Enzymatic synthesis of epoxy fatty acid starch ester in ionic liquid–organic solvent mixture from vernonia oil
Abstract In this study, epoxy fatty acid esters of cassava starch were synthesized by reacting cassava starch with vernonia oil methyl ester (epoxy ester) using 1‐butyl‐3‐methylimidazolium hexafluorophosphate, [C 4 C 1 Im][PF 6 ] ionic liquid (IL) as a reaction medium and DMSO as co‐solvent. Lipase...
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crwiley:10.1002/star.201300142 2024-06-02T07:58:17+00:00 Enzymatic synthesis of epoxy fatty acid starch ester in ionic liquid–organic solvent mixture from vernonia oil Desalegn, Tegene Garcia, Ignacio J. Villar Titman, Jeremy Licence, Peter Diaz, Isabel Chebude, Yonas 2013 http://dx.doi.org/10.1002/star.201300142 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fstar.201300142 https://onlinelibrary.wiley.com/doi/pdf/10.1002/star.201300142 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Starch - Stärke volume 66, issue 3-4, page 385-392 ISSN 0038-9056 1521-379X journal-article 2013 crwiley https://doi.org/10.1002/star.201300142 2024-05-03T11:48:26Z Abstract In this study, epoxy fatty acid esters of cassava starch were synthesized by reacting cassava starch with vernonia oil methyl ester (epoxy ester) using 1‐butyl‐3‐methylimidazolium hexafluorophosphate, [C 4 C 1 Im][PF 6 ] ionic liquid (IL) as a reaction medium and DMSO as co‐solvent. Lipase Candida antarctica fraction B (Novozyme 435) was used as a catalyst for the esterification reaction. In the optimized reaction conditions, a degree of substitution (DS) of 0.95 was achieved, at a reaction temperature of 40°C within 72 h of reaction time. The new cassava starch esters were characterized by infrared (FTIR), solid state NMR (CP/MAS 13 C NMR), SEM, XRD, thermogravimetric analysis (TGA), and DSC. FTIR and NMR spectroscopy analyses confirmed the successful esterification of starch and the DS was calculated to be 0.95 by titration methods. SEM and XRD studies showed that the morphology and crystallinity of native cassava starch were significantly changed upon esterification producing a continuous and amorphous material. Finally, the thermal behavior of the native and the starch vernolate was investigated using TGA and DSC techniques. The results revealed a change in the characteristic melting point and decomposition pattern of the new polymer. The onset decomposition temperature of the new starch vernolate is similar to the native form. Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library Starch - Stärke 66 3-4 385 392 |
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Wiley Online Library |
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English |
description |
Abstract In this study, epoxy fatty acid esters of cassava starch were synthesized by reacting cassava starch with vernonia oil methyl ester (epoxy ester) using 1‐butyl‐3‐methylimidazolium hexafluorophosphate, [C 4 C 1 Im][PF 6 ] ionic liquid (IL) as a reaction medium and DMSO as co‐solvent. Lipase Candida antarctica fraction B (Novozyme 435) was used as a catalyst for the esterification reaction. In the optimized reaction conditions, a degree of substitution (DS) of 0.95 was achieved, at a reaction temperature of 40°C within 72 h of reaction time. The new cassava starch esters were characterized by infrared (FTIR), solid state NMR (CP/MAS 13 C NMR), SEM, XRD, thermogravimetric analysis (TGA), and DSC. FTIR and NMR spectroscopy analyses confirmed the successful esterification of starch and the DS was calculated to be 0.95 by titration methods. SEM and XRD studies showed that the morphology and crystallinity of native cassava starch were significantly changed upon esterification producing a continuous and amorphous material. Finally, the thermal behavior of the native and the starch vernolate was investigated using TGA and DSC techniques. The results revealed a change in the characteristic melting point and decomposition pattern of the new polymer. The onset decomposition temperature of the new starch vernolate is similar to the native form. |
format |
Article in Journal/Newspaper |
author |
Desalegn, Tegene Garcia, Ignacio J. Villar Titman, Jeremy Licence, Peter Diaz, Isabel Chebude, Yonas |
spellingShingle |
Desalegn, Tegene Garcia, Ignacio J. Villar Titman, Jeremy Licence, Peter Diaz, Isabel Chebude, Yonas Enzymatic synthesis of epoxy fatty acid starch ester in ionic liquid–organic solvent mixture from vernonia oil |
author_facet |
Desalegn, Tegene Garcia, Ignacio J. Villar Titman, Jeremy Licence, Peter Diaz, Isabel Chebude, Yonas |
author_sort |
Desalegn, Tegene |
title |
Enzymatic synthesis of epoxy fatty acid starch ester in ionic liquid–organic solvent mixture from vernonia oil |
title_short |
Enzymatic synthesis of epoxy fatty acid starch ester in ionic liquid–organic solvent mixture from vernonia oil |
title_full |
Enzymatic synthesis of epoxy fatty acid starch ester in ionic liquid–organic solvent mixture from vernonia oil |
title_fullStr |
Enzymatic synthesis of epoxy fatty acid starch ester in ionic liquid–organic solvent mixture from vernonia oil |
title_full_unstemmed |
Enzymatic synthesis of epoxy fatty acid starch ester in ionic liquid–organic solvent mixture from vernonia oil |
title_sort |
enzymatic synthesis of epoxy fatty acid starch ester in ionic liquid–organic solvent mixture from vernonia oil |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1002/star.201300142 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fstar.201300142 https://onlinelibrary.wiley.com/doi/pdf/10.1002/star.201300142 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Starch - Stärke volume 66, issue 3-4, page 385-392 ISSN 0038-9056 1521-379X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/star.201300142 |
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Starch - Stärke |
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66 |
container_issue |
3-4 |
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385 |
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392 |
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1800741585747443712 |