Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin
Identifieur interne : 000522 ( Istex/Corpus ); précédent : 000521; suivant : 000523Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin
Auteurs : M. Kellens ; W. Meeussen ; R. Gehrke ; H. ReynaersSource :
- Chemistry and Physics of Lipids [ 0009-3084 ] ; 1991.
English descriptors
- Teeft :
- Angle diffraction pattern, Behaviour, Bilayer structure, Broad reflection, Catholic university, Chem, Complete crystallization, Cooling step, Crystal defects, Crystal growth process, Crystal perfection, Crystal structure, Crystalline order, Crystallization, Crystallization process, Crystallization temperature, Detectable amount, Detector distance, Different polymorphic forms, Differential scanning calorimetry, Diffraction, Diffraction angle, Diffraction measurements, Diffraction pattern, Diffraction patterns, Diffraction results, Diffraction spectra, Exothermic peaks, Exothermic processes, Experimental setup, Group planes, Heating process, Heating rate, High crystallization rate, Higher angle, Highest intensity, Isothermal crystallization, Isothermal crystallization processes, Kinetically favoured, Lamellar arrangement, Large tendency, Layer thickness, Long spacing, Longest spacing, Maximum intensity, Microscopic studies, Nucleation, Phase transition processes, Phase transitions, Polymorphic, Polymorphic behaviour, Polymorphic transitions, Present data, Publishers ireland, Rapid recrystallization, Recrystallization, Recrystallization process, Room temperature, Same rate, Sample holder, Simple rearrangement, Slower kinetics, Small angle, Small angle region, Small endotherm, Structural changes, Synchrotron, Synchrotron radiation, Synchrotron radiation data, Triglyceride, Triglyceride composition, Triglyceride molecules, Tripalmitin, Tristearin, Typical angle diffraction pattern, Upper part, Wide angle diffraction data, Wide angle diffraction patterns, Wide angle region.
Abstract
Abstract: Time-resolved X-ray diffraction studies of the polymorphic behaviour of tripalmitin and tristearin during crystallization and melting, have been performed using synchrotron radiation in combination with DSC. Both triglycerides show a large tendency towards β-crystallization. Upon melting the α-phase, recrystallization to β occurs very quickly. The present data do not indicate the intervention of a detectable amount of β′-form during the transformation of α to β. The β′-form can be crystallized from the α-melt without the intervention of the β′-form. No indications are found to support the existence of a liquid-crystalline structure in the α-melt: the slower recrystallization to β, the more isotropic the melt. The α-β transition cannot be described as a simple rearrangement of the molecules, but seems to involve a nucleation and crystal growth process. The high crystallization rate of β from the α-melt as compared to a β-crystallization from the isotropic melt, mainly results from the much faster nucleation, the latter being accelerated by the persistence of crystallites in the α-melt. Melting of the β-form involves a simultaneous increase in disorder in the lateral direction (in the a—b-plane) and along the c-axis of the crystal cell (lamellar arrangement). The present data do not support the persistence of a bilayer structure in the melt above the β-melting temperature. The β′-form of tripalmitin and tristearin can only be obtained from the isotropic melt and is characterized by a typical β′2-wide angle X-ray diffraction pattern. The two endotherms, appearing in the DSC-thermogram upon melting β′2, cannot be correlated with two independent β′-subforms (β′2 and β′1). Crystal perfection and crystallinity of the β′-form is considerably influenced by the crystallization conditions.
