG had low impact on water retention, while HPG and CMHPG displayed high water retention capability.

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Giri, Pankaj, Simran Kaur Zandu e Inderbir Singh. "Chemical Modifications of Guar Gum for Drug Delivery Applications: A Review". Asian Journal of Chemistry 32, n. 6 (2020): 1259–65. http://dx.doi.org/10.14233/ajchem.2020.22607.

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Guar gum is a natural excipient extracted from the plant seed of Cyamopsis tetragonolobus, belonging to the Leguminosae family. In the pharmaceutical industries, it contributes an important role due to its non-toxicity, ease of availability, biodegradability and eco-friendly nature. The major constituents of guar gum is galactomannan which is composed of D-galactose anhydride and mannose anhydride. Hydroxyl groups present in galactomannan can be modified by carboxymethylation, grafting or cross-linking with other excipients for developing modified polymers having desirable properties. Guar gum is commonly used as a suspending, emulsifying, stabilizing, gelling and thickening agent in various dosage forms. The guar gum derivatives are also useful in controlling the drug release from the pharmaceutical dosage forms. In this review, different aspects of synthesis of guar gum derivatives and its applications in various drug delivery systems is described.

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Kapoor, Meenu, Dhriti Khandal, Ruchi Gupta, Pinklesh Arora, Geetha Seshadri, Saroj Aggarwal e Rakesh Kumar Khandal. "Certain Rheological Aspects of Functionalized Guar Gum". International Journal of Carbohydrate Chemistry 2013 (24 aprile 2013): 1–15. http://dx.doi.org/10.1155/2013/463907.

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Guar gum and its derivatives are highly important industrial hydrocolloids as they find applications in various industrial sectors. Guar is a polymer of high molecular weight and its aqueous solutions exhibit unique rheological properties, which has led to its wide acceptance by the industry. In certain industrial applications low molecular weight guar and its derivatives are needed, and conventionally chemical depolymerisation of guar is carried out for this purpose. Radiation processing is a novel and green technology for carrying out depolymerization and can be an ideal substitute for chemical depolymerisation technique. In order to study the effect of radiation on guar derivatives, three types of derivatives have been taken in the present study: carboxymethyl, hydroxyethyl, and methyl guar. The effect of 1–50 KGy radiation dose on the rheological behavior of these derivatives has been studied, and the results have been described in the present paper. The effect on storage and loss modulus with respect to frequency and effect on viscosity with respect to shear rate have been discussed in detail.

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Lapasin, Romano, Sabrina Pricl e Paolo Tracanelli. "Rheology of hydroxyethyl guar gum derivatives". Carbohydrate Polymers 14, n. 4 (gennaio 1991): 411–27. http://dx.doi.org/10.1016/0144-8617(91)90006-x.

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Shanmukha, M. C., A. Usha, M. K. Siddiqui, Samuel Asefa Fufa e B. M. Praveen. "Degree-Based Molecular Descriptors of Guar Gum and Its Chemical Derivatives". Journal of Chemistry 2022 (7 febbraio 2022): 1–14. http://dx.doi.org/10.1155/2022/7371538.

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The most abundant polycarbonates that are found in food are polysaccharides. A long chain of monosaccharide with glycosidic linkages forms polymeric carbohydrates. These carbohydrates with water in the process of hydrolysis produces sugar monosaccharides or oligosaccharides. The examples of polysaccharides include starch, galactogen, and glycogen. They contribute various applications mainly in food storage, pharmaceutical industry, and petroleum extraction. In this work, a polysaccharide known as guar gum is studied and also ten degree-based topological indices, namely, Zagreb indices, Randic index, general Randic index, forgotten index, ABC index, GA index, GH index, Sombor index, and SS index are computed. The chemical derivatives of guar gum such as HPG, CMG, and CMHPG are studied, and topological indices are determined. Finally, numerical and graphical comparison of all the above said ten indices are made for guar gum and its chemical derivatives.

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Kazachenko, A. S., O. Yu Fetisova, A. V. Antonov, G. N. Bondarenko e V. V. Sychev. "PRODUCTION AND DESCRIPTION THE CHARACTERIZATION OF GUAR GUM GALACTOMANNAN BUTYL ETHER". IRAQI JOURNAL OF AGRICULTURAL SCIENCES 53, n. 1 (23 febbraio 2022): 198–206. http://dx.doi.org/10.36103/ijas.v53i1.1525.

