Flexible film-type catalysts encapsulating urease within κ-carrageenan hydrogel network

Yamazaki, Sohei; Mori, Takeshi; Ogino, Isao; Mukai, Shin R.

doi:10.1016/j.cej.2014.11.097

Cited by 7 publications

(3 citation statements)

References 40 publications

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“…The graft copolymers of carrageenans have been synthesized extensively and used in many applications such as drug delivery and wastewater treatment. Carrageenan based hydrogels have mainly been used in drug delivery applications, but some of carrageenan hydrogels have also been used as adsorbents for impurities from wastewater . For example, a hydrogel nanocomposite of kappa ‐carrageenan, PVA, and Fe 3 O 4 magnetic nanoparticles as used for the adsorption of cationic dyes, e.g., crystal violet, from aqueous solutions .…”

Section: Structure and Properties Of Gum Polysaccharidesmentioning

confidence: 99%

Recent Progress on the Design and Applications of Polysaccharide‐Based Graft Copolymer Hydrogels as Adsorbents for Wastewater Purification

Mittal

Ray

Okamoto

2016

Macro Materials & Eng

131

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Gum polysaccharides are one of the most abundant bio‐based polymers. They are generally derived from plants as exudates or from microorganisms and have diverse applications in many industries, especially in the food industries where they are used as emulsifiers and thickeners. In their natural form, gum polysaccharides have poor mechanical and physical properties; therefore, they are frequently modified with various synthetic monomers such as acrylamide and acrylic acid using graft copolymerization. Graft copolymerization is one of the most trusted and widely used synthetic methods for the modification of gum polysaccharides. Gum polysaccharides modified in this way have improved mechanical and physicochemical properties. Furthermore, gum polysaccharides contain a variety of functional groups, for example, carboxylic acid and hydroxyl groups; therefore, they have been used extensively as adsorbents for the removal of different impurities from wastewater such as toxic heavy metal cations and synthetic dyes. Here, the chemical and physical properties of gum polysaccharides, different methods of graft copolymerization, and the use of graft copolymer gum‐polysaccharide‐based hydrogels are reviewed in detail for the removal of toxic heavy metal cations and synthetic dyes from aqueous solutions.

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Section: Structure and Properties Of Gum Polysaccharidesmentioning

confidence: 99%

Recent Progress on the Design and Applications of Polysaccharide‐Based Graft Copolymer Hydrogels as Adsorbents for Wastewater Purification

Mittal

Ray

Okamoto

2016

Macro Materials & Eng

131

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“…Much research on enzyme entrapment uses a κ-carrageenan as a wall material, such as for the entrapment of invertase [ 76 ], alpha-amylase [ 49 ], papain [ 50 ], urease [ 77 ], pancreatin [ 78 ], lactase [ 79 ], lipase [ 80 , 81 ], and glucoamylase [ 82 ].…”

Section: Most Used Polymers For Enzyme Encapsulationmentioning

confidence: 99%

Polymers as Encapsulating Agents and Delivery Vehicles of Enzymes

et al. 2021

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Enzymes are versatile biomolecules with broad applications. Since they are biological molecules, they can be easily destabilized when placed in adverse environmental conditions, such as variations in temperature, pH, or ionic strength. In this sense, the use of protective structures, as polymeric capsules, has been an excellent approach to maintain the catalytic stability of enzymes during their application. Thus, in this review, we report the use of polymeric materials as enzyme encapsulation agents, recent technological developments related to this subject, and characterization methodologies and possible applications of the formed bioactive structures. Our search detected that the most explored methods for enzyme encapsulation are ionotropic gelation, spray drying, freeze-drying, nanoprecipitation, and electrospinning. α-chymotrypsin, lysozyme, and β-galactosidase were the most used enzymes in encapsulations, with chitosan and sodium alginate being the main polymers. Furthermore, most studies reported high encapsulation efficiency, enzyme activity maintenance, and stability improvement at pH, temperature, and storage. Therefore, the information presented here shows a direction for the development of encapsulation systems capable of stabilizing different enzymes and obtaining better performance during application.

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“…For instance, it is known that carrageenan exhibits antioxidant and antimicrobial activity [ 1 , 2 , 3 , 4 , 5 ]. Furthermore, carrageenan finds potential use as a structural matrix in biomedical and catalytic applications [ 6 , 7 , 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Antioxidant and Antimicrobial Activities of Porphyran through Chemical Modification with Tyrosine Derivatives

et al. 2021

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The chemical modification of porphyran hydrocolloid is attempted, with the objective of enhancing its antioxidant and antimicrobial activities. Sulfated galactan porphyran is obtained from commercial samples of the red algae Porphyra dioica using Soxhlet extraction with water at 100 °C and precipitation with isopropyl alcohol. The extracted porphyran is then treated with modified L-tyrosines in aqueous medium in the presence of NaOH, at ca. 70 °C. The modified tyrosines L1 and L2 are prepared through a Mannich reaction with either thymol or 2,4-di-tert-butylphenol, respectively. While the reaction with 2,4-di-tert-butylphenol yields the expected tyrosine derivative, a mixture of products is obtained with thymol. The resulting polysaccharides are structurally characterized and the respective antioxidant and antimicrobial activities are determined. Porphyran treated with the N-(2-hydroxy-3,5-di-tert-butyl-benzyl)-L-tyrosine derivative, POR-L2, presents a noticeable superior radical scavenging and antioxidant activity compared to native porphyran, POR. Furthermore, it exhibited some antimicrobial activity against S. aureus. The surface morphology of films prepared by casting with native and modified porphyrans is studied by SEM/EDS. Both POR and POR-L2 present potential applicability in the production of films and washable coatings for food packaging with improved protecting characteristics.

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Flexible film-type catalysts encapsulating urease within κ-carrageenan hydrogel network

Cited by 7 publications

References 40 publications

Recent Progress on the Design and Applications of Polysaccharide‐Based Graft Copolymer Hydrogels as Adsorbents for Wastewater Purification

Recent Progress on the Design and Applications of Polysaccharide‐Based Graft Copolymer Hydrogels as Adsorbents for Wastewater Purification

Polymers as Encapsulating Agents and Delivery Vehicles of Enzymes

Enhancement of the Antioxidant and Antimicrobial Activities of Porphyran through Chemical Modification with Tyrosine Derivatives

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