Activity and stability of lipases in the synthesis of butyl lactate
Lactate esters are increasingly used in food, cosmetic and pharmaceutical formulations due to their hygroscopic, emulsifying and exfoliating properties. The lipase-catalysed synthesis of butyl lactate by transesterification was investigated, in order to provide some basic design criteria. Novozyme S...
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ftunivnapoliiris:oai:www.iris.unina.it:11588/329136 2024-09-09T19:10:24+00:00 Activity and stability of lipases in the synthesis of butyl lactate PIROZZI, DOMENICO GRECO, GUIDO Pirozzi, Domenico Greco, Guido 2004 STAMPA http://hdl.handle.net/11588/329136 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000188221300002 volume:34 firstpage:94 lastpage:100 journal:ENZYME AND MICROBIAL TECHNOLOGY http://hdl.handle.net/11588/329136 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0347052802 info:eu-repo/semantics/closedAccess info:eu-repo/semantics/article 2004 ftunivnapoliiris 2024-06-17T15:19:25Z Lactate esters are increasingly used in food, cosmetic and pharmaceutical formulations due to their hygroscopic, emulsifying and exfoliating properties. The lipase-catalysed synthesis of butyl lactate by transesterification was investigated, in order to provide some basic design criteria. Novozyme SP435 (from Candida antarctica) was found to be the most effective biocatalyst for the reaction of interest. The optimum conditions for catalytic activity were determined in terms of temperature (about 70 °C) and thermodynamic water activity (aw=0.060). The effect of the substrate concentration was characterised, as well. The enzyme stability appeared to be critically affected by the reaction medium composition. In particular, increases in the concentration of the lactate esters (both substrate and products) resulted in faster inactivation kinetics, suggesting that the operation in solvent-free medium requires a suitable design of the operating conditions to meet the lipase stability requirements. Improved lipase stability and higher yield were obtained at reduced values of water thermodynamic activity, though the complete dehydration of the enzyme lowered the catalytic activity. Article in Journal/Newspaper Antarc* Antarctica IRIS Università degli Studi di Napoli Federico II |
institution |
Open Polar |
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IRIS Università degli Studi di Napoli Federico II |
op_collection_id |
ftunivnapoliiris |
language |
English |
description |
Lactate esters are increasingly used in food, cosmetic and pharmaceutical formulations due to their hygroscopic, emulsifying and exfoliating properties. The lipase-catalysed synthesis of butyl lactate by transesterification was investigated, in order to provide some basic design criteria. Novozyme SP435 (from Candida antarctica) was found to be the most effective biocatalyst for the reaction of interest. The optimum conditions for catalytic activity were determined in terms of temperature (about 70 °C) and thermodynamic water activity (aw=0.060). The effect of the substrate concentration was characterised, as well. The enzyme stability appeared to be critically affected by the reaction medium composition. In particular, increases in the concentration of the lactate esters (both substrate and products) resulted in faster inactivation kinetics, suggesting that the operation in solvent-free medium requires a suitable design of the operating conditions to meet the lipase stability requirements. Improved lipase stability and higher yield were obtained at reduced values of water thermodynamic activity, though the complete dehydration of the enzyme lowered the catalytic activity. |
author2 |
Pirozzi, Domenico Greco, Guido |
format |
Article in Journal/Newspaper |
author |
PIROZZI, DOMENICO GRECO, GUIDO |
spellingShingle |
PIROZZI, DOMENICO GRECO, GUIDO Activity and stability of lipases in the synthesis of butyl lactate |
author_facet |
PIROZZI, DOMENICO GRECO, GUIDO |
author_sort |
PIROZZI, DOMENICO |
title |
Activity and stability of lipases in the synthesis of butyl lactate |
title_short |
Activity and stability of lipases in the synthesis of butyl lactate |
title_full |
Activity and stability of lipases in the synthesis of butyl lactate |
title_fullStr |
Activity and stability of lipases in the synthesis of butyl lactate |
title_full_unstemmed |
Activity and stability of lipases in the synthesis of butyl lactate |
title_sort |
activity and stability of lipases in the synthesis of butyl lactate |
publishDate |
2004 |
url |
http://hdl.handle.net/11588/329136 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000188221300002 volume:34 firstpage:94 lastpage:100 journal:ENZYME AND MICROBIAL TECHNOLOGY http://hdl.handle.net/11588/329136 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0347052802 |
op_rights |
info:eu-repo/semantics/closedAccess |
_version_ |
1809825404326772736 |