Humilixanthin a new betaxanthin from Rivina humilis |
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| Institution: | 1. Institut für Biochemie der Universität zu Köln, An der Bottmühle 2, D-5000 Köln 1, F.R.G.;2. Gesellschaft für Biotechnologische Forschung (GBF), Mascheroder Weg 1, D-3300 Braunschweig, F.R.G.;1. Department of Materials and Ceramic Engineering/CICECO – Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal;2. Physics Department/CICECO – Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal;1. Senckenberg Biodiversity and Climate Research Center, Senckenberg Gesellschaft für Naturforschung, Senckenberganlage 25, D-60325, Frankfurt am Main, Germany;2. Department of Biology, Institute of Ecology, Evolution and Diversity, Goethe University, Max-von-Laue-Str. 13, D-60439, Frankfurt am Main, Germany;3. Conservation Genetics Group, Senckenberg Research Institute and Natural History Museum Frankfurt, Clamecystraße 12, 63571, Gelnhausen, Germany;4. Integrative Fungal Research Cluster (IPF), Senckenberganlage 25, D-60325, Frankfurt am Main, Germany;5. Pamukkale University, Science and Arts Faculty, Biology Department, Kinikli, Denizli, TR-20017, Turkey;6. National Academy of Sciences of Armenia, Institute of Botany, Dept. Systematics and Plant Geography, Acharyan str. 1, 0063, Yerevan, Armenia;7. Department of Zoology, Ghazi University, Dera Ghazi Khan, Punjab, Pakistan;8. Department of Botany, Faculty of Science, Palacký University Olomouc, ?lechtitel? 27, 783 71, Olomouc, Czech Republic;9. Institute of Botany 210, University of Hohenheim, D-70593, Stuttgart, Germany;10. Taurida Academy of V.I. Vernadsky Crimean Federal University, 4 Vernadskogo Avenue, 295007, Simferopol, Republic of Crimea, Russia;1. Assistant Professor, Department of Prosthodontics, School of Dentistry, Istanbul Medipol University, Istanbul, Turkey;2. Assistant Professor, Department of Prosthodontics, School of Dentistry, Istanbul Medipol University, Istanbul, Turkey;2. Department of Surgery and Cancer, Imperial College London, Division of Computational and Systems Medicine, London SW7 2AZ, United Kingdom;3. Pathology Department, Minia University, Minia, Egypt;4. Department of Medicine, University College London, Royal Free Hospital, London NW3 2QG, United Kingdom |
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| Abstract: | A new betalain has been isolated from fruits ofRivina humilis and identified as the betaxanthin humilixanthin, the 5-hydroxynorvaline-immonium conjugate of betalamic acid. Its structure was elucidated and characterized by1H NMR spectroscopy, FAB mass and GC/MS spectrometry, UV/Vis absorption spectroscopy, high-performance liquid chromatography, thin-layer chromatography and electrophoresis. The structure of the amino acid moiety 5-hydroxynorvaline (2-amino-5-hydroxyvaleric acid) was unambiguously confirmed by comparison with synthetic reference material. Humilixanthin was also detected in fruits ofPhytolacca acinosa andP. bogotensis, in petals ofDelosperma luteum,Lampranthus aurantiacus,L. peersii,Portulaca grandiflora, and in the yellow-coloured root ofBeta vulgaris. |
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