Chemical markers in Veronica sect. Hebe. II |
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Authors: | Palle Pedersen Charlotte Held Gotfredsen Steven J Wagstaff Søren Rosendal Jensen |
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Institution: | 1. Department of Chemistry, The Technical University of Denmark, DK-2800 Lyngby, Denmark;2. Allan Herbarium, Landcare Research, P.O. Box 40, Lincoln 7640, New Zealand |
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Abstract: | In a continued chemosystematic investigation of the water-soluble compounds in Veronica sect. Hebe, four additional species were investigated. In comparison to other, Northern Hemisphere (NH) species of Veronica, those belonging to the New Zealand species in sect. Hebe are apparently more variable in chemical content. In addition to the compounds characteristic for NH Veronica, namely mannitol, aucubin, catalpol and 6-O-esters of catalpol as well as some caffeoyl phenylethanoid glucosides (CGPs), Veronica topiaria (syn. Hebe topiaria) also gave an unusual 6-O-ester of aucubin named topiarioside. The former Hebe species Veronica cupressoides and Veronica stenophylla each provided one of the two previously undescribed disaccharide esters named hebitol I and II, respectively, and the former plant also provided a CPG named cuproside, a 6-O-β-glucopyranosyl derivative of the known hebeoside. The last species, namely Veronica hulkeana (syn. Heliohebe hulkeana) only contained compounds common to other species of Veronica. The taxonomic results are discussed and it is concluded that carbohydrate esters are common in sect. Hebe. The data so far obtained indicate that the occurrences of esters of 6-O-rhamnopyranosylcatalpol are confined to the most derived species in the section. |
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Keywords: | Veronica Hebe Heliohebe Plantaginaceae Chemosystematics Mannitol Iridoid glucosides Phenylethanoid glycosides Disaccharide esters |
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