Estolide Molecular Weight Distribution via Gel Permeation Chromatography
Using the universal calibration and the Mark‐Houwink equation (MHE) (ηj=KMjα), three batches of oleic estolide acids and their corresponding 2‐ethylhexyl esters were characterized using gel permeation chromatography (GPC). The MHE parameters in tetrahydrofuran (THF) at 40 °C were determined (for aci...
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| Veröffentlicht in: | Journal of the American Oil Chemists' Society 2019-04, Vol.96 (4), p.365-380 |
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| creator | Bantchev, Grigor B. Cermak, Steven C. Durham, Amber L. Price, Neil P. J. |
| description | Using the universal calibration and the Mark‐Houwink equation (MHE) (ηj=KMjα), three batches of oleic estolide acids and their corresponding 2‐ethylhexyl esters were characterized using gel permeation chromatography (GPC). The MHE parameters in tetrahydrofuran (THF) at 40 °C were determined (for acids: α = 0.442 ± 0.003 and log10K=2.505 ± 0.007, for esters: α =0.531 ± 0.006 and log10K =2.794 ± 0.018). The fits of the GPC chromatograms yielded also the oligomeric composition of the estolides, which can be used to calculate the estolide number (EN) of an estolide mixture, and other molecular‐weight distribution parameters, such as number‐average molecular weight (Mn), weight‐average molecular weight (Mw), and dispersity (Ð). Using the Deming line fit, we concluded that the GPC should be expected to be approximately three times more sensitive than the currently used methods for determination of EN values. |
| doi_str_mv | 10.1002/aocs.12165 |
| format | Article |
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Using the Deming line fit, we concluded that the GPC should be expected to be approximately three times more sensitive than the currently used methods for determination of EN values.</description><identifier>ISSN: 0003-021X</identifier><identifier>EISSN: 1558-9331</identifier><identifier>DOI: 10.1002/aocs.12165</identifier><language>eng</language><publisher>Hoboken, USA: John Wiley & Sons, Inc</publisher><subject>equations ; Estolides ; gel chromatography ; Gel permeation chromatography ; Intrinsic viscosity ; molecular weight ; Molecular weight distribution ; oleic acid ; tetrahydrofuran</subject><ispartof>Journal of the American Oil Chemists' Society, 2019-04, Vol.96 (4), p.365-380</ispartof><rights>Published 2019. 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Using the Deming line fit, we concluded that the GPC should be expected to be approximately three times more sensitive than the currently used methods for determination of EN values.</description><subject>equations</subject><subject>Estolides</subject><subject>gel chromatography</subject><subject>Gel permeation chromatography</subject><subject>Intrinsic viscosity</subject><subject>molecular weight</subject><subject>Molecular weight distribution</subject><subject>oleic acid</subject><subject>tetrahydrofuran</subject><issn>0003-021X</issn><issn>1558-9331</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp9kE1Lw0AQhhdRsFYv_oIcRUjdz6Q5llhboVJBRW_LZjNpVzbdupso-femjWdPw8z7zMA8CF0TPCEY0zvldJgQShJxgkZEiGmcMUZO0QhjzGJMycc5ugjhs2-njIoRWs5D46wpIXpyFnRrlY_ewWy2TXRvQuNN0TbG7aJvo6IF2OgZfA3qOMq33tWqcRuv9tvuEp1Vyga4-qtj9PYwf82X8Wq9eMxnq1gznIhYF0klykpznSVVplKhGHBOeUoynpZFlfaZ4gXJiEggK0kxLVVBBeG4AtBJwcboZri79-6rhdDI2gQN1qoduDZIylnGaf8b69HbAdXeheChkntvauU7SbA86JIHXfKoq4fJAP8YC90_pJyt85dh5xegO25S</recordid><startdate>201904</startdate><enddate>201904</enddate><creator>Bantchev, Grigor B.</creator><creator>Cermak, Steven C.</creator><creator>Durham, Amber L.</creator><creator>Price, Neil P. 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J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Estolide Molecular Weight Distribution via Gel Permeation Chromatography</atitle><jtitle>Journal of the American Oil Chemists' Society</jtitle><date>2019-04</date><risdate>2019</risdate><volume>96</volume><issue>4</issue><spage>365</spage><epage>380</epage><pages>365-380</pages><issn>0003-021X</issn><eissn>1558-9331</eissn><abstract>Using the universal calibration and the Mark‐Houwink equation (MHE) (ηj=KMjα), three batches of oleic estolide acids and their corresponding 2‐ethylhexyl esters were characterized using gel permeation chromatography (GPC). The MHE parameters in tetrahydrofuran (THF) at 40 °C were determined (for acids: α = 0.442 ± 0.003 and log10K=2.505 ± 0.007, for esters: α =0.531 ± 0.006 and log10K =2.794 ± 0.018). The fits of the GPC chromatograms yielded also the oligomeric composition of the estolides, which can be used to calculate the estolide number (EN) of an estolide mixture, and other molecular‐weight distribution parameters, such as number‐average molecular weight (Mn), weight‐average molecular weight (Mw), and dispersity (Ð). Using the Deming line fit, we concluded that the GPC should be expected to be approximately three times more sensitive than the currently used methods for determination of EN values.</abstract><cop>Hoboken, USA</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1002/aocs.12165</doi><tpages>16</tpages><orcidid>https://orcid.org/0000-0002-8032-6064</orcidid><orcidid>https://orcid.org/0000-0001-6287-1053</orcidid><orcidid>https://orcid.org/0000-0001-6255-4357</orcidid><orcidid>https://orcid.org/0000-0003-2790-5195</orcidid></addata></record> |
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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | equations Estolides gel chromatography Gel permeation chromatography Intrinsic viscosity molecular weight Molecular weight distribution oleic acid tetrahydrofuran |
| title | Estolide Molecular Weight Distribution via Gel Permeation Chromatography |
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