Url:
DOI: 10.1016/0009-3084(91)90119-V
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ISTEX:FBBC58A16CBBDC9A2A335E4FF6D4204C53485D8FLe document en format XML
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Part 1: Tripalmitin and tristearin</title><author><name sortKey="Kellens, M" sort="Kellens, M" uniqKey="Kellens M" first="M." last="Kellens">M. Kellens</name><affiliation><mods:affiliation>Laboratory of Macromolecular Structural Chemistry, Catholic University of Leuven Belgium</mods:affiliation></affiliation><affiliation><mods:affiliation>n.v. Vandemoortele Coördination Center, R&D Dept., Izegem Belgium</mods:affiliation></affiliation></author><author><name sortKey="Meeussen, W" sort="Meeussen, W" uniqKey="Meeussen W" first="W." last="Meeussen">W. Meeussen</name><affiliation><mods:affiliation>n.v. Vandemoortele Coördination Center, R&D Dept., Izegem Belgium</mods:affiliation></affiliation></author><author><name sortKey="Gehrke, R" sort="Gehrke, R" uniqKey="Gehrke R" first="R." last="Gehrke">R. Gehrke</name><affiliation><mods:affiliation>Deutsches Elektronen-Synchrotron (DESY), Hamburg Germany</mods:affiliation></affiliation></author><author><name sortKey="Reynaers, H" sort="Reynaers, H" uniqKey="Reynaers H" first="H." last="Reynaers">H. Reynaers</name><affiliation><mods:affiliation>Correspondence to: H. Reynaers, Laboratory of Macromolecular Structural Chemistry, Department of Chemistry, Catholic University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium.</mods:affiliation></affiliation><affiliation><mods:affiliation>Laboratory of Macromolecular Structural Chemistry, Catholic University of Leuven Belgium</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Chemistry and Physics of Lipids</title><title level="j" type="abbrev">CPL</title><idno type="ISSN">0009-3084</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1991">1991</date><biblScope unit="volume">58</biblScope><biblScope unit="issue">1–2</biblScope><biblScope unit="page" from="131">131</biblScope><biblScope unit="page" to="144">144</biblScope></imprint><idno type="ISSN">0009-3084</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0009-3084</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="Teeft" xml:lang="en"><term>Angle diffraction pattern</term><term>Behaviour</term><term>Bilayer structure</term><term>Broad reflection</term><term>Catholic university</term><term>Chem</term><term>Complete crystallization</term><term>Cooling step</term><term>Crystal defects</term><term>Crystal growth process</term><term>Crystal perfection</term><term>Crystal structure</term><term>Crystalline order</term><term>Crystallization</term><term>Crystallization process</term><term>Crystallization temperature</term><term>Detectable amount</term><term>Detector distance</term><term>Different polymorphic forms</term><term>Differential scanning calorimetry</term><term>Diffraction</term><term>Diffraction angle</term><term>Diffraction measurements</term><term>Diffraction pattern</term><term>Diffraction patterns</term><term>Diffraction results</term><term>Diffraction spectra</term><term>Exothermic peaks</term><term>Exothermic processes</term><term>Experimental setup</term><term>Group planes</term><term>Heating process</term><term>Heating rate</term><term>High crystallization rate</term><term>Higher angle</term><term>Highest intensity</term><term>Isothermal crystallization</term><term>Isothermal crystallization processes</term><term>Kinetically favoured</term><term>Lamellar arrangement</term><term>Large tendency</term><term>Layer thickness</term><term>Long spacing</term><term>Longest spacing</term><term>Maximum intensity</term><term>Microscopic studies</term><term>Nucleation</term><term>Phase transition processes</term><term>Phase transitions</term><term>Polymorphic</term><term>Polymorphic behaviour</term><term>Polymorphic transitions</term><term>Present data</term><term>Publishers ireland</term><term>Rapid recrystallization</term><term>Recrystallization</term><term>Recrystallization process</term><term>Room temperature</term><term>Same rate</term><term>Sample holder</term><term>Simple rearrangement</term><term>Slower kinetics</term><term>Small angle</term><term>Small angle region</term><term>Small endotherm</term><term>Structural changes</term><term>Synchrotron</term><term>Synchrotron radiation</term><term>Synchrotron radiation data</term><term>Triglyceride</term><term>Triglyceride composition</term><term>Triglyceride molecules</term><term>Tripalmitin</term><term>Tristearin</term><term>Typical angle diffraction pattern</term><term>Upper