Consulta: creatorFacets:"Weiss, Pierre"
Registros recuperados: 5
Data/hora: 09/06/2024 08:20:52

Design Polysaccharides of Marine Origin: Chemical Modifications to Reach Advanced Versatile Compounds
Provedor de dados: 5
Autores: Chopin, Nathalie; Guillory, Xavier; Weiss, Pierre; Le Bideau, Jean; Colliec-jouault, Sylvia.
Polysaccharides are among the most abundant macromolecules on Earth. These polymers are easily obtained from various marine resources such as algae, microorganisms and crustacean shells. The structure of these natural carbohydrates is innovative and quite complex. Marine biopolymers represent key scaffolds toward large challenging fields, such as biomedical applications (glycosaminoglycans, regenerative medicine and drug delivery) and tailored biomaterials. Chemical modifications can be applied to modify their final properties in a specific purpose. New functional glycans are achievable and represent a real potential with their intrinsic biocompatibility and biodegradability. Hydroxyl groups are ubiquitous in polysaccharides structure and involved in most...
Tipo: Text
Palavras-chave: Alginates; Carrageenans; Chemical modification; Chitin; Chitosan; Grafting; Marine polysaccharide; Polymer.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00199/31027/29902.pdf

Sterilization of Exopolysaccharides Produced by Deep-Sea Bacteria: Impact on Their Stability and Degradation
Provedor de dados: 5
Autores: Rederstorff, Emilie; Fatimi, Ahmed; Sinquin, Corinne; Ratiskol, Jacqueline; Merceron, Christophe; Vinatier, Claire; Weiss, Pierre; Colliec-jouault, Sylvia.
Polysaccharides are highly heat-sensitive macromolecules, so high temperature treatments are greatly destructive and cause considerable damage, such as a great decrease in both viscosity and molecular weight of the polymer. The technical feasibility of the production of exopolysaccharides by deep-sea bacteria Vibrio diabolicus and Alteromonas infernus was previously demonstrated using a bioproduct manufacturing process. The objective of this study was to determine which sterilization method, other than heat sterilization, was the most appropriate for these marine exopolysaccharides and was in accordance with bioprocess engineering requirements. Chemical sterilization using low-temperature ethylene oxide and a mixture of ionized gases (plasmas) was compared...
Tipo: Text
Palavras-chave: Marine biotechnology; Polysaccharides; Sterilization procedures; Characterization; Molecular weight distribution; Rheology.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00027/13776/10913.pdf

Pharmacological Modulation of Human Mesenchymal Stem Cell Chondrogenesis by a Chemically Oversulfated Polysaccharide of Marine Origin: Potential Application to Cartilage Regenerative Medicine
Provedor de dados: 5
Autores: Merceron, Christophe; Portron, Sophie; Vignes-colombeix, Caroline; Rederstorff, Emilie; Masson, Martial; Lesoeur, Julie; Sourice, Sophie; Sinquin, Corinne; Colliec-jouault, Sylvia; Weiss, Pierre; Vinatier, Claire; Guicheux, Jerome.
Mesenchymal stem cells (MSCs) are considered as an attractive source of cells for cartilage engineering due to their availability and capacity for expansion and multipotency. Differentiation of MSC into chondrocytes is crucial to successful cartilage regeneration and can be induced by various biological agents, including polysaccharides that participate in many biological processes through interactions with growth factors. Here, we hypothesize that growth factor-induced differentiation of MSC can be increased by chemically oversulfated marine polysaccharides. To test our hypothesis, human adipose tissue-derived MSCs (hATSCs) were cultured in pellets with transforming growth factor (TGF)-beta 1-supplemented chondrogenic medium containing either the...
Tipo: Text
Palavras-chave: Cartilage; Adipose-derived mesenchymal stem cells; Polysaccharides; Transforming growth factor-beta.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00071/18227/17457.pdf

An in vitro study of two GAG-like marine polysaccharides incorporated into injectable hydrogels for bone and cartilage tissue engineering
Provedor de dados: 5
Autores: Rederstorff, Emilie; Weiss, Pierre; Sourice, S.; Pilet, P.; Xie, F.; Sinquin, Corinne; Colliec-jouault, Sylvia; Guicheux, Jerome; Laib, S.
Natural polysaccharides are attractive compounds with which to build scaffolds for bone and cartilage tissue engineering. Here we tested two non-standard ones, HE800 and GY785, for the two-dimensional (2-D) and three-dimensional (3-D) culture of osteoblasts (MC3T3-E1) and chondrocytes (C28/I2). These two glycosaminoglycan-like marine exopolysaccharides were incorporated into an injectable silylated hydroxypropylmethylcellulose-based hydrogel (Si-HPMC) that has already shown its suitability for bone and cartilage tissue engineering. Results showed that, similarly to hyaluronic acid (HA) (the control), HE800 and GY785 significantly improved the mechanical properties of the Si-HPMC hydrogel and induced the attachment of MC3T3-E1 and C28/I2 cells when these...
Tipo: Text
Palavras-chave: Glycosaminoglycan; Hydrogel; Polysaccharide; Bone and cartilage tissue engineering; In vitro test.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00030/14090/15747.pdf

Purification of the exopolysaccharide produced by Alteromonas infernus: identification of endotoxins and effective process to remove them
Provedor de dados: 5
Autores: Grivaud-le Du, Alicia; Zykwinska, Agata; Sinquin, Corinne; Ratiskol, Jacqueline; Weiss, Pierre; Vinatier, Claire; Guicheux, Jerome; Delbarre-ladrat, Christine; Colliec-jouault, Sylvia.
Alteromonas infernus bacterium isolated from deep-sea hydrothermal vents can produce by fermentation a high molecular weight exopolysaccharide (EPS) called GY785. This EPS described as a new source of glycosaminoglycan-like molecule presents a great potential for pharmaceutical and biotechnological applications. However, this unusual EPS is secreted by a Gram-negative bacterium and can be therefore contaminated by endotoxins, in particular the lipopolysaccharides (LPS). Biochemical and chemical analyses of the LPS extracted from A. infernus membranes have shown the lack of the typical LPS architecture since 3-deoxy-d-manno-oct-2-ulopyranosonic acid (Kdo), glucosamine (GlcN), and phosphorylated monosaccharides were not present. Unlike for other...
Tipo: Text
Palavras-chave: Marine Alteromonas infernus; Bacterial exopolysaccharide; Endotoxin; Characterization; Purification; Fermentation; Process.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00397/50818/51601.pdf