Results 251 to 260 of about 1,103,313 (284)

Degradable alginate hydrogels crosslinked by the macromolecular crosslinker alginate dialdehyde

Journal of Materials Chemistry, 2012
Alginate dialdehyde (ADA) biopolymers possessing a degree of oxidation of either 10 or 50% (10-ADA and 50-ADA, respectively) were characterized using FTIR, XPS and SEC. The aldehyde vibrational mode at 1740 cm(-1) was observed only in ADA which had been equilibrated under ambient conditions while dry samples did not display this band. Spectral changes,
Jejurikar, Aparna, Seow, Xing Ting, Lawrie, Gwen, Martin, Darren, Jayakrishnan, Athipettah, Grøndahl, Lisbeth   +5 more
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Viscosity of degradated alginate using cellulase

AIP Conference Proceedings, 2020
Alginate consists of long chain polysaccharides, which has high molecular weight and viscosity. This high viscosity limits its use as a matrix in spray drying encapsulation. Hence, it needs viscosity modification. The viscosity of polysaccharides can be decreased by breaking the large molecule into smaller monomer.
Dyah H. Wardhani, Heri Cahyono, Hana N. Ulya, Aulia Rahmawati, Thio V. K. Sugiarto   +4 more
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Hydrolytically-degradable click-crosslinked alginate hydrogels

Biomaterials, 2018
Degradable biomaterials aim to recapitulate the dynamic microenvironment that cells are naturally exposed to. By oxidizing the alginate polymer backbone, thereby rendering it susceptible to hydrolysis, and crosslinking it via norbornene-tetrazine click chemistry, we can control rheological, mechanical, and degradation properties of resulting hydrogels.
Lueckgen, A., Garske, D., Ellinghaus, A., Desai, R., Stafford, A., Mooney, D., Duda, G., Cipitria, A. ; https://orcid.org/0000-0002-9918-1512   +7 more
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Isolation of an alginate-degrading organism and purification of its alginate lyase

Journal of Fermentation and Bioengineering, 1991
Abstract We isolated a bacterial strain, OS-ALG-9, which solubilized immobilized gel with calcium alginate in a reactor. It was identified as Pseudomonas sp. We studied the cultural conditions by using a 2.5- l jar fermentor and found that the growth and alginate-degrading enzyme production were optimal at pH 7.0 and 30°C.
Shinichi Kinoshita, Yasushi Kumoi, Atsumi Ohshima, Toshiomi Yoshida, Naoya Kasai   +4 more
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Enzymatic degradation of alginate by marine fungi

Hydrobiologia, 1990
A total of 72 pre-selected strains of 19 species of marine fungi were tested for their ability to decompose sodium alginate, calcium alginate or freshly prepared calcium alginate gel. Active alginate decomposition was evident in 18 strains (25% of total tested).
K. Schaumann, G. Weide
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Alginate Hydrogels with Tunable Degradation

Macromolecular Rapid Communications
ABSTRACT Hydrogels have found utility as both tissue scaffolds and cell delivery vehicles. As tissue engineering scaffolds, they provide physical and biochemical cues that guide tissue remodeling processes. Degradation of the gel over time is a desirable material property that allows for the complete integration ...
Haoyi Hou, Alison M. Lanzi, Yunpeng Feng, null Raavi, Arturo J. Vegas   +4 more
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Alkaline degradation of alginates to carboxylic acids

Carbohydrate Research, 1985
Abstract Various dicarboxylic acids related to saccharinic acids, as well as several monocarboxylic acids, formed on treatment of alginates with alkali at 95° and 135° have been identified by capillary g.l.c.-m.s. Higher concentrations of alkali facilitated the formation of glucoisosaccharinaric, anhydroisosaccharinaric, and 2-deoxy-3-C ...
Klaus Niemelä, Eero Sjöström
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Bacterial System for Alginate Uptake and Degradation

2009
Most alginate-assimilating bacteria secrete degrading enzymes, i.e., alginate lyases, into the extracellular fraction or periplasm, and incorporate the resultant alginate oligosaccharides through their cytoplasmic membrane. The Gram-negative bacterium Sphingomonas sp.
Wataru Hashimoto, Yukie Maruyama, Takafumi Itoh, Bunzo Mikami, Kousaku Murata   +4 more
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In vivo degradation of alginate in the presence and in the absence of resistant starch

Food Chemistry, 2015
This study evaluated the intestinal degradability of alginate during 74 days intake in pigs as models for humans. Diets contained pregelatinized starch, retrograded starch, alginate, or a mix of retrograded starch and alginate. Faeces were collected on day 1, 3, 7, 14, 39 and 74. Clear trends in intestinal alginate degradation were observed.
Jonathan, M.C., Souza Da Silva, C., Bosch, G., Schols, H.A., Gruppen, H.   +4 more
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Degradation of Alginate and Polymerization of Styrene Initiated by Alginate Macroradicals under Ultrasonic Irradiation

International Journal of Polymeric Materials and Polymeric Biomaterials, 2012
Ultrasonic irradiation is a promising method used for polymer degradation and polymerization. In this study, the degradation of alginate under ultrasonic irradiation was investigated. The macroradicals produced in the degradation process were used to initiate polymerization of styrene without adding any initiators and surfactants, and copolymers of ...
Hongwu Zhang, Yanbin Cai, Changping Zhu, Bo Huang, Bolong Yao, Caihua Ni   +5 more
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