Neat DODAB vesicles: Effect of sonication time on the phase transition thermodynamic parameters and its relation with incomplete chain freezing
Vesicle solutions formed by the cationic lipid dioctadecyldimethylammonium bromide have been extensively used in the past 20 years as model membrane systems. Often, discrepancies are found in the literature for the thermodynamic parameters of the gel-to-liquid crystal (gel–lc) phase transition of th...
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| Veröffentlicht in: | Chemistry and physics of lipids 2005-10, Vol.137 (1), p.18-28 |
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| creator | Brito, R.O. Marques, E.F. |
| description | Vesicle solutions formed by the cationic lipid dioctadecyldimethylammonium bromide have been extensively used in the past 20 years as model membrane systems. Often, discrepancies are found in the literature for the thermodynamic parameters of the gel-to-liquid crystal (gel–lc) phase transition of these vesicles. In this work we present a systematic DSC investigation on the influence of the sonication method on the main temperature and enthalpy of the transition for DODAB vesicles, prepared both in normal and deuterated water. It is shown that as the sonication time increases, the
T
m and enthalpy values decrease until a plateau value is reached. This effect is associated with incomplete chain crystallization in the highly curved vesicles (produced by sonication) when they are cooled below the transition temperature. The effect of aging on the sonicated solutions has also been monitored by DSC. |
| doi_str_mv | 10.1016/j.chemphyslip.2005.05.001 |
| format | Article |
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T
m and enthalpy values decrease until a plateau value is reached. This effect is associated with incomplete chain crystallization in the highly curved vesicles (produced by sonication) when they are cooled below the transition temperature. The effect of aging on the sonicated solutions has also been monitored by DSC.</description><identifier>ISSN: 0009-3084</identifier><identifier>EISSN: 1873-2941</identifier><identifier>DOI: 10.1016/j.chemphyslip.2005.05.001</identifier><identifier>PMID: 16002059</identifier><language>eng</language><publisher>Ireland: Elsevier Ireland Ltd</publisher><subject>Calorimetry, Differential Scanning ; Dioctadecyldimethylammonium bromide ; DSC ; Liposomes ; Phase Transition ; Quaternary Ammonium Compounds - chemistry ; Solvents - chemistry ; Sonication ; Thermodynamics ; Transition Temperature ; Vesicle ; Viscosity ; Water - chemistry</subject><ispartof>Chemistry and physics of lipids, 2005-10, Vol.137 (1), p.18-28</ispartof><rights>2005 Elsevier Ireland Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c375t-4626a49a81a1558c489b2d97b5a7409d96d3bbaf1c5b949af6245d85e412d0d93</citedby><cites>FETCH-LOGICAL-c375t-4626a49a81a1558c489b2d97b5a7409d96d3bbaf1c5b949af6245d85e412d0d93</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.chemphyslip.2005.05.001$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,777,781,3537,27905,27906,45976</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/16002059$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Brito, R.O.</creatorcontrib><creatorcontrib>Marques, E.F.</creatorcontrib><title>Neat DODAB vesicles: Effect of sonication time on the phase transition thermodynamic parameters and its relation with incomplete chain freezing</title><title>Chemistry and physics of lipids</title><addtitle>Chem Phys Lipids</addtitle><description>Vesicle solutions formed by the cationic lipid dioctadecyldimethylammonium bromide have been extensively used in the past 20 years as model membrane systems. Often, discrepancies are found in the literature for the thermodynamic parameters of the gel-to-liquid crystal (gel–lc) phase transition of these vesicles. In this work we present a systematic DSC investigation on the influence of the sonication method on the main temperature and enthalpy of the transition for DODAB vesicles, prepared both in normal and deuterated water. It is shown that as the sonication time increases, the
T
