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Título: | Efficient α-glucosylation of epigallocatechin gallate catalyzed by cyclodextrin glucanotransferase from Thermoanaerobacter sp. |
Autor: | González-Alfonso, José L.; Leemans, Laura CSIC; Poveda, Ana; Jiménez-Barbero, Jesús CSIC ORCID; Plou Gasca, Francisco José CSIC ORCID | Palabras clave: | Glycosylation Tea polyphenols Antioxidants Catechins Cyclodextrin glucosyltransferase Enzymatic glucosylation |
Fecha de publicación: | 25-jun-2018 | Editor: | American Chemical Society | Citación: | Journal of Agricultural and Food Chemistry 66(28): 7402-7408 (2018) | Resumen: | The glycosylation of plant polyphenols may modulate their solubility and bioavailability, and protect these molecules from oxygen, light degradation and during gastrointestinal transit. In this work, the synthesis of various α-glucosyl derivatives of (‒)-epigallocatechin gallate (EGCG), the predominant catechin in green tea, was performed in water at 50 °C by a transglycosylation reaction catalyzed by cyclodextrin glycosyltransferase (CGTase) from Thermoanaerobacter sp. The molecular weight of reaction products was determined by HPLC-MS. Using hydrolyzed potato starch as glucosyl donor, two main monoglucosides were obtained with conversion yields of 58% and 13%, respectively. The products were isolated and chemically characterized by combining 2D-NMR methods. The major derivative was epigallocatechin gallate 3’-O-α-D-glucopyranoside (1) and the minor epigallocatechin gallate 7-O-α-D-glucopyranoside (2). | Versión del editor: | http://dx.doi.org/10.1021/acs.jafc.8b02143 | URI: | http://hdl.handle.net/10261/167290 | DOI: | 10.1021/acs.jafc.8b02143 | ISSN: | 0021-8561 | E-ISSN: | 1520-5118 |
Aparece en las colecciones: | (ICP) Artículos |
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