Biocatalyzed generation of molecular diversity: Selective modification of the saponin asiaticoside, Adv
Abstract: An array of different derivatives of the complex ursane-type triterpene glycoside asiaticoside (1), a saponin component isolated from the perennial herb Centella asiatica, was generated by exploiting the stereo-, regio-and site-selectivity of four groups of enzymes (glycosidases, glycosylt...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1037.9663 2023-05-15T13:34:30+02:00 Biocatalyzed generation of molecular diversity: Selective modification of the saponin asiaticoside, Adv Daniela Monti Andrea Candido M Manuel Cruz Silva Vladimir Křen Sergio Riva Bruno Danieli The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1037.9663 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1037.9663 Metadata may be used without restrictions as long as the oai identifier remains attached to it. https://estudogeral.sib.uc.pt/bitstream/10316/8379/1/obra.pdf text 2005 ftciteseerx 2020-03-08T01:18:15Z Abstract: An array of different derivatives of the complex ursane-type triterpene glycoside asiaticoside (1), a saponin component isolated from the perennial herb Centella asiatica, was generated by exploiting the stereo-, regio-and site-selectivity of four groups of enzymes (glycosidases, glycosyltransferases, lipases and laccases). A library of extracellular a-l-rhamnosidases (31 different items) was obtained by screening 16 different fungal strains under different cultivation conditions, and several of these preparations catalyzed the derhamnosylation of asiaticoside. Specifically, the enzymes produced by Fusarium oxysporum were selected for the synthesis of derhamno-degluco-asiaticoside (2) and also of derhamno-asiaticoside (3), by in situ glucose-inhibition of contaminating bd-glucosidases. b-1,4-Galactosyltransferase from bovine milk was subsequently used for the galactosylation of the two asiaticoside derivatives 2 and 3, using 20% v/v DMSO as a cosolvent in order to increase substrate solubility. Finally, new acylated and oxidized derivatives of asiaticoside were also prepared by exploiting the lipase from Candida antarctica (Novozym 435) and the laccase from Trametes pubescens, respectively. Text Antarc* Antarctica Unknown |
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description |
Abstract: An array of different derivatives of the complex ursane-type triterpene glycoside asiaticoside (1), a saponin component isolated from the perennial herb Centella asiatica, was generated by exploiting the stereo-, regio-and site-selectivity of four groups of enzymes (glycosidases, glycosyltransferases, lipases and laccases). A library of extracellular a-l-rhamnosidases (31 different items) was obtained by screening 16 different fungal strains under different cultivation conditions, and several of these preparations catalyzed the derhamnosylation of asiaticoside. Specifically, the enzymes produced by Fusarium oxysporum were selected for the synthesis of derhamno-degluco-asiaticoside (2) and also of derhamno-asiaticoside (3), by in situ glucose-inhibition of contaminating bd-glucosidases. b-1,4-Galactosyltransferase from bovine milk was subsequently used for the galactosylation of the two asiaticoside derivatives 2 and 3, using 20% v/v DMSO as a cosolvent in order to increase substrate solubility. Finally, new acylated and oxidized derivatives of asiaticoside were also prepared by exploiting the lipase from Candida antarctica (Novozym 435) and the laccase from Trametes pubescens, respectively. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Daniela Monti Andrea Candido M Manuel Cruz Silva Vladimir Křen Sergio Riva Bruno Danieli |
spellingShingle |
Daniela Monti Andrea Candido M Manuel Cruz Silva Vladimir Křen Sergio Riva Bruno Danieli Biocatalyzed generation of molecular diversity: Selective modification of the saponin asiaticoside, Adv |
author_facet |
Daniela Monti Andrea Candido M Manuel Cruz Silva Vladimir Křen Sergio Riva Bruno Danieli |
author_sort |
Daniela Monti |
title |
Biocatalyzed generation of molecular diversity: Selective modification of the saponin asiaticoside, Adv |
title_short |
Biocatalyzed generation of molecular diversity: Selective modification of the saponin asiaticoside, Adv |
title_full |
Biocatalyzed generation of molecular diversity: Selective modification of the saponin asiaticoside, Adv |
title_fullStr |
Biocatalyzed generation of molecular diversity: Selective modification of the saponin asiaticoside, Adv |
title_full_unstemmed |
Biocatalyzed generation of molecular diversity: Selective modification of the saponin asiaticoside, Adv |
title_sort |
biocatalyzed generation of molecular diversity: selective modification of the saponin asiaticoside, adv |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1037.9663 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
https://estudogeral.sib.uc.pt/bitstream/10316/8379/1/obra.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1037.9663 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766053751526785024 |