m and enthalpy values decrease until a plateau value is reached. This effect is associated with incomplete chain crystallization in the highly curved vesicles (produced by sonication) when they are cooled below the transition temperature. The effect of aging on the sonicated solutions has also been monitored by DSC.</description><subject>Calorimetry, Differential Scanning</subject><subject>Dioctadecyldimethylammonium bromide</subject><subject>DSC</subject><subject>Liposomes</subject><subject>Phase Transition</subject><subject>Quaternary Ammonium Compounds - chemistry</subject><subject>Solvents - chemistry</subject><subject>Sonication</subject><subject>Thermodynamics</subject><subject>Transition Temperature</subject><subject>Vesicle</subject><subject>Viscosity</subject><subject>Water - chemistry</subject><issn>0009-3084</issn><issn>1873-2941</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkcFu1DAQhi0EotvCKyBz4ZbFTmxvzK1sW0Cq6AXOlmNPiFexHWxvq-UleGUSZSU4Io00Gs0382vmR-gtJVtKqHh_2JoB_DSc8uimbU0I3y5B6DO0oe2uqWrJ6HO0IYTIqiEtu0CXOR_mknBOX6ILKgipCZcb9Psr6IJvHm6uP-JHyM6MkD_g274HU3DscY7BGV1cDLg4D3jJA-Bp0BlwSTpktzYHSD7aU9DeGTzppD0USBnrYLErGScY1zVPrgzYBRP9NM4INoN2AfcJ4JcLP16hF70eM7w-5yv0_e722_5zdf_w6cv--r4yzY6XiolaaCZ1SzXlvDWslV1t5a7jeseItFLYput0Tw3v5Mz1ombcthwYrS2xsrlC79a9U4o_j5CL8i4bGEcdIB6zEq1gtRALKFfQpJhzgl5NyXmdTooStbihDuofN9TihlqC0Hn2zVnk2HmwfyfP75-B_QrAfOqjg6SycRAMWJdmA5SN7j9k_gD8OKRL</recordid><startdate>20051001</startdate><enddate>20051001</enddate><creator>Brito, R.O.</creator><creator>Marques, E.F.</creator><general>Elsevier Ireland Ltd</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20051001</creationdate><title>Neat DODAB vesicles: Effect of sonication time on the phase transition thermodynamic parameters and its relation with incomplete chain freezing</title><author>Brito, R.O. ; Marques, E.F.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c375t-4626a49a81a1558c489b2d97b5a7409d96d3bbaf1c5b949af6245d85e412d0d93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Calorimetry, Differential Scanning</topic><topic>Dioctadecyldimethylammonium bromide</topic><topic>DSC</topic><topic>Liposomes</topic><topic>Phase Transition</topic><topic>Quaternary Ammonium Compounds - chemistry</topic><topic>Solvents - chemistry</topic><topic>Sonication</topic><topic>Thermodynamics</topic><topic>Transition Temperature</topic><topic>Vesicle</topic><topic>Viscosity</topic><topic>Water - chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Brito, R.O.</creatorcontrib><creatorcontrib>Marques, E.F.</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Chemistry and physics of lipids</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Brito, R.O.</au><au>Marques, E.F.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Neat DODAB vesicles: Effect of sonication time on the phase transition thermodynamic parameters and its relation with incomplete chain freezing</atitle><jtitle>Chemistry and physics of lipids</jtitle><addtitle>Chem Phys Lipids</addtitle><date>2005-10-01</date><risdate>2005</risdate><volume>137</volume><issue>1</issue><spage>18</spage><epage>28</epage><pages>18-28</pages><issn>0009-3084</issn><eissn>1873-2941</eissn><abstract>Vesicle solutions formed by the cationic lipid dioctadecyldimethylammonium bromide have been extensively used in the past 20 years as model membrane systems. Often, discrepancies are found in the literature for the thermodynamic parameters of the gel-to-liquid crystal (gel–lc) phase transition of these vesicles. In this work we present a systematic DSC investigation on the influence of the sonication method on the main temperature and enthalpy of the transition for DODAB vesicles, prepared both in normal and deuterated water. It is shown that as the sonication time increases, the
T
m and enthalpy values decrease until a plateau value is reached. This effect is associated with incomplete chain crystallization in the highly curved vesicles (produced by sonication) when they are cooled below the transition temperature. The effect of aging on the sonicated solutions has also been monitored by DSC.</abstract><cop>Ireland</cop><pub>Elsevier Ireland Ltd</pub><pmid>16002059</pmid><doi>10.1016/j.chemphyslip.2005.05.001</doi><tpages>11</tpages></addata></record> |
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| ispartof | Chemistry and physics of lipids, 2005-10, Vol.137 (1), p.18-28 |
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| language | eng |
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| source | MEDLINE; Elsevier ScienceDirect Journals |
| subjects | Calorimetry, Differential Scanning Dioctadecyldimethylammonium bromide DSC Liposomes Phase Transition Quaternary Ammonium Compounds - chemistry Solvents - chemistry Sonication Thermodynamics Transition Temperature Vesicle Viscosity Water - chemistry |
| title | Neat DODAB vesicles: Effect of sonication time on the phase transition thermodynamic parameters and its relation with incomplete chain freezing |
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