part</term><term>Wide angle diffraction data</term><term>Wide angle diffraction patterns</term><term>Wide angle region</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Time-resolved X-ray diffraction studies of the polymorphic behaviour of tripalmitin and tristearin during crystallization and melting, have been performed using synchrotron radiation in combination with DSC. Both triglycerides show a large tendency towards β-crystallization. Upon melting the α-phase, recrystallization to β occurs very quickly. The present data do not indicate the intervention of a detectable amount of β′-form during the transformation of α to β. The β′-form can be crystallized from the α-melt without the intervention of the β′-form. No indications are found to support the existence of a liquid-crystalline structure in the α-melt: the slower recrystallization to β, the more isotropic the melt. The α-β transition cannot be described as a simple rearrangement of the molecules, but seems to involve a nucleation and crystal growth process. The high crystallization rate of β from the α-melt as compared to a β-crystallization from the isotropic melt, mainly results from the much faster nucleation, the latter being accelerated by the persistence of crystallites in the α-melt. Melting of the β-form involves a simultaneous increase in disorder in the lateral direction (in the a—b-plane) and along the c-axis of the crystal cell (lamellar arrangement). The present data do not support the persistence of a bilayer structure in the melt above the β-melting temperature. The β′-form of tripalmitin and tristearin can only be obtained from the isotropic melt and is characterized by a typical β′2-wide angle X-ray diffraction pattern. The two endotherms, appearing in the DSC-thermogram upon melting β′2, cannot be correlated with two independent β′-subforms (β′2 and β′1). Crystal perfection and crystallinity of the β′-form is considerably influenced by the crystallization conditions.</div></front></TEI><istex><corpusName>elsevier</corpusName><keywords><teeft><json:string>tripalmitin</json:string><json:string>synchrotron</json:string><json:string>tristearin</json:string><json:string>triglyceride</json:string><json:string>recrystallization</json:string><json:string>chem</json:string><json:string>polymorphic</json:string><json:string>diffraction angle</json:string><json:string>synchrotron radiation</json:string><json:string>crystallization</json:string><json:string>nucleation</json:string><json:string>diffraction patterns</json:string><json:string>long spacing</json:string><json:string>wide angle diffraction data</json:string><json:string>small angle</json:string><json:string>crystal perfection</json:string><json:string>synchrotron radiation data</json:string><json:string>small angle region</json:string><json:string>present data</json:string><json:string>diffraction</json:string><json:string>small endotherm</json:string><json:string>maximum intensity</json:string><json:string>bilayer structure</json:string><json:string>angle diffraction pattern</json:string><json:string>polymorphic behaviour</json:string><json:string>cooling step</json:string><json:string>crystal structure</json:string><json:string>complete crystallization</json:string><json:string>higher angle</json:string><json:string>crystallization temperature</json:string><json:string>different polymorphic forms</json:string><json:string>catholic university</json:string><json:string>crystal defects</json:string><json:string>exothermic peaks</json:string><json:string>room temperature</json:string><json:string>detector distance</json:string><json:string>diffraction spectra</json:string><json:string>isothermal crystallization processes</json:string><json:string>heating rate</json:string><json:string>phase transition processes</json:string><json:string>crystallization process</json:string><json:string>same rate</json:string><json:string>exothermic processes</json:string><json:string>triglyceride composition</json:string><json:string>wide angle region</json:string><json:string>layer thickness</json:string><json:string>longest spacing</json:string><json:string>group planes</json:string><json:string>rapid recrystallization</json:string><json:string>differential scanning calorimetry</json:string><json:string>recrystallization process</json:string><json:string>lamellar arrangement</json:string><json:string>high crystallization rate</json:string><json:string>upper part</json:string><json:string>highest intensity</json:string><json:string>crystalline order</json:string><json:string>diffraction