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Showing 1 to 19 of 19 for “"Alginates"”.
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Chemical Modification of Alginates in Organic Media
Alginates are (1and4) linked linear copolysaccharides composed of B-D-mannuronic acid (M) and its C-5 epimer, a-L-guluronic acid (G). Several strategies to synthesize organically modified alginate derivatives have been reported, but almost all chemistries are performed in either aqueous or …
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Isopropyl alcohol to counteract effects of freezing on extended-storage alginates
… isopropyl alcohol (IA) on two extended-storage alginates. Impressions were made of a custom stainless steel model of known dimensions and stored for 96 hours at room and freezing temperatures with or without IA and then poured with Type IV gypsum. Impression and cast clinical acceptability were …
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Modified alginates as a matrix for gene transfection in a HeLa cell model
… results demonstrate the potential of modified alginates as vectors for gene delivery.</p>
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Investigation of liquid sodium alginates as mucoadhesive bandages coating the oesophageal mucosa and protecting it from gastric reflux
Gastro-oesophageal Reflux Disease (GORD), is generally caused by excess gastric reflux back to the oesophagus where damage to the mucosa results in injury. GORD is a very common disease in western countries, more than a quarter of western people are suffering from this disease and there is a trend …
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ΣΥΜΒΟΛΗ ΣΤΗ ΜΕΛΕΤΗ ΤΗΣ ΓΡΑΜΜΙΚΗΣ ΣΥΣΤΟΛΗΣ ΤΩΝ ΑΛΓΙΝΙΚΩΝ ΑΠΟΤΥΠΩΤΙΚΩΝ ΥΛΙΚΩΝ
… ALGINATE IMPRESSION MATERIALS. 17 HYDROCOLLOID ALGINATES, 3 SILICONISED ALGINATES AND VOCOLOIDWERE STUDIED. THE MEASUREMENTS WERE MADE WITH A LINEAR VERNIER MICROSCOPE CAPABLE OF MEASURING TO 0,01 MM THE INITIAL MEASUREMENT WAS MADE 10 MIN FROM THE START OF MIXING. FURTHER STUDIES WERE TAKEN AT …
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Over-expression and characterization of four alginate lyases from vibrio splendidus 12B01
… purified, and characterized the four PL7 alginates lyases. We found that these lyases have optimal activity between pH 7.5-8.5 and 20-25°C, consistent with use in a marine environment. Additionally, Ca 2+ is necessary for optimal enzyme activity. The binding constant (K m ) of the lyases …
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Characterization of pattern recognition receptor responses against materials for cell encapsulation
… of PRRs against several commercially available alginates. Here, we report that alginate compositions and material characteristics can influence which PRRs activate and how strongly they can provoke PRR mediated immune response, and that direct cell-to-material contact is a crucial step in …
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Development and Characterization of sustainable Materials from invasive brown Seaweed Ruguopteryx okamurae
… 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, with the aim of enhancing their rheological properties. Additionally, a life …
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Strategies to improve non-haem iron absorption
… should not rule out the potential use of alginates as a delivery system for iron, especially in diets containing high levels of phytate. Other related work reported in this thesis includes studies of iron availability from two wheat cultivars with varying phytate and iron concentrations, …
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Overcoming Diffusion Limitations in Encapsulated Cell Therapy for Type 1 Diabetes
… First, we explore the use of peptide-modified alginates to improve the function of diffusion advantageous dissociated islets. Next, we analyze the potential benefit of increasing vascularization at the surface of the alginate capsule. Although the islet must remain avascular to be protected …
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Design and fabrication of ceramic beads and laminated composites for the study of stress wave mitigation
… An exchange of ions takes place, where sodium alginates substitute their Na+ for Ca2+ ions to form semi-rigid bodies. Spherical ceramic beads using 50 wt% alumina suspension with 0.04 wt% polyacrylate dispersant are produced when: the viscosity of the slurry is below 0.3 Pa•s, the surface …
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Estudo ficoquímico e avaliação da atividade microbiológica de algas marinhas do gênero sargassum.
… in the literature, among which we can mention: alginates, florotaninos, coumarins, chromones, quinones, and terpenoids feoftinas . Studies have shown that metabolites produced by algae of the genus Sargass umtiveram biological activities, such as anticoagulant, antioxidant, analgesic and …
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A New Interfacial Cross Linking Technique: Preparation, Characterization and Evaluation of Calcium alginate Nanoparticles as a Protein Delivery System
… as proteins. In the presence of a divalent ion, alginates form bead like structures which can be used as carriers in drug delivery. The purpose of this research was to develop a new technique for synthesizing calcium alginate nanoparticles and to evaluate its potential as a protein delivery …
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Inter-Grade and Inter-Batch Variability of Pharmaceutical-Grade Sodium Alginate
… Heckel analysis. It was found that sodium alginates deform less plastically than microcrystalline cellulose (MCC PH102) but similar to lactose anhydrous. Sodium alginates also demonstrate more elastic deformations during compression than both MCC PH102 and lactose anhydrous. Compacts …
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The characterisation of alginate systems for biomedical applications
… on a range of polysaccharides, including sodium alginates (with varying mannuronic (M)/guluronic (G) acid ratio), pectin and sodium carboxymethylcellulose (CMC), for wound dressing applications. The samples were prepared as mixed salts such as sodium/calcium salts as Ca2+ ions are known to …
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Development of beverage model to test appetite control food ingredients : a thesis presented in partial fulfilment of the requirements for the degree of Master of Technology in Food Technology at Massey University, Palmerston North, New Zealand
… Based on the literature review, pectins and alginates appear to be more satiating than other viscous fibres. It is believed that gastric gelation can induce satiety, through the formation of a gel that has some strength (presumably in the stomach). Based on rheological measurements, Protanal® …
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A Comparison in Processing of Alginate Orthodontic Impressions by Commercial Labs
<p>Many orthodontists use commercial orthodontic laboratories for the processing of their impressions including preparation of the impression for pouring, model retrieval, final trim, and labeling. It was studied, by way of random sample survey, what materials and methods were most commonly …
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Encapsulation of probiotics envisaged for folate production in human intestine environment
… and capable to encapsulate probiotics. Different alginates were tested for probiotics protection and it was concluded that on the one hand alginate CR8223 would be fit as a more permeable microcapsule core, and on the other hand alginate CR8133 would be more suitable for an increased protection …
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3D bioprinting of pancreatic islets
… weniger streng aufgereinigten ('research-grade') Alginates adaptiert werden. Für die Charakterisierung der zellfreien Mischung wurden immer Vergleiche zwischen Pasten gezogen, die mit den beiden verschiedenen Alginaten hergestellt wurden. Die Stabilität wurde über rheologische Messungen und die …