Magnetic Ligand Fishing as a Targeting Tool for HPLC-HRMS-SPE-NMR: α-Glucosidase Inhibitory Ligands and Alkylresorcinol Glycosides from Eugenia catharinae.
J Nat Prod
; 78(11): 2657-65, 2015 Nov 25.
Article
en En
| MEDLINE
| ID: mdl-26496505
ABSTRACT
A bioanalytical platform combining magnetic ligand fishing for α-glucosidase inhibition profiling and HPLC-HRMS-SPE-NMR for structural identification of α-glucosidase inhibitory ligands, both directly from crude plant extracts, is presented. Magnetic beads with N-terminus-coupled α-glucosidase were synthesized and characterized for their inherent catalytic activity. Ligand fishing with the immobilized enzyme was optimized using an artificial test mixture consisting of caffeine, ferulic acid, and luteolin before proof-of-concept with the crude extract of Eugenia catharinae. The combination of ligand fishing and HPLC-HRMS-SPE-NMR identified myricetin 3-O-α-L-rhamnopyranoside, myricetin, quercetin, and kaempferol as α-glucosidase inhibitory ligands in E. catharinae. Furthermore, HPLC-HRMS-SPE-NMR analysis led to identification of six new alkylresorcinol glycosides, i.e., 5-(2-oxopentyl)resorcinol 4-O-ß-D-glucopyranoside, 5-propylresorcinol 4-O-ß-D-glucopyranoside, 5-pentylresorcinol 4-O-[α-D-apiofuranosyl-(1â6)]-ß-D-glucopyranoside, 5-pentylresorcinol 4-O-ß-D-glucopyranoside, 4-hydroxy-3-O-methyl-5-pentylresorcinol 1-O-ß-D-glucopyranoside, and 3-O-methyl-5-pentylresorcinol 1-O-[ß-D-glucopyranosyl-(1â6)]-ß-D-glucopyranoside.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Resorcinoles
/
Alfa-Glucosidasas
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Inhibidores de Glicósido Hidrolasas
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Eugenia
/
Glicósidos
País/Región como asunto:
America do sul
/
Brasil
Idioma:
En
Revista:
J Nat Prod
Año:
2015
Tipo del documento:
Article
País de afiliación:
Dinamarca