measurements</json:string><json:string>diffraction pattern</json:string><json:string>crystal growth process</json:string><json:string>simple rearrangement</json:string><json:string>detectable amount</json:string><json:string>large tendency</json:string><json:string>wide angle diffraction patterns</json:string><json:string>heating process</json:string><json:string>diffraction results</json:string><json:string>experimental setup</json:string><json:string>sample holder</json:string><json:string>microscopic studies</json:string><json:string>polymorphic transitions</json:string><json:string>structural changes</json:string><json:string>phase transitions</json:string><json:string>isothermal crystallization</json:string><json:string>broad reflection</json:string><json:string>slower kinetics</json:string><json:string>triglyceride molecules</json:string><json:string>kinetically favoured</json:string><json:string>typical angle diffraction pattern</json:string><json:string>publishers ireland</json:string><json:string>behaviour</json:string></teeft></keywords><author><json:item><name>M. Kellens</name><affiliations><json:string>Laboratory of Macromolecular Structural Chemistry, Catholic University of Leuven Belgium</json:string><json:string>n.v. Vandemoortele Coördination Center, R&D Dept., Izegem Belgium</json:string></affiliations></json:item><json:item><name>W. Meeussen</name><affiliations><json:string>n.v. Vandemoortele Coördination Center, R&D Dept., Izegem Belgium</json:string></affiliations></json:item><json:item><name>R. Gehrke</name><affiliations><json:string>Deutsches Elektronen-Synchrotron (DESY), Hamburg Germany</json:string></affiliations></json:item><json:item><name>H. Reynaers</name><affiliations><json:string>Correspondence to: H. Reynaers, Laboratory of Macromolecular Structural Chemistry, Department of Chemistry, Catholic University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium.</json:string><json:string>Laboratory of Macromolecular Structural Chemistry, Catholic University of Leuven Belgium</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>triglycerides</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>polymorphism</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>tripalmitin</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>tristearin</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>melting behaviour, synchrotron radiation</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>differential scanning calorimetry (DSC)</value></json:item></subject><arkIstex>ark:/67375/6H6-S37V4CN4-6</arkIstex><language><json:string>eng</json:string></language><originalGenre><json:string>Full-length article</json:string></originalGenre><abstract>Abstract: Time-resolved X-ray diffraction studies of the polymorphic behaviour of tripalmitin and tristearin during crystallization and melting, have been performed using synchrotron radiation in combination with DSC. Both triglycerides show a large tendency towards β-crystallization. Upon melting the α-phase, recrystallization to β occurs very quickly. The present data do not indicate the intervention of a detectable amount of β′-form during the transformation of α to β. The β′-form can be crystallized from the α-melt without the intervention of the β′-form. No indications are found to support the existence of a liquid-crystalline structure in the α-melt: the slower recrystallization to β, the more isotropic the melt. The α-β transition cannot be described as a simple rearrangement of the molecules, but seems to involve a nucleation and crystal growth process. The high crystallization rate of β from the α-melt as compared to a β-crystallization from the isotropic melt, mainly results from the much faster nucleation, the latter being accelerated by the persistence of crystallites in the α-melt. Melting of the β-form involves a simultaneous increase in disorder in the lateral direction (in the a—b-plane) and along the c-axis of the crystal cell (lamellar arrangement). The present data do not support the persistence of a bilayer structure in the melt above the β-melting temperature. The β′-form of tripalmitin and tristearin can only be obtained from the isotropic melt and is characterized by a typical β′2-wide angle X-ray diffraction pattern. The two endotherms, appearing in the DSC-thermogram upon melting β′2, cannot be correlated with two independent β′-subforms (β′2 and β′1). Crystal perfection and crystallinity of the β′-form is considerably influenced by the crystallization conditions.