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Showing 1 to 20 of 28 for “"calcium alginate"”.
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A New Interfacial Cross Linking Technique: Preparation, Characterization and Evaluation of Calcium alginate Nanoparticles as a Protein Delivery System
… the body, thereby making them safer for use. Alginate which is a polysaccharide polymer is particularly versatile in encapsulation of unstable and water soluble molecules such as proteins. In the presence of a divalent ion, alginates form bead like structures which can be used as carriers in …
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Preparation and Characterisation of Alginate Composite Beads and Investigations into their Potential Use in Environmental Applications
… research is concerned with the polymer sodium alginate, a naturally occurring biocompatible and biodegradable polysaccharide. The first objective was to prepare, characterise and monitor the release properties of a urease inhibitor (NBPT) from different calcium alginate hydrogel beads. Four …
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Inorganic Nanoparticle Nucleation on Polymer Matrices
… an elastin like peptide, cotton fabrics, and calcium alginate hydrogels. Various compositions of PAA were physically crosslinked with calcium alginate gels to design an antimicrobial hydrogel for use in wound dressing applications. PAA's ability to nucleate nanoparticles in a solid matrix was …
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Microbially influenced corrosion in sour environments
… iron sulfide film. Two model biogels were used: calcium alginate, which has this metal-binding property, and agarose, which does not. In pursuit of this hypothesis, iron sulfide films were grown on mild steel coupons. Two distinct forms of iron sulfides were grown: a loose black product at low …
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Fundamental phenomenological description and experimental optimization of gel stabilized biocatalysts in a two-phase system
The lipase from Candida rugosa is immobilized in calcium-alginate hydrogel before been placed in hexane in order to catalyse the esterification of butanol and propionic acid. The consequence of the acidification of the aqueous phase lead to the evolution of the calcium-alginate network to an …
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Evaluating strategies for integrating bacterial cells into a biosensor designed to detect electrophilic toxins
… efflux potential from immobilized cells: a calcium alginate, a photopolymer, and a thermally reversible gel. The calcium alginate was unstable, and dissolved after five days, such that the long-term impact of immobilization on the cells could not be determined in the matrix. The photopolymer …
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Fabrication of Micropatterned Hydrogels for Cell Culture
… hydrogels by sources. Agarose, Collagen and Calcium alginate are the most popular natural hydrogels. Polyethylene (glycol) and its derivative Polyethylene (glycol) Diacrylate (PEGDA) are indispensable synthetic hydrogels. In this thesis, hydrogels are studied for their chemical structure, …
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Production of lactic acid by microbial fermentation of hemicellulose sugars
… acetic acid. Immobilization of L. pentosus into calcium alginate beads was performed to increase cell density and reusability. Alginate-silica hybrid beads were prepared to improve the rigidity of the ordinary calcium alginate beads. The lactic acid yield was almost same as the ordinary alginate …
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Use Of Cryoprotectants, Prebiotics And Microencapsulation of Bacterial Cells in Improving the Viability of Probiotic Organisms in Freeze-Dried Yoghurt
… viability were possible. Microencapsulation with calciumalginate using the emulsion technique was found to improve the viability of the combined selected probiotic organisms by 0.31 log in freeze-dried yoghurt stored at 21C. Further studies were carried out to compare the extrusion technique with …
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Inter-Grade and Inter-Batch Variability of Pharmaceutical-Grade Sodium Alginate
… polymeric excipients. Sodium alginate, a widely used polymeric excipient, was selected for evaluation using appropriate analytical methods and test conditions, especially rheological methods. The materials used were six different grades of sodium alginate and an additional ten …
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Developing a single dressing containing both antifungal and antibacterial drugs for treating mixed infections in diabetic foot ulcers
… therefore aims to develop advanced bioactive calcium alginate-based dressings that will deliver therapeutically relevant doses of broad-spectrum antibiotic and antifungal drugs to target mixed infections in DFUs. The therapeutic calcium alginate (CA) based dressings were prepared as films and …
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An alginate hydrogel matrix for the localised delivery of a fibroblast/ keratinocyte co-culture to expedite wound healing
… was developed by encapsulation of fibroblasts in calcium-alginate hydrogel and culture of keratinocytes on the surface. Initially, the use of 5% and 2% w/v alginate hydrogels were investigated. Both scaffolds maintained fibroblast viability for at least 150 days encapsulation and caused reversible …
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Development and Characterization of sustainable Materials from invasive brown Seaweed Ruguopteryx okamurae
… focused on extracting and characterizing sodium alginate from the seaweed and comparing its properties with those of commercial alginates. Calcium alginate hydrogels were then produced, rheological properties were determined, and they were doped with polyphenols extracted from orange peel waste, …
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Development of an electronic aerosol atomisation system for generating three-dimensional (3D) cells in microencapsulations and microtissues characterisation
… atomisation system was proposed for producing calcium alginate microcapsules. The system was developed with the incorporation of a conventional syringe pump, a customised air pump and motor controller circuits. The microcapsules and 3D microtissues were biophysically characterised. For the …
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The potential of immobilied algal cell systems for the removal of mercury from aqueous solution
… was removed from medium and accumulated by alginate-immobilized and non-immobilized Clzlorella, a considerable amount of mercury was lost by volatilization. Inunobilized cells accumulated significantly more mercury than non-immobilized cells at higher inoculum densities, probably due to …
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Evaluating bacterial cell immobilization matrices for use in a biosensor
… efflux response. It has been immobilized in calcium alginate beads, photopolymer disks, and a thermally reversible gel in order to ultimately incorporate the immobilized system into a functional biosensor. The potassium efflux and cell viability were measured in the immobilized matrices. …
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Development of hydrogel tracer beads and comparative tracer tests to better understand contaminant fate and transport in karst systems
… tracer beads (HTBs), a non-toxic tracer made of calcium alginate (a derivative of marine algae), to better represent the behavior of NAPLs. The density of the HTBs can be readily modified to match different types of NAPLs. Sinking- and buoyant-HTBs were released during a preliminary field test at …
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Development of Polymeric Nanoparticles Containing a Natural Antioxidant (α-Tocopherol) for the Treatment of Spinal Cord Injury
… (α–TP) for delivery to the injured site in SCI. Calcium alginate NP (CA–NP) and poly lactic co–glycolic acid (PLGA) NP were prepared by ionotropic gelation and solvent evaporation technique to obtain a particle size (PS) of 21.9 ± 11.19 and 152.4 ± 10.6 nm, respectively and were characterized. An …
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Inducible Gene Expression in Cell Cultures and in Microencapsulated Cells
… in vivo</em> studies, we used biocompatible calcium alginate/poly-Llysine (PLL) beads to encapsulate cells, which may provide immune protection for cells during prolonged cellular transplantation. Using GFP as a marker, we monitored the growth and proliferation of encapsulated cells in …
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