Dual High-Resolution α-Glucosidase and PTP1B Inhibition Profiling Combined with HPLC-PDA-HRMS-SPE-NMR Analysis for the Identification of Potentially Antidiabetic Chromene Meroterpenoids from Rhododendron capitatum
| Autor: | Kenneth T. Kongstad, Chao Liang, Louise Kjaerulff, Dan Staerk, Paul R. Hansen |
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| Rok vydání: | 2021 |
| Předmět: |
Pharmacology
Chemistry Stereochemistry α glucosidase Organic Chemistry Ethyl acetate Pharmaceutical Science High resolution Analytical Chemistry chemistry.chemical_compound Complementary and alternative medicine Ursolic acid Drug Discovery Molecular Medicine Chromane Hplc pda Oleanolic acid Two-dimensional nuclear magnetic resonance spectroscopy |
| Zdroj: | Journal of Natural Products. 84:2454-2467 |
| ISSN: | 1520-6025 0163-3864 |
| DOI: | 10.1021/acs.jnatprod.1c00454 |
| Popis: | Thirteen previously undescribed chromene meroterpenoids, capitachromenic acids A-M (3-6, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, and 11b), were identified from an ethyl acetate extract of Rhododendron capitatum, using dual high-resolution α-glucosidase and PTP1B inhibition profiling in combination with HPLC-PDA-HRMS-SPE-NMR. In addition, one known chromene meroterpenoid, daurichromenic acid (15), and its biosynthetic precursor, grifolic acid (12), two C-methylated flavanones, (2S)-5,7,4'-trihydroxy-8-methylflavanone (1) and farrerol (2), and two triterpenoids, oleanolic acid (14a) and ursolic acid (14b), were identified. New structures were elucidated by extensive 1D and 2D NMR analysis, and absolute configurations of new chromene meroterpenoids were assigned by analysis of their ECD spectra on the basis of the empirical chromane helicity rule and from Rh2(OCOCF3)4-induced ECD spectra by applying the bulkiness rule. Compounds 5, 9a, 9b, 12, and 15 showed α-glucosidase inhibitory activity with IC50 values ranging from 8.0 to 93.5 μM, while compounds 3, 5, 8b, 9a, 9b, 10b, 11b, 12, and 15 showed PTP1B inhibitory activity with IC50 values ranging from 2.5 to 68.1 μM. |
| Databáze: | OpenAIRE |
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