</abstract><qualityIndicators><refBibsNative>true</refBibsNative><abstractWordCount>270</abstractWordCount><abstractCharCount>1819</abstractCharCount><keywordCount>6</keywordCount><score>10</score><pdfWordCount>5812</pdfWordCount><pdfCharCount>33994</pdfCharCount><pdfVersion>1.4</pdfVersion><pdfPageCount>14</pdfPageCount><pdfPageSize>540 x 735 pts</pdfPageSize></qualityIndicators><title>Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin</title><pii><json:string>0009-3084(91)90119-V</json:string></pii><genre><json:string>research-article</json:string></genre><host><title>Chemistry and Physics of Lipids</title><language><json:string>unknown</json:string></language><publicationDate>1991</publicationDate><issn><json:string>0009-3084</json:string></issn><pii><json:string>S0009-3084(00)X0256-3</json:string></pii><volume>58</volume><issue>1–2</issue><pages><first>131</first><last>144</last></pages><genre><json:string>journal</json:string></genre></host><namedEntities><unitex><date><json:string>1991</json:string></date><geogName></geogName><orgName><json:string>Vandemoorteh, Co</json:string><json:string>University of Hamburg</json:string><json:string>Catholic University</json:string><json:string>Laboratory of Macromolecular Structural Chemistry, Department of Chemistry, Catholic University of Leuven, Celestijnenlaan</json:string></orgName><orgName_funder></orgName_funder><orgName_provider></orgName_provider><persName><json:string>C. Riekel</json:string><json:string>H. Zachmann</json:string><json:string>A. Hammersley</json:string></persName><placeName><json:string>Germany</json:string><json:string>Hamburg</json:string><json:string>Leuven</json:string><json:string>Belgium</json:string></placeName><ref_url></ref_url><ref_bibl><json:string>[9,10,17]</json:string><json:string>accepted March 12th, 1991</json:string><json:string>Received December 7th, 1990</json:string><json:string>[7,18]</json:string><json:string>[10]</json:string><json:string>[16]</json:string><json:string>[3]</json:string><json:string>[15]</json:string><json:string>[12,13]</json:string><json:string>[7]</json:string><json:string>[25]</json:string><json:string>[10,15]</json:string><json:string>[9]</json:string><json:string>[1,2]</json:string><json:string>[13]</json:string><json:string>[2,7,8]</json:string><json:string>revision received March 7th, 1991</json:string><json:string>[19]</json:string></ref_bibl><bibl></bibl></unitex></namedEntities><ark><json:string>ark:/67375/6H6-S37V4CN4-6</json:string></ark><categories><wos><json:string>1 - science</json:string><json:string>2 - biophysics</json:string><json:string>2 - biochemistry & molecular biology</json:string></wos><scienceMetrix><json:string>1 - health sciences</json:string><json:string>2 - biomedical research</json:string><json:string>3 - biophysics</json:string></scienceMetrix><scopus><json:string>1 - Life Sciences</json:string><json:string>2 - Biochemistry, Genetics and Molecular Biology</json:string><json:string>3 - Cell Biology</json:string><json:string>1 - Physical Sciences</json:string><json:string>2 - Chemistry</json:string><json:string>3 - Organic Chemistry</json:string><json:string>1 - Life Sciences</json:string><json:string>2 - Biochemistry, Genetics and Molecular Biology</json:string><json:string>3 - Molecular Biology</json:string><json:string>1 - Life Sciences</json:string><json:string>2 - Biochemistry, Genetics and Molecular Biology</json:string><json:string>3 - Biochemistry</json:string></scopus><inist><json:string>1 - sciences appliquees, technologies et medecines</json:string><json:string>2 - sciences biologiques et medicales</json:string><json:string>3 - sciences biologiques fondamentales et appliquees. psychologie</json:string><json:string>4 - industries agroalimentaires</json:string></inist></categories><publicationDate>1991</publicationDate><copyrightDate>1991</copyrightDate><doi><json:string>10.1016/0009-3084(91)90119-V</json:string></doi><id>FBBC58A16CBBDC9A2A335E4FF6D4204C53485D8F</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/ark:/67375/6H6-S37V4CN4-6/fulltext.pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/ark:/67375/6H6-S37V4CN4-6/bundle.zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/ark:/67375/6H6-S37V4CN4-6/fulltext.tei"><teiHeader><fileDesc><titleStmt><title level="a">Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>ELSEVIER</p></availability><date>1991</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin</title><author xml:id="author-0000"><persName><forename type="first">M.