Assembly properties and applications of a new exopolymeric compound excreted by Pseudoalteromonas antarctica NF3.

Assembly properties and applications of a new exopolymeric compound excreted by Pseudoalteromonas antarctica NF3. Research Abstract Details 

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Assembly properties and applications of a new exopolymeric compound excreted by Pseudoalteromonas antarctica NF3. Abstract Text:

M Cócera,O López,M Sabés,J L Parra,J Guinea,A de la Maza,

The self assembly properties and applications of an exopolymeric compound (EC) of a glycoprotein character excreted by a new gram-negative species, Pseudoalteromonas antarctica NF3, have been reviewed. This compound exhibited surface-active properties in water, with a concentration of 0.20 mg ml(-1) being the key value associated with its physicochemical properties. Unsonicated EC aqueous dispersions showed the coexistence of concentric multilamellar and small unilamellar aggregates by transmission electron microscopy (TEM). Sonication of these dispersions revealed that each lamellae of the initial multilamellar structures were made up of various subunits coiled coils. As for the ability of this exopolymeric biomaterial to coat phosphatidylcholine (PC) liposomes and to protect these vesicles against different surfactants, freeze-fracture TEM micrographs of liposome/EC aggregates revealed that the addition of the EC to liposomes led to the formation of a film (polymer adsorbed onto the bilayers) that coated very well the PC bilayers. The complete coating was already achieved at a PC:EC weight ratio of about 9:1. An increasing resistance of PC liposomes to surfactants (in particular sodium dodecyl sulfate) occurred as the proportion of EC in the system rose, although this effect was more effective at low EC proportions (PC:EC weight ratios from 9:1 to 8:2). Although a direct dependence was found between the growth of the enveloping structure and the resistance of the coated liposomes to be affected by the surfactants, the best protection occurred when this structure was a thin film of about 20-25 nm formed by nine to ten layers of about 2-3 nm.

Assembly properties and applications of a new exopolymeric compound excreted by Pseudoalteromonas antarctica NF3. Publishing Authors By Initials

M Cócera,O López,M Sabés,JL Parra,J Guinea,A de la Maza,

For similar chemical actions and uses: specialty uses of chemicals: surface-active agents research abstracts see: chemical actions and uses: specialty uses of chemicals: surface-active agents research

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Assembly properties and applications of a new exopolymeric compound excreted by Pseudoalteromonas antarctica NF3. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of biomaterials science. Polymer edition

VOLUME: 12

Page Numbers: 409-27

Journal Abbreviation:

ISSN: 0920-5063

DAY: 20

MONTH: 02

YEAR: 2001

Assembly properties and applications of a new exopolymeric compound excreted by Pseudoalteromonas antarctica NF3. Information

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LANGUAGE: eng

NlmUniqueID: 9007393

Assembly properties and applications of a new exopolymeric compound excreted by Pseudoalteromonas antarctica NF3. Keywords Mesh Terms:

KEYWORDS: Surface-Active Agents

MESH TERMS: chemistry

Chemical & Substance for Abstract: Assembly properties and applications of a new exopolymeric compound excreted by Pseudoalteromonas antarctica NF3. Information

Substance Name: Sodium Dodecyl Sulfate

Registry Number: 151-21-3

Grant and Affiliation Information for Assembly properties and applications of a new exopolymeric compound excreted by Pseudoalteromonas antarctica NF3.

AFFILIATION: Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Cientificas, Spain.

Country: Netherlands

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MEDLINETA: J Biomater Sci Polym Ed

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