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Guar gum galactomannan is a common polysaccharide isolated from the legume plants Cyamopsis tetraganoloba. Guar gum derivatives are widely used in many industrial fields. In this work, a method for obtaining a new derivative of guar gum, galactomannan butyl ether, is considered. The introduction of the butyl group into the structure of galactomannan was proved by IR spectroscopy, by the appearance of absorption bands in the regions corresponding to the vibrations of the –C – O – C–, CH2 and CH3 groups. According to X-ray diffraction data, it was shown that in the process of obtaining butyl ether of galactomannan, the structure is amorphous. According to the data of scanning electron microscopy, the powder of galactomannan butyl ether has a porous morphology. The pore sizes in the particles of galactomannan butyl ether range from 70 to 300 μm. The obtained galactomannan butyl ether can find application in medicine - as a filler for tablets, in construction - as an additive for adhesives and in other fields.

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Prabhanjan, H., M. M. Gharia e H. C. Srivastava. "Guar gum derivatives. II. Foaming properties of hydroxyalkyl derivatives". Carbohydrate Polymers 12, n. 1 (gennaio 1990): 1–7. http://dx.doi.org/10.1016/0144-8617(90)90100-7.

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Dodi, Gianina, Rosina E. Sabau, Bianca E. B. Crețu e Ioannis Gardikiotis. "Exploring the Antioxidant Potential of Gellan and Guar Gums in Wound Healing". Pharmaceutics 15, n. 8 (17 agosto 2023): 2152. http://dx.doi.org/10.3390/pharmaceutics15082152.

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It is acknowledged that the presence of antioxidants boosts the wound-healing process. Many biopolymers have been explored over the years for their antioxidant potential in wound healing, but limited research has been performed on gum structures and their derivatives. This review aims to evaluate whether the antioxidant properties of gellan and guar gums and wound healing co-exist. PubMed was the primary platform used to explore published reports on the antioxidant wound-healing interconnection, wound dressings based on gellan and guar gum, as well as the latest review papers on guar gum. The literature search disclosed that some wound-healing supports based on gellan gum hold considerable antioxidant properties, as evident from the results obtained using different antioxidant assays. It has emerged that the antioxidant properties of guar gum are overlooked in the wound-healing field, in most cases, even if this feature improves the healing outcome. This review paper is the first that examines guar gum vehicles throughout the wound-healing process. Further research is needed to design and evaluate customized wound dressings that can scavenge excess reactive oxygen species, especially in clinical practice.

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Swamy, N. G. N., T. S. Dharmarajan, K. L. K. Paranjothi e Z. Abbas. "A REVIEW ON DERIVATIZATION OF GUAR AND STUDY OF PHARMACEUTICAL APPLICATIONS OF GUAR DERIVATIVES". INDIAN DRUGS 51, n. 01 (28 gennaio 2014): 5–17. http://dx.doi.org/10.53879/id.51.01.p0005.

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Abstract (sommario):

Guar gum is a naturally occurring alternating co-polymer derived from the seeds of Cyamopsis tetragonoloba. Guar has high intrinsic viscosity but very poor interaction coefficient. Guar dispersions lose viscosity upon standing. Guar has been derivatized to hydroxyalkyl, alkali carboxyalkyl and quaternary ammonium guar. Derivatization of guar enhances solution stability, clarity of dispersion and resistance to microbial attack. Derivatives of guar have immense pharmaceutical and cosmetic applications. The present review focuses on the various methodologies available for effecting derivatization of guar and also covers the specific application case studies in pharmaceutical and cosmeceutical fields. The authors opine that guar derivatives such as hydroxypropyl guar, sodium carboxymethyl guar and cationic guar are the prominent ones and shall be accorded an official status.

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Più fonti

Tesi sul tema "GUAR GUM DERIVATIVES"

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Young, Niall William George. "The solution properties of hydrophobically modified guar gum derivatives". Thesis, University of Salford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360604.

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GARG, PIYUSH. "STUDIES ON HYDROGELS BASED ON POLYACRYLAMIDE AND GUAR GUM DERIVATIVES". Thesis, 2013. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15677.

