Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Rukmal Ratnayake"'
Publikováno v:
Ceylon Journal of Science, Vol 48, Iss 1, Pp 97-100 (2019)
Two new epoxy butenolides, (4S)-4-methyl-2-(9-epoxy-11-dodecynyl)-2-butenolide and (4S)-4-methyl-2-((9Z)-11-epoxy-9-dodecenyl)-2-butenolide were isolated from the dichloromethane extract of Hortonia angustifolia. They were characterized by means of M
Externí odkaz:
https://doaj.org/article/40868ce0f913408a8e17e9d6738f52cd
Publikováno v:
Ceylon Journal of Science, Vol 46, Iss 3, Pp 115-118 (2017)
A new tetracyclic sesquiterpene, 1, 5, 12 trimethyltetracyclic [6, 3, 0, 0, 03, 4, 8] dodecane was isolated from the dichloromethane extract of Hortonia angustifolia. It was characterized by means of Mass and NMR spectroscopic analysis. It was found
Externí odkaz:
https://doaj.org/article/a0055517362a4c24a4a74cd145952caa
Autor:
Raymond J. Andersen, Shanal Shalindra Bandara Gunasekera, Veranja Karunaratne, Rukmal Ratnayake, David E. Williams
Publikováno v:
Ceylon Journal of Science. 48:97
Two new epoxy butenolides, (4S)-4-methyl-2-(9-epoxy-11-dodecynyl)-2-butenolide and (4S)-4-methyl-2-((9Z)-11-epoxy-9-dodecenyl)-2-butenolide were isolated from the dichloromethane extract of Hortonia angustifolia. They were characterized by means of M
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::140a9ac1ee1326ab4817bf6da36fdbb6
https://doi.org/10.4038/cjs.v48i1.7594
https://doi.org/10.4038/cjs.v48i1.7594
Publikováno v:
Ceylon Journal of Science. 47:287
Ageratina riparia (Regel) R.M. King and H. Rob. of the family Asteraceae is an invasive weed distributed widely in the montane regions of the Central Province of Sri Lanka. The present study was carried out to investigate the antifungal components of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::24252661ab74efe19ad2257ad0cd9f4f
https://doi.org/10.4038/cjs.v47i3.7536
https://doi.org/10.4038/cjs.v47i3.7536
Autor:
Peta Simmonds, Veranja Karunaratne, John K. MacLeod, Rukmal Ratnayake, Siril Wijesundara, B. M. Ratnayake Bandara
Publikováno v:
Natural Product Research. 22:1393-1402
The dichloromethane extracts of the leaves, stem bark, bark and the roots of the three species of the primitive endemic genus Hortonia, H. angustifolia, H. floribunda and H. ovalifolia, collected from nine geographical locations ranging from lower el
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c73d3fee7975257a3f5afc8c6a4c4703
https://doi.org/10.1080/14786410701722433
https://doi.org/10.1080/14786410701722433
Autor:
Rukmal Ratnayake, Veranja Karunaratne, Tamsin Tarling, Gavin Carr, Siril Wijesundara, Michel Roberge, Ratnayake Bandara, Raymond J. Andersen, Aruna D. Balgi, David E. Williams
Publikováno v:
Journal of Natural Products. 75:1189-1191
The new hexahydroazulenones hortonones A (1) to C (3) were isolated from the leaves of three representative species of the endemic Sri Lankan genus Hortonia that belongs to the family Monimiaceae. Hortonones A (1) and B (2) have the unprecedented rea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1e603df5cf569447a4f5f0579ac06ec
https://doi.org/10.1021/np200927k
https://doi.org/10.1021/np200927k
Autor:
D. Siril. A. Wijesundara, B. M. Ratnayake Bandara, Rukmal Ratnayake, Raymond J. Andersen, Gavin Carr, Veranja Karunaratne
Publikováno v:
Journal of Chemical Research. 2008:134-136
Three new butanolides, (2E,3R,4R,9′Z)-2-(dodec-9′-en-11′-ynylidene)-3-hydroxy-4-methylbutanolide (1), (2E,3R,4R)-2-(dodeca-9′,11′-diynylidene)-3-hydroxy-4-methylbutanolide(2),(2E,3R,4R,9′E)-2-(dodeca-9′,11′-dienylidene)-3-hydroxy-4-me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::062b4bdc676c3b5b95a4fb768c69fc81
https://doi.org/10.3184/030823408x298490
https://doi.org/10.3184/030823408x298490
Autor:
Veranja Karunaratne, John K. MacLeod, Vijaya Kumar, Rukmal Ratnayake, B. M. Ratnayake Bandara, Peta Simmonds
Publikováno v:
Journal of Natural Products. 64:376-378
The structures of the butenolides 1 and 2, isolated from the endemic plants Hortonia floribunda, H. angustifolia, and H. ovalifolia, collected in Sri Lanka, have been elucidated by spectroscopic analysis. These compounds exhibited potent mosquito lar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::19c95ec1819e02f0e9f2cb520f4ebe73
https://doi.org/10.1021/np000371t
https://doi.org/10.1021/np000371t
Autor:
Raymond J. Andersen, Gavin Carr, Rukmal Ratnayake, D. Siril. A. Wijesundara, Veranja Karunaratne, B. M. Ratnayake Bandara
Publikováno v:
ChemInform. 39
Three new butanolides, (2E,3R,4R,9′Z)-2-(dodec-9′-en-11′-ynylidene)-3-hydroxy-4-methylbutanolide (1), (2E,3R,4R)-2-(dodeca-9′,11′-diynylidene)-3-hydroxy-4-methylbutanolide(2),(2E,3R,4R,9′E)-2-(dodeca-9′,11′-dienylidene)-3-hydroxy-4-me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3a1ba0d008ee0ac93d029d4474cfbcc
https://doi.org/10.1002/chin.200837197
https://doi.org/10.1002/chin.200837197
Autor:
D. Nedra Karunaratne, Gavin Carr, David E. Williams, D Syril A Wijesundara, Veranja Karunaratne, Raymond J. Andersen, Rukmal Ratnayake, Damith Perera
Publikováno v:
Journal of the National Science Foundation of Sri Lanka. 42:279
The antioxidant activity of MeOH and dichloromethane extracts of the leaves and their alkaloid fractions of the three representative species of the endemic genus Hortonia were evaluated using DPPH radical scavenging bioassay. The results showed that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1fbf5a36da11a2ffbf3ba8fb346af2ee
https://doi.org/10.4038/jnsfsr.v42i3.7402
https://doi.org/10.4038/jnsfsr.v42i3.7402