Surface activity and emulsification properties of hydrophobically modified dextrans.
Identifieur interne : 000214 ( PubMed/Corpus ); précédent : 000213; suivant : 000215Surface activity and emulsification properties of hydrophobically modified dextrans.
Auteurs : C. Rouzes ; A. Durand ; M. Leonard ; E. DellacherieSource :
- Journal of colloid and interface science [ 0021-9797 ] ; 2002.
Abstract
Neutral polymeric surfactants were synthesized by covalent attachment of hydrophobic groups (aromatic rings) onto a polysaccharide backbone (dextran). By changing the conditions of the modification reaction, the number of grafted hydrophobic groups per 100 glucopyranose units (substitution ratio) was varied between 7 and 22. In aqueous solution, these polymers behaved like classical associative polymers as demonstrated by viscometric measurements. The associative behavior was more pronounced when the substitution ratio increased. The surface-active properties of the modified dextrans were evidenced by surface tension (air/water) and interfacial tension (dodecane/water) measurements. In each case the surface or interfacial tension leveled down above a critical polymer concentration, which was attributed to the formation of a dense polymer layer at the liquid-air or liquid-liquid interface. Dodecane-in-water emulsions were prepared using the polymeric surfactants as stabilizers, with oil volume fractions ranging between 5 and 20%. The oil droplet size (measured by dynamic light scattering) was correlated to the amount of polymer in the aqueous phase and to the volume of emulsified oil. The thickness of the adsorbed polymer layer was estimated thanks to zeta potential measurements coupled with size measurements. This thickness increased with the amount of polymer available for adsorption at the interface. The dextran-based surfactants were also applied to emulsion polymerization of styrene and stable polystyrene particles were obtained with a permanent adsorbed dextran layer at their surface. The comparison with the use of an unmodified dextran indicated that the polymeric surfactants were densely packed at the surface of the particles. The colloidal stability of the suspensions of polystyrene particles as well as their protection against protein adsorption (bovine serum albumin, BSA, used as a test protein) were also examined.
DOI: 10.1006/jcis.2002.8357
PubMed: 16290850
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Dellacherie</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2002">2002</date><idno type="doi">10.1006/jcis.2002.8357</idno><idno type="RBID">pubmed:16290850</idno><idno type="pmid">16290850</idno><idno type="wicri:Area/PubMed/Corpus">000214</idno><idno type="wicri:explorRef" wicri:stream="PubMed" wicri:step="Corpus" wicri:corpus="PubMed">000214</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Surface activity and emulsification properties of hydrophobically modified dextrans.</title><author><name sortKey="Rouzes, C" sort="Rouzes, C" uniqKey="Rouzes C" first="C" last="Rouzes">C. Rouzes</name><affiliation><nlm:affiliation>Laboratoire de Chimie Physique Macromoléculaire, UMR CNRS-INPL 7568, Groupe ENSIC, BP 451, Nancy Cedex 54001, France.</nlm:affiliation></affiliation></author><author><name sortKey="Durand, A" sort="Durand, A" uniqKey="Durand A" first="A" last="Durand">A. Durand</name></author><author><name sortKey="Leonard, M" sort="Leonard, M" uniqKey="Leonard M" first="M" last="Leonard">M. Leonard</name></author><author><name sortKey="Dellacherie, E" sort="Dellacherie, E" uniqKey="Dellacherie E" first="E" last="Dellacherie">E. Dellacherie</name></author></analytic><series><title level="j">Journal of colloid and interface science</title><idno type="ISSN">0021-9797</idno><imprint><date when="2002" type="published">2002</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Neutral polymeric surfactants were synthesized by covalent attachment of hydrophobic groups (aromatic rings) onto a polysaccharide backbone (dextran). By changing the conditions of the modification reaction, the number of grafted hydrophobic groups per 100 glucopyranose units (substitution ratio) was varied between 7 and 22. In aqueous solution, these polymers behaved like classical associative polymers as demonstrated by viscometric measurements. The associative behavior was more pronounced when the substitution ratio increased. The surface-active properties of the modified dextrans were evidenced by surface tension (air/water) and interfacial tension (dodecane/water) measurements. In each case the surface or interfacial tension leveled down above a critical polymer concentration, which was attributed to the formation of a dense polymer layer at the liquid-air or liquid-liquid interface. Dodecane-in-water emulsions were prepared using the polymeric surfactants as stabilizers, with oil volume fractions ranging between 5 and 20%. The oil droplet size (measured by dynamic light scattering) was correlated to the amount of polymer in the aqueous phase and to the volume of emulsified oil. The thickness of the adsorbed polymer layer was estimated thanks to zeta potential measurements coupled with size measurements. This thickness increased with the amount of polymer available for adsorption at the interface. The dextran-based surfactants were also applied to emulsion polymerization of styrene and stable polystyrene particles were obtained with a permanent adsorbed dextran layer at their surface. The comparison with the use of an unmodified dextran indicated that the polymeric surfactants were densely packed at the surface of the particles. The colloidal stability of the suspensions of polystyrene particles as well as their protection against protein adsorption (bovine serum albumin, BSA, used as a test protein) were also examined.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="PubMed-not-MEDLINE"><PMID Version="1">16290850</PMID><DateCreated><Year>2005</Year><Month>11</Month><Day>18</Day></DateCreated><DateCompleted><Year>2007</Year><Month>05</Month><Day>31</Day></DateCompleted><DateRevised><Year>2009</Year><Month>11</Month><Day>11</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0021-9797</ISSN><JournalIssue CitedMedium="Print"><Volume>253</Volume><Issue>1</Issue><PubDate><Year>2002</Year><Month>Sep</Month><Day>1</Day></PubDate></JournalIssue><Title>Journal of colloid and interface science</Title><ISOAbbreviation>J Colloid Interface Sci</ISOAbbreviation></Journal><ArticleTitle>Surface activity and emulsification properties of hydrophobically modified dextrans.</ArticleTitle><Pagination><MedlinePgn>217-23</MedlinePgn></Pagination><Abstract><AbstractText>Neutral polymeric surfactants were synthesized by covalent attachment of hydrophobic groups (aromatic rings) onto a polysaccharide backbone (dextran). By changing the conditions of the modification reaction, the number of grafted hydrophobic groups per 100 glucopyranose units (substitution ratio) was varied between 7 and 22. In aqueous solution, these polymers behaved like classical associative polymers as demonstrated by viscometric measurements. The associative behavior was more pronounced when the substitution ratio increased. The surface-active properties of the modified dextrans were evidenced by surface tension (air/water) and interfacial tension (dodecane/water) measurements. In each case the surface or interfacial tension leveled down above a critical polymer concentration, which was attributed to the formation of a dense polymer layer at the liquid-air or liquid-liquid interface. Dodecane-in-water emulsions were prepared using the polymeric surfactants as stabilizers, with oil volume fractions ranging between 5 and 20%. The oil droplet size (measured by dynamic light scattering) was correlated to the amount of polymer in the aqueous phase and to the volume of emulsified oil. The thickness of the adsorbed polymer layer was estimated thanks to zeta potential measurements coupled with size measurements. This thickness increased with the amount of polymer available for adsorption at the interface. The dextran-based surfactants were also applied to emulsion polymerization of styrene and stable polystyrene particles were obtained with a permanent adsorbed dextran layer at their surface. The comparison with the use of an unmodified dextran indicated that the polymeric surfactants were densely packed at the surface of the particles. The colloidal stability of the suspensions of polystyrene particles as well as their protection against protein adsorption (bovine serum albumin, BSA, used as a test protein) were also examined.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Rouzes</LastName><ForeName>C</ForeName><Initials>C</Initials><AffiliationInfo><Affiliation>Laboratoire de Chimie Physique Macromoléculaire, UMR CNRS-INPL 7568, Groupe ENSIC, BP 451, Nancy Cedex 54001, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Durand</LastName><ForeName>A</ForeName><Initials>A</Initials></Author><Author ValidYN="Y"><LastName>Leonard</LastName><ForeName>M</ForeName><Initials>M</Initials></Author><Author ValidYN="Y"><LastName>Dellacherie</LastName><ForeName>E</ForeName><Initials>E</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>J Colloid Interface Sci</MedlineTA><NlmUniqueID>0043125</NlmUniqueID><ISSNLinking>0021-9797</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2001</Year><Month>10</Month><Day>10</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2002</Year><Month>3</Month><Day>15</Day></PubMedPubDate><PubMedPubDate PubStatus="received"><Year>2001</Year><Month>10</Month><Day>10</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2002</Year><Month>3</Month><Day>15</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2005</Year><Month>11</Month><Day>18</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2005</Year><Month>11</Month><Day>18</Day><Hour>9</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2005</Year><Month>11</Month><Day>18</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pii">S0021-9797(02)98357-8</ArticleId><ArticleId IdType="doi">10.1006/jcis.2002.8357</ArticleId><ArticleId IdType="pubmed">16290850</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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