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As we all know the importance of green chemistry synthesis and characterization of environmental friendly modified natural polymers is need of time. These natural polysaccharides also eliminates the danger to health and environment. Guar gum is one of the important naturally occurring polymer having wide applications due to its rheological modifying properties in medicinal, pharmaceutical, food, textile and scores of other industrial and commercial sectors. There has been wide study on physiochemical and pharmaceutical properties of guar gum but study on modified guar gum and its derivatives are quite lacking. Unmodified guar gum has certain drawbacks like lack of clarity and free flowing properties, fall in viscosity and turbidity on prolong stay, etc. These draw backs can be overcome by modifying and derivatization of guar gum and can be used in multidiscipline fields. In this work we are preparing blend biodegradable interpenetrating polymer networks(IPNs) hydrogels using polymers both from natural sources and synthetic ones i.e Carboxymethyl guar gum along with Polyacrylamide with varying concentrations of carboxymethyl guargum and evaluate their properties, characteristics and their potential applications in different areas of biomedical and pharmaceutical applications. Characterization of synthesized hydrogels is carried out using different characterization techniques like FTIR & SEM. Other studies such as swelling studies and their physical properties like compression strength using UTM have also been evaluated. The blend hydrogels also exhibited the improved mechanical properties compared to those of homopolymers. The Carboxymethylated Guar Gum/Polyacrylamide blended hydrogels with the capacity of absorbing a high amount of water is also evaluated for its drug release profile at different pH. The drug used in this study was the ciprofloxacin hydrochloride. Release kinetics of ciprofloxacin hydrochloride from swollen polyacrylamide/carboxymethyl guargum cross-linked hydrogels in aqueous media have been successfully studied.

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Libri sul tema "GUAR GUM DERIVATIVES"

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Hongsheng, Yan, a cura di. Jin rong yan sheng jiao yu fa lü gui zhi ji fa lü feng xian guan li. Beijing Shi: Zhongguo ren min gong an da xue chu ban she, 2010.

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Capitoli di libri sul tema "GUAR GUM DERIVATIVES"

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Seeli, D. Sathya, e M. Prabaharan. "Guar Gum and Its Derivatives: Pharmaceutical Applications". In Natural Polymers for Pharmaceutical Applications, 115–38. Includes bibliographical references and indexes: Apple Academic Press, 2019. http://dx.doi.org/10.1201/9780429328251-5.

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Seeli, D. Sathya, e M. Prabaharan. "Prospects of Guar Gum and its Derivatives as Biomaterials". In Handbook of Polymers for Pharmaceutical Technologies, 413–31. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119041375.ch13.

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Abdel-raouf, Manar El-Sayed, Asmaa Sayed e Mai Mostafa. "Application of Guar Gum and Its Derivatives in Agriculture". In Reference Series in Phytochemistry, 117–32. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-91378-6_5.

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Abdel-raouf, Manar El-Sayed, Asmaa Sayed e Mai Mostafa. "Application of Guar Gum and Its Derivatives in Agriculture". In Reference Series in Phytochemistry, 1–17. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76523-1_5-1.

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Seeli, D., e M. Prabaharan. "Guar Gum and Its Derivatives: Versatile Materials for Controlled Drug Delivery". In Handbook of Sustainable Polymers, 261–87. Pan Stanford, 2016. http://dx.doi.org/10.1201/b19948-9.

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LAPASIN, R., e S. PRICL. "LONG-CHAIN HYDROPHOBIC DERIVATIVES OF HYDROXYPROPYL GUAR GUM (HPG): A RHEOLOGICAL STUDY IN SHEAR CONDITIONS". In Theoretical and Applied Rheology, 506. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89007-8.50217-3.

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Atti di convegni sul tema "GUAR GUM DERIVATIVES"

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"Modification of Fresh State Properties of Portland Cement-Based Mortars by Guar Gum Derivatives". In SP-302: Eleventh International Conference on Superplasticizers and Other Chemical Admixtures in Concrete. American Concrete Institute, 2015. http://dx.doi.org/10.14359/51688106.

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Siddiqui, Farhan, e Arezoo Emrani. "A Novel Green Friction Reducer That Helps to Achieve the Goals of ESG Standards". In SPE International Conference on Oilfield Chemistry. SPE, 2023. http://dx.doi.org/10.2118/213802-ms.

