Now showing items 1-10 of 17
Interactions of melatonin and its metabolites with the ABTS cation radical: extension of the radical scavenger cascade and formation of a novel class of oