Lipase catalysed conversion of triglycerides to amides in liquid ammonia
Abstract Immobilised lipase B ( Candida antarctica lipase B) is, perhaps unexpectedly, catalytically active in liquid ammonia and exhibits chain length selectivity in the ammonolysis of triglycerides. Using glycerol triacetate as the substrate, the ammonolysis of only the first ester linkage is cata...
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crwiley:10.1002/poc.3583 2024-09-15T17:45:49+00:00 Lipase catalysed conversion of triglycerides to amides in liquid ammonia Griffin, Joseph M. Atherton, John H. Page, Michael I. Powles, Nicholas T. IPOS 2016 http://dx.doi.org/10.1002/poc.3583 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fpoc.3583 https://onlinelibrary.wiley.com/doi/pdf/10.1002/poc.3583 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Physical Organic Chemistry volume 29, issue 12, page 768-772 ISSN 0894-3230 1099-1395 journal-article 2016 crwiley https://doi.org/10.1002/poc.3583 2024-08-13T04:16:09Z Abstract Immobilised lipase B ( Candida antarctica lipase B) is, perhaps unexpectedly, catalytically active in liquid ammonia and exhibits chain length selectivity in the ammonolysis of triglycerides. Using glycerol triacetate as the substrate, the ammonolysis of only the first ester linkage is catalysed by the enzyme, whereas for glycerol tributyrate, the cleavage of all three ester groups is catalysed and converted to the corresponding amide. These observations represent the first example of the use of enzymes in pure liquid ammonia, exemplifying both catalysis and selectivity. Glycerol trioleate is relatively stable in liquid ammonia but, with Candida antarctica lipase B present, readily undergoes ammonolysis to give oleamide and glycerol even at 25 °C. There is no enzyme‐catalysed ammonolysis with the native lipase as it is insoluble in liquid ammonia. The solvolysis of triglycerides in liquid ammonia occurs by a stepwise conversion of the triester to diester to monoester to glycerol with one equivalent of carboxylic acid amide produced at each stage. The pseudo first‐order rate constants for each of the three steps of the uncatalysed ammonolysis of triglycerides in liquid ammonia decrease with increasing alkyl chain length in the carboxyl residue as expected from a small steric effect. Copyright © 2016 John Wiley & Sons, Ltd. Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library Journal of Physical Organic Chemistry 29 12 768 772 |
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English |
description |
Abstract Immobilised lipase B ( Candida antarctica lipase B) is, perhaps unexpectedly, catalytically active in liquid ammonia and exhibits chain length selectivity in the ammonolysis of triglycerides. Using glycerol triacetate as the substrate, the ammonolysis of only the first ester linkage is catalysed by the enzyme, whereas for glycerol tributyrate, the cleavage of all three ester groups is catalysed and converted to the corresponding amide. These observations represent the first example of the use of enzymes in pure liquid ammonia, exemplifying both catalysis and selectivity. Glycerol trioleate is relatively stable in liquid ammonia but, with Candida antarctica lipase B present, readily undergoes ammonolysis to give oleamide and glycerol even at 25 °C. There is no enzyme‐catalysed ammonolysis with the native lipase as it is insoluble in liquid ammonia. The solvolysis of triglycerides in liquid ammonia occurs by a stepwise conversion of the triester to diester to monoester to glycerol with one equivalent of carboxylic acid amide produced at each stage. The pseudo first‐order rate constants for each of the three steps of the uncatalysed ammonolysis of triglycerides in liquid ammonia decrease with increasing alkyl chain length in the carboxyl residue as expected from a small steric effect. Copyright © 2016 John Wiley & Sons, Ltd. |
author2 |
IPOS |
format |
Article in Journal/Newspaper |
author |
Griffin, Joseph M. Atherton, John H. Page, Michael I. Powles, Nicholas T. |
spellingShingle |
Griffin, Joseph M. Atherton, John H. Page, Michael I. Powles, Nicholas T. Lipase catalysed conversion of triglycerides to amides in liquid ammonia |
author_facet |
Griffin, Joseph M. Atherton, John H. Page, Michael I. Powles, Nicholas T. |
author_sort |
Griffin, Joseph M. |
title |
Lipase catalysed conversion of triglycerides to amides in liquid ammonia |
title_short |
Lipase catalysed conversion of triglycerides to amides in liquid ammonia |
title_full |
Lipase catalysed conversion of triglycerides to amides in liquid ammonia |
title_fullStr |
Lipase catalysed conversion of triglycerides to amides in liquid ammonia |
title_full_unstemmed |
Lipase catalysed conversion of triglycerides to amides in liquid ammonia |
title_sort |
lipase catalysed conversion of triglycerides to amides in liquid ammonia |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1002/poc.3583 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fpoc.3583 https://onlinelibrary.wiley.com/doi/pdf/10.1002/poc.3583 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Journal of Physical Organic Chemistry volume 29, issue 12, page 768-772 ISSN 0894-3230 1099-1395 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/poc.3583 |
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Journal of Physical Organic Chemistry |
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29 |
container_issue |
12 |
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768 |
op_container_end_page |
772 |
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1810493720899878912 |