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Abstract Large volumes of treatment fluid are required to contact an adequate surface area of shale formations for the economic production of hydrocarbons. These large-volume fracturing treatments are accomplished by pumping at very high down-hole rates to create adequate fracture volume and for sufficient proppant transportation. Polyacrylamide-based friction reducers (FR) are implemented to minimize the friction in the wellbore in shale/tight reservoirs for stimulation and drilling processes. They reduce turbulence and decrease friction losses. However, these polyacrylamide-based friction reducers are limited by poor water quality tolerance, which negatively affects proppant carrying capacity. This work aims to introduce a novel formula for a green friction reducer, which will serve to both decrease costs and enhance retained conductivity. The new technology described in this paper is used to produce a friction reducer that helps to achieve the goals of Environmental, Social, and Governance (ESG) standards. Similar to guar gum, the new friction reducer can be utilized as a linear gel, or it can be crosslinked to enhance its viscosity, making it ideal for proppant transportation and the protection of surface equipment. It is worth noting that the presence of iron in water can have an adverse effect on the rheology and friction of both conventional and high viscosity friction reducers (HVFR). The research findings demonstrate the proposed product's effectiveness, even in water containing exceptionally high concentrations of ferric iron (Fe+3). The study presents the results of employing a new friction-reducing polysaccharide that achieves comparable friction reduction to that of a polyacrylamide friction reducer while also enabling proppant suspension, akin to a crosslinked guar system. This innovative system is versatile and can be used with both fresh and saline water with high concentration of divalent and trivalent metal ions. This feature allows the operator to use any water source, thereby streamlining water analysis procedures before commencing a frac job. Results also show that the new product can produce less nitrogen compared to synthetic polymers which means that it can achieve ESG standards. The novel FR gives excellent retained permeability on cores when compared to guar gum and its derivatives. Experimental outcomes of this work also show that the new formulation can be broken by both oxidizing and enzyme breakers. Results show that the new friction reducer is biodegradable and environmentally friendly. Moreover, the use of the novel product will decrease the production of CO2 as compared to conventional FRs.

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Karadkar, Prasad, Ataur Malik, Mohammed Alabdrabalnabi e Feng Liang. "Reduced Polymer Loaded Fracturing Fluid For Extreme Temperature Proppant Fracturing". In Gas & Oil Technology Showcase and Conference. SPE, 2023. http://dx.doi.org/10.2118/214192-ms.

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Abstract Guar gum and its derivatives based fracturing fluids are most commonly used in hydraulic fracturing. For high temperature wells, guar-based fracturing fluids need to be formulated with higher polymer loading and at high pH that leaves insoluble residue and tendency to form scales with divalent ions. In this paper, newly developed reduced polymer loaded fracturing fluids based acrylamide polymer was deployed from lab developments to field implementation. A thermally stable acrylamide-based polymer with a reduced polymer loading of 30-40% less than guar-based fracturing fluid was considered to minimize formation damage concerns. The crosslinked fracturing fluid viscosity was optimized at 340°F, bottomhole static temperature, and 315, 290, 265 and 240°F cooldown temperatures using a high pressure high temperature (HPHT) rheometer. For successful field deployment, a novel reduced polymer fracturing fluid was evaluated in the following sequence: chemical management, quality control, optimization of fracturing fluid formulations with field water, field mixing procedure, on-site QA/QC, data frac analysis and execution of main treatment. This paper presents rheological studies of reduced polymer loaded fracturing fluids at bottom hole static temperature (BHST) and cool down temperatures of selected well candidates that demonstrate the superior thermal stability of this novel fracturing fluid. With a polymer loading of 35 lb/1000 gal, the fluid viscosity stayed above 300 cP at 100 1/s shear rate for 60 min at 340°F. The fracturing fluid formulations were optimized using both live and encapsulated breakers using high pressure and high temperature rheometer. Due to the fast hydration of the base polymer, the linear gel was mixed on-the-flying during the main fracturing treatment. The main fracturing treatment was successfully executed with a 40 barrels per minute (bbl/min) pumping rate with increased proppant concentration up to 4.5 pounds per gallon (ppa) using 40/70 HSP (high strength proppant) proppant. The fracturing fluid system based on the novel acrylamide copolymer offers advantages over guar-based fracturing fluid such as low polymer loading, excellent high temperature stability and less formation damage. This paper presents a systematic approach and lessons learnt during novel fracturing fluid deployment.

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