Hydrogels based on a three component system with potential for leaching metals

Kandile, Nadia G.; Nasr, Abir S.

doi:10.1016/j.carbpol.2011.02.004

Cited by 28 publications

(10 citation statements)

References 43 publications

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“…2007). A wide variety of hydrogels can be made from other natural polymers such as starch and/or proteins (Kandile and Nasr 2011). …”

Section: Functionalized Foods Matrixmentioning

confidence: 99%

“…Hydrogels have several advantages over conventional emulsions, including protection against oxidation and targeted release inside the human body (McClements and Li 2010). Protein hydrogels can act as carriers for controlled release of bioactive molecules in flavor compounds and for minerals delivery; for example, microstructure gels were used to determine release profiles for iron (McClements and Li 2010; Kandile and Nasr 2011). Food‐grade nutraceuticals materials can be delivered through emulsion‐based particles entrapped in hydrogels (Graves and Weiss 1992); other delivery emulsion systems include liposomes, microemulsions and self‐assembled micelles from amphiphilic molecules, block copolymers, phospholipids and surfactants.…”

Section: Functionalized Foods Matrixmentioning

confidence: 99%

“…Whey protein concentrate hydrogels were shown to be stable in degradation experiments (Gunasekaran et al 2007). A wide variety of hydrogels can be made from other natural polymers such as starch and/or proteins (Kandile and Nasr 2011).…”

Section: Hydrogelsmentioning

confidence: 99%

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Microencapsulation and Functional Bioactive Foods

Onwulata

2012

Journal of Food Processing and Preservation

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In their active forms, the organic structures become the packaging units and carriers of nutrients intended for targeted delivery by nature, providing protection for the encapsulated active materials. This packaging and delivery role is mimicked in the microencapsulation process. One complex problem juxtaposes encapsulation effectiveness against accessibility and bioavailability of the entrapped nutrients; the others include providing nutrients that improve health and well‐being instead of drugs, and the daily use of the “whole” foods including the “active” components only to prevent future health problems. Presently, new foods and functions are being delivered through new technologies such as functional hydrogels, nanoemulsions and nanoparticles. Future foods such as nutraceuticals and pharmafoods may be delivered in forms that control the amounts of bioactives released at targeted organs. Nutrients may be delivered through foods tailored to individual genetic makeup (nutrigenomics), for an individual's metabolic needs, related to a specific element, metabolomics. PRACTICAL APPLICATIONS Microencapsulation mimics nature by packaging active components within structures that provide protection and delivers nutrients at appropriate sites. As such, it provides a benefit to bioactive functional food components by limiting the adverse food processing environment, which can be deleterious at times, such as the presence of water and oxygen. By controlling the structure matrix, the release time and dosage of bioactive contents are controlled for intentional site‐time delivery. This knowledge is leading the way bioactive components will be delivered for personal and body function and health‐enhancing benefits through functional foods.

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“…2007). A wide variety of hydrogels can be made from other natural polymers such as starch and/or proteins (Kandile and Nasr 2011). …”

Section: Functionalized Foods Matrixmentioning

confidence: 99%

Section: Functionalized Foods Matrixmentioning

confidence: 99%

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Microencapsulation and Functional Bioactive Foods

Onwulata

2012

Journal of Food Processing and Preservation

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“…Water molecules swell the polymer networks as they penetrate between the chains and breaks inter‐chain secondary valence bonds via the formation of hydrogen bonds with the various groups such as phosphoramide, phosphorester, and phosporthioester (for Gel‐2 ) within hydrogel matrix, and with hydroxyl, amine, and thiol (for Gel‐2 ) groups in the periphery of the hydrogels. The presence of these hydrophilic groups is known to increase the hydrophilicity of the system and, consequently, increase the equilibrium swelling values of the samples in aqueous mediums; this permits the polymer networks to expand to accommodate the influx of water via relaxation of the stresses produced by osmotic pressure.…”

Section: Resultsmentioning

confidence: 99%

Hexafunctional poly(propylene glycol) based hydrogels for the removal of heavy metal ions

Zheng

Shin

Song

et al. 2014

J of Applied Polymer Sci

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Two types of degradable poly(propylene glycol) (PPG) hydrogels that are suitable for the absorption of heavy metals have been presented. The PPG‐O‐P(O)Cl2 fragments obtained by treating hexafunctional PPG with phosphorous oxychloride (POCl3) react with 1,3‐propanediamine (PDA; Gel‐1) or PDA together with 1,2‐ethanedithiol (Gel‐2), to yield cross‐linked and water‐swellable hydrogels in a one‐pot method. This protocol for the fabrication of PPG hydrogels exhibits promising advantages over prior methods including a short reaction time, mass‐production, easy separation, and high yield. A series of heavy metal ions were employed to test the adsorptive properties of the hydrogels. Gel‐2 shows better adsorption capacity than Gel‐1 for all the metal ions and the metal ions adsorption efficiency of the two types of hydrogels is in the order of Fe(III) > Pb(II) > Cd(II) > Zn(II) > Cu(II) > Ni(II) > Co(II) > Hg(II). The amounts of metal ions adsorbed increases with metal ion concentration and hydrogel dosage, but decreases with temperature. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40610.

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“…The alkaline deacetylation of chitin produces a very useful material chitosan, which known as a copolymer of (1 → 4) linked 2-amino-2-deoxy-D-gluco-pyranose units, and also it is found naturally in some fungal cell walls. Since it is non-toxic and presents excellent biological properties such as biodegradation in the human body, immunological, antibacterial, and wound-healing activity [3] [4], as shown in (Scheme 1), chitosan has been widely used in food and pharmaceutical processes and in medical and agricultural drugs [5] [6] [7] [8] [9]. It can be found also in the skeleton of Open Journal of Organic Polymer Materials Scheme 1.…”

Section: Introductionmentioning

confidence: 99%

Extraction and Characterization of Chitosan from Shrimp Shells (Egypt : case study)

Saleh

Nasr

Zaki

et al. 2016

Journal of Scientific Research in Science

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Chitosan is one of the most studied polysaccharides nowadays. Because it is non-toxic, widely used in food, pharmaceutical processes, agricultural, and presents excellent biological properties such as biodegradation in the human body, and antibacterial. In the present study we reported the extraction of low cost chitosans (Cs1, Cs2, Cs3 and Cs4) from shrimp shells by extraction of chitin (Egypt: case study), then alkaline deacetylation of chitin with strong alkaline solution at different period of time. The different prepared chitosans (Cs1, Cs2, Cs3 and Cs4) were characterized by FTIR spectroscopy, thermal stability, morphology, crystallography, elemental analysis and degree of deacetylation. The data showed that the prepared chitosan Cs2 has the most thermal stability and the highest degree of deacetylation.

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Hydrogels based on a three component system with potential for leaching metals

Cited by 28 publications

References 43 publications

Microencapsulation and Functional Bioactive Foods

Microencapsulation and Functional Bioactive Foods

Hexafunctional poly(propylene glycol) based hydrogels for the removal of heavy metal ions

Extraction and Characterization of Chitosan from Shrimp Shells (Egypt : case study)

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