Chemical markers in Veronica sect. Hebe. III |
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Authors: | Agnese Maggi Rilka Taskova Charlotte Held Gotfredsen Armandodoriani Bianco Søren Rosendal Jensen |
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Institution: | 1. Department of Chemistry, The Technical University of Denmark, DK-2800 Lyngby, Denmark;2. School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand;3. Dipartimento di Chimica, Universita ‘‘La Sapienza’’, Istituto di Chimica Biomolecolare del CNR, 00185 Roma, Italy |
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Abstract: | In a continued chemosystematic investigation of the water-soluble compounds in Veronica sect. Hebe, we have investigated two more of the species formerly classified as Parahebe. Both species contained mannitol in considerable amounts and in addition some glucosides of iridoid acids. Veronica cheesemanii was characterised by aucubin and its esters: 2′-O-benzoylaucubin and an aucubin diester named cheesemanioside. The main iridoid compounds in Veronica hookeriana were catalpol and its ester verminoside, but this species also contained the sugar ester methyl 1-O-benzoyl-3-α-glucuronosylglycerol and a caffeoyl phenylethanoid glycoside (CPG) named parahebeoside, a 2′-O-β-xylopyranosyl derivative of the known plantamajoside. The results show that the studied species of the former genus Parahebe are very different with regard to their chemical content. This is in agreement with the DNA sequence data and implies the genus was polyphyletic as previously circumscribed. |
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Keywords: | Veronica Parahebe Plantaginaceae Chemosystematics Mannitol Iridoid glucosides Phenylethanoid glycosides Glucuronosylglycerol ester |
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