</forename><surname>Kellens</surname></persName><affiliation>Laboratory of Macromolecular Structural Chemistry, Catholic University of Leuven Belgium</affiliation><affiliation>n.v. Vandemoortele Coördination Center, R&D Dept., Izegem Belgium</affiliation></author><author xml:id="author-0001"><persName><forename type="first">W.</forename><surname>Meeussen</surname></persName><affiliation>n.v. Vandemoortele Coördination Center, R&D Dept., Izegem Belgium</affiliation></author><author xml:id="author-0002"><persName><forename type="first">R.</forename><surname>Gehrke</surname></persName><affiliation>Deutsches Elektronen-Synchrotron (DESY), Hamburg Germany</affiliation></author><author xml:id="author-0003"><persName><forename type="first">H.</forename><surname>Reynaers</surname></persName><affiliation>Correspondence to: H. Reynaers, Laboratory of Macromolecular Structural Chemistry, Department of Chemistry, Catholic University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium.</affiliation><affiliation>Laboratory of Macromolecular Structural Chemistry, Catholic University of Leuven Belgium</affiliation></author><idno type="istex">FBBC58A16CBBDC9A2A335E4FF6D4204C53485D8F</idno><idno type="DOI">10.1016/0009-3084(91)90119-V</idno><idno type="PII">0009-3084(91)90119-V</idno></analytic><monogr><title level="j">Chemistry and Physics of Lipids</title><title level="j" type="abbrev">CPL</title><idno type="pISSN">0009-3084</idno><idno type="PII">S0009-3084(00)X0256-3</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1991"></date><biblScope unit="volume">58</biblScope><biblScope unit="issue">1–2</biblScope><biblScope unit="page" from="131">131</biblScope><biblScope unit="page" to="144">144</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1991</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Time-resolved X-ray diffraction studies of the polymorphic behaviour of tripalmitin and tristearin during crystallization and melting, have been performed using synchrotron radiation in combination with DSC. Both triglycerides show a large tendency towards β-crystallization. Upon melting the α-phase, recrystallization to β occurs very quickly. The present data do not indicate the intervention of a detectable amount of β′-form during the transformation of α to β. The β′-form can be crystallized from the α-melt without the intervention of the β′-form. No indications are found to support the existence of a liquid-crystalline structure in the α-melt: the slower recrystallization to β, the more isotropic the melt. The α-β transition cannot be described as a simple rearrangement of the molecules, but seems to involve a nucleation and crystal growth process. The high crystallization rate of β from the α-melt as compared to a β-crystallization from the isotropic melt, mainly results from the much faster nucleation, the latter being accelerated by the persistence of crystallites in the α-melt. Melting of the β-form involves a simultaneous increase in disorder in the lateral direction (in the a—b-plane) and along the c-axis of the crystal cell (lamellar arrangement). The present data do not support the persistence of a bilayer structure in the melt above the β-melting temperature. The β′-form of tripalmitin and tristearin can only be obtained from the isotropic melt and is characterized by a typical β′2-wide angle X-ray diffraction pattern. The two endotherms, appearing in the DSC-thermogram upon melting β′2, cannot be correlated with two independent β′-subforms (β′2 and β′1). Crystal perfection and crystallinity of the β′-form is considerably influenced by the crystallization conditions.</p></abstract><textClass><keywords scheme="keyword"><list><head>Keywords</head><item><term>triglycerides</term></item><item><term>polymorphism</term></item><item><term>tripalmitin</term></item><item><term>tristearin</term></item><item><term>melting behaviour, synchrotron radiation</term></item><item><term>differential scanning calorimetry (DSC)</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1991-03-07">Modified</change><change when="1991">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/ark:/67375/6H6-S37V4CN4-6/fulltext.txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla"><item-info><jid>CPL</jid><aid>9190119V</aid><ce:pii>0009-3084(91)90119-V</ce:pii><ce:doi>10.1016/0009-3084(91)90119-V</ce:doi><ce:copyright type="unknown" year="1991"></ce:copyright></item-info><head><ce:title>Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin</ce:title><ce:author-group><ce:author><ce:given-name>M.</ce:given-name><ce:surname>Kellens</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup></ce:cross-ref><ce:cross-ref refid="AFF3"><ce:sup>c</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>W.