Investigation of glucosinolates in the desert plant Ochradenus baccatus (Brassicales: Resedaceae). Unveiling glucoochradenin, a new arabinosylated glucosinolate
| Autor: | Beny Trabelcy, Michal Samuni-Blank, Mayan Merav, Shmuel Carmeli, Nicka Chinkov, Ido Izhaki, Yoram Gerchman |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Arabinose Stereochemistry Resedaceae Glucosinolates Brassicales Plant Science Horticulture 01 natural sciences Biochemistry Mass Spectrometry Gluconasturtiin Glucobrassicin chemistry.chemical_compound Molecular Biology Chromatography High Pressure Liquid biology 010405 organic chemistry Chemistry Phenyl isothiocyanate Hydrolysis Glucotropaeolin General Medicine biology.organism_classification 0104 chemical sciences Glucosinolate 010606 plant biology & botany |
| Zdroj: | Phytochemistry. 187:112760 |
| ISSN: | 0031-9422 |
| DOI: | 10.1016/j.phytochem.2021.112760 |
| Popis: | Here we describe the structure elucidation and quantification of six glucosinolates (GSLs) from the roots of the desert plant Ochradenus baccatus, Delile 1813 (family Resedaceae; order Brassicales). The structure elucidation was established on the corresponding enzymatically desulfated derivatives of the native GSLs of the plant. Among these GSLs we describe the previously undescribed 2″-O-(α-L-arabinopyranosyloxy)benzylglucosinolate (1a), for which we propose the name glucoochradenin. The other five glucosinolates (2a-6a) were (2S)-2-hydroxy-2-phenylethylglucosinolate (2a; glucobarbarin), 2″-O-(α-L-rhamnopyranosyloxy)benzylglucosinolate (3a), benzylglucosinolate (4a; glucotropaeolin), indol-3-ylmethylglucosinolate (5a; glucobrassicin) and phenethylglucosinolate (6a; gluconasturtiin), all elucidated as their desulfo-derivatives, 2b-6b respectively). Structures were elucidated by MS and 1D and 2D-NMR techniques, the identity of the arabinose verified by ion chromatography, and the absolute configuration of the sugar units determined by hydrolysis, coupling to cysteine methyl-ester and phenyl isothiocyanate followed by HPLC-MS analysis of the resulted diastereomers. Response factors were generated for desulfo-2″-O-(α-L-arabinopyranosyloxy)benzylglucosinolate and for desulfo-2″-O-(α-L-rhamnopyranosyloxy)benzylglucosinolate and all six GSLs were quantified, indicating that the root of O. baccatus is rich in GSLs (Avg. 61.3 ± 10.0 μmol/g DW and up to 337.2 μmol/g DW). |
| Databáze: | OpenAIRE |
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