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• W1985362460 startingPage "610" @default.
• W1985362460 abstract "Five acylated glucosinolates (GSLs) were isolated as desulfated derivatives after enzymatic desulfation of anionic metabolites from seeds of two chemotypes of Barbarea vulgaris, and their structures were elucidated by a combination of spectroscopic methods and HPLC analysis of products of enzymatic de-acylation. The acyl group was in all cases found to be a trans isoferuloyl group at the 6′-position of the thioglucose moiety. The GSL moieties of the native metabolites were found to be one Trp derived; indol-3-ylmethylGSL, as well as four homoPhe derived; phenethylGSL, (S)-2-hydroxy-2-phenylethylGSL, (R)-2-hydroxy-2-phenylethylGSL, and (R)-2-hydroxy-2-(4-hydroxyphenyl)ethylGSL. GSL analysis of B. vulgaris seed extracts by the commonly employed ‘desulfoGSL’ method (based on binding to anion exchange columns, enzymatic desulfation, elution and HPLC) was optimized for 6′-isoferuloyl derivatives of GSLs. From peak areas before and after de-acylation of the isolated desulfoGSL, the response factor of the 6′-isoferuloyl derivative of (S)-2-hydroxy-2-phenylethylGSL was estimated to be 0.37 (relative to 1.00 for sinigrin), allowing us to estimate the level in B. vulgaris to 3 μmol/g dry wt. in mature seeds and less than 0.1 μmol/g dry wt. in seedlings and floral parts of the insect resistant G-type of B. vulgaris var. arcuata. HPLC analysis of intact GSLs in crude extracts and after group separation did not reveal additional derivatives, but confirmed the existence of the deduced intact GSLs. A taxonomic screen showed that most (14/17) B. vulgaris accessions (with the exception of three accessions of var. vulgaris) contained relatively high levels of 6′-isoferuloyl GSLs. The profiles of 6′-isoferuloylated GSLs matched the profiles of non-acylated GSLs in the same seed accessions, suggesting a low side chain specificity of the isoferuloylation mechanism. A minor peak tentatively identified as a dimethoxycinnamoyl derivative of (S)-2-hydroxy-2-phenylethylGSL was detected by HPLC-MS of one accession, suggesting that GSLs with other acyl groups may occur at low levels. A single analyzed B. plantaginae accession contained relatively high levels of 6′-isoferuloylated phenethylGSL and (S)-2-hydroxy-2-phenylethylGSL. Five other tested Barbarea species (B. australis, B. bracteosa, B. intermedia, B. stricta, B. verna) also contained isoferuloylated GSLs, albeit at lower levels than in B. vulgaris and B. plantaginae, suggesting that seed GSL acylation is a general character of the Barbarea genus and possibly also of related genera including Arabidopsis." @default.
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• W1985362460 date "2011-05-01" @default.
• W1985362460 modified "2023-09-26" @default.
• W1985362460 title "Isoferuloyl derivatives of five seed glucosinolates in the crucifer genus Barbarea" @default.
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• W1985362460 doi "https://doi.org/10.1016/j.phytochem.2011.01.034" @default.
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