</ce:given-name><ce:surname>Meeussen</ce:surname><ce:cross-ref refid="AFF3"><ce:sup>c</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>R.</ce:given-name><ce:surname>Gehrke</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>H.</ce:given-name><ce:surname>Reynaers</ce:surname><ce:cross-ref refid="COR1"><ce:sup>∗</ce:sup></ce:cross-ref><ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="AFF1"><ce:label>a</ce:label><ce:textfn>Laboratory of Macromolecular Structural Chemistry, Catholic University of Leuven Belgium</ce:textfn></ce:affiliation><ce:affiliation id="AFF2"><ce:label>b</ce:label><ce:textfn>Deutsches Elektronen-Synchrotron (DESY), Hamburg Germany</ce:textfn></ce:affiliation><ce:affiliation id="AFF3"><ce:label>c</ce:label><ce:textfn>n.v. Vandemoortele Coördination Center, R&D Dept., Izegem Belgium</ce:textfn></ce:affiliation><ce:correspondence id="COR1"><ce:label>∗</ce:label><ce:text>Correspondence to: H. Reynaers, Laboratory of Macromolecular Structural Chemistry, Department of Chemistry, Catholic University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium.</ce:text></ce:correspondence></ce:author-group><ce:date-received day="7" month="12" year="1990"></ce:date-received><ce:date-revised day="7" month="3" year="1991"></ce:date-revised><ce:date-accepted day="12" month="3" year="1991"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>Time-resolved X-ray diffraction studies of the polymorphic behaviour of tripalmitin and tristearin during crystallization and melting, have been performed using synchrotron radiation in combination with DSC. Both triglycerides show a large tendency towards β-crystallization. Upon melting the α-phase, recrystallization to β occurs very quickly. The present data do not indicate the intervention of a detectable amount of β′-form during the transformation of α to β. The β′-form can be crystallized from the α-melt without the intervention of the β′-form. No indications are found to support the existence of a liquid-crystalline structure in the α-melt: the slower recrystallization to β, the more isotropic the melt. The α-β transition cannot be described as a simple rearrangement of the molecules, but seems to involve a nucleation and crystal growth process. The high crystallization rate of β from the α-melt as compared to a β-crystallization from the isotropic melt, mainly results from the much faster nucleation, the latter being accelerated by the persistence of crystallites in the α-melt. Melting of the β-form involves a simultaneous increase in disorder in the lateral direction (in the a—b-plane) and along the c-axis of the crystal cell (lamellar arrangement). The present data do not support the persistence of a bilayer structure in the melt above the β-melting temperature. The β′-form of tripalmitin and tristearin can only be obtained from the isotropic melt and is characterized by a typical <ce:italic>β</ce:italic>′<ce:inf>2</ce:inf>-wide angle X-ray diffraction pattern. The two endotherms, appearing in the DSC-thermogram upon melting <ce:italic>β</ce:italic>′<ce:inf>2</ce:inf>, cannot be correlated with two independent β′-subforms (<ce:italic>β</ce:italic>′<ce:inf>2</ce:inf> and <ce:italic>β</ce:italic>′<ce:inf>1</ce:inf>). Crystal perfection and crystallinity of the β′-form is considerably influenced by the crystallization conditions.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:keywords><ce:section-title>Keywords</ce:section-title><ce:keyword><ce:text>triglycerides</ce:text></ce:keyword><ce:keyword><ce:text>polymorphism</ce:text></ce:keyword><ce:keyword><ce:text>tripalmitin</ce:text></ce:keyword><ce:keyword><ce:text>tristearin</ce:text></ce:keyword><ce:keyword><ce:text>melting behaviour, synchrotron radiation</ce:text></ce:keyword><ce:keyword><ce:text>differential scanning calorimetry (DSC)</ce:text></ce:keyword></ce:keywords></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Synchrotron radiation investigations of the polymorphic transitions of saturated monoacid triglycerides. Part 1: Tripalmitin and tristearin</title></titleInfo><name type="personal"><namePart type="given">M.</namePart><namePart type="family">Kellens</namePart><affiliation>Laboratory of Macromolecular Structural Chemistry, Catholic University of Leuven Belgium</affiliation><affiliation>n.v. Vandemoortele Coördination Center, R&D Dept., Izegem Belgium</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">W.</namePart><namePart type="family">Meeussen</namePart><affiliation>n.v. Vandemoortele Coördination Center, R&D Dept., Izegem Belgium</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">R.</namePart><namePart type="family">Gehrke</namePart><affiliation>Deutsches Elektronen-Synchrotron (DESY), Hamburg Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">H.</namePart><namePart type="family">Reynaers</namePart><affiliation>Correspondence to: H. Reynaers, Laboratory of Macromolecular Structural Chemistry, Department of Chemistry, Catholic University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium.</affiliation><affiliation>Laboratory of Macromolecular Structural Chemistry, Catholic University of Leuven Belgium</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article" authority="ISTEX" authorityURI="https://content-type.data.istex.fr" valueURI="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1991</dateIssued><dateModified encoding="w3cdtf">1991-03-07</dateModified><copyrightDate encoding="w3cdtf">1991</copyrightDate></originInfo><abstract lang="en">Abstract: Time-resolved X-ray diffraction studies of the polymorphic behaviour of tripalmitin and tristearin during crystallization and melting, have been performed using synchrotron radiation in combination with DSC. Both triglycerides show a large tendency towards β-crystallization. Upon melting the α-phase, recrystallization to β occurs very quickly. The present data do not indicate the intervention of a detectable amount of β′-form during the transformation of α to β. The β′-form can be crystallized from the α-melt without the intervention of the β′-form. No indications are found to support the existence of a liquid-crystalline structure in the α-melt: the slower recrystallization to β, the more isotropic the melt. The α-β transition cannot be described as a simple rearrangement of the molecules, but seems to involve a nucleation and crystal growth process. The high crystallization rate of β from the α-melt as compared to a β-crystallization from the isotropic melt, mainly results from the much faster nucleation, the latter being accelerated by the persistence of crystallites in the α-melt. Melting of the β-form involves a simultaneous increase in disorder in the lateral direction (in the a—b-plane) and along the c-axis of the crystal cell (lamellar arrangement). The present data do not support the persistence of a bilayer structure in the melt above the β-melting temperature. The β′-form of tripalmitin and tristearin can only be obtained from the isotropic melt and is characterized by a typical β′2-wide angle X-ray diffraction pattern. The two endotherms, appearing in the DSC-thermogram upon melting β′2, cannot be correlated with two independent β′-subforms (β′2 and β′1). Crystal perfection and crystallinity of the β′-form is considerably influenced by the crystallization conditions.</abstract><subject><genre>Keywords</genre><topic>triglycerides</topic><topic>polymorphism</topic><topic>tripalmitin</topic><topic>tristearin</topic><topic>melting behaviour, synchrotron radiation</topic><topic>differential scanning calorimetry (DSC)</topic></subject><relatedItem type="host"><titleInfo><title>Chemistry and Physics of Lipids</title></titleInfo><titleInfo type="abbreviated"><title>CPL</title></titleInfo><genre type="journal" authority="ISTEX" authorityURI="https://publication-type.data.istex.fr" valueURI="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1991</dateIssued></originInfo><identifier type="ISSN">0009-3084</identifier><identifier type="PII">S0009-3084(00)X0256-3</identifier><part><date>1991</date><detail type="volume"><number>58</number><caption>vol.</caption></detail><detail type="issue"><number>1–2</number><caption>no.</caption></detail><extent unit="issue-pages"><start>1</start><end>183</end></extent><extent unit="pages"><start>131</start><end>144</end></extent></part></relatedItem><identifier type="istex">FBBC58A16CBBDC9A2A335E4FF6D4204C53485D8F</identifier><identifier type="ark">ark:/67375/6H6-S37V4CN4-6</identifier><identifier type="DOI">10.1016/0009-3084(91)90119-V</identifier><identifier type="PII">0009-3084(91)90119-V</identifier><recordInfo><recordContentSource authority="ISTEX" authorityURI="https://loaded-corpus.data.istex.fr" valueURI="https://loaded-corpus.data.istex.fr/ark:/67375/XBH-HKKZVM7B-M">elsevier</recordContentSource></recordInfo></mods><json:item><extension>json</extension><original>false</original><mimetype>application/json</mimetype><uri>https://api.istex.fr/ark:/67375/6H6-S37V4CN4-6/record.json</uri></json:item></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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