caa a22 4500 469038195 CHVBK 20180323132801.0 cr unu---uuuuu 170328e19920801xx s 000 0 eng 10.1007/BF00812322 doi (NATIONALLICENCE)springer-10.1007/BF00812322 On the nature of "soluble” hypericin in Hypericum species [Elektronische Daten] [Heinz Falk, Wolfgang Schmitzberger] Zur Natur des "löslichen" Hypericins in Hypericum -Arten Summary: The two red and two violet "soluble” pigments ofHypericum species were isolated by means of extraction, chromatography, and counter-current droplet chromatography. In contrast to authentic hypericin, they are soluble in common organic solvents and even in water. Using NMR experiments it was deduced that hypericin, pseudohypericin, protohypericin, and protopseudohypericin are present in the plant as their rapidly interconverting 3- and 4-phenolate ions. From AAS the main counter-ion of these phenolates was derived to be potassium. The potassium and N-ethyl-N,N-diisopropylammonium salts of hypericin were synthesizcd for comparison. A preparative procedure to isolate hypericin and pseudohypericin from plant material was developed. Springer-Verlag, 1992 "Soluble” Hypericin nationallicence Hypericin-, Pseudohypericin-, Protohypericin-, Protopseudohypericin-, Potassium salts nationallicence 1H-NMR nationallicence 13C-NMR nationallicence Droplet counter-current chromatography nationallicence Hypericum perforatum L nationallicence Falk Heinz Institut für Chemie, Johannes-Kepler-Universität Linz, A-4040, Linz, Austria aut Schmitzberger Wolfgang Institut für Chemie, Johannes-Kepler-Universität Linz, A-4040, Linz, Austria aut Monatshefte für Chemie / Chemical Monthly Springer-Verlag 123/8-9(1992-08-01), 731-739 0026-9247 123:8-9<731 1992 123 706 https://doi.org/10.1007/BF00812322 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00812322 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Falk Heinz Institut für Chemie, Johannes-Kepler-Universität Linz, A-4040, Linz, Austria aut NATIONALLICENCE 700 1- Schmitzberger Wolfgang Institut für Chemie, Johannes-Kepler-Universität Linz, A-4040, Linz, Austria aut NATIONALLICENCE 773 0- Monatshefte für Chemie / Chemical Monthly Springer-Verlag 123/8-9(1992-08-01), 731-739 0026-9247 123:8-9<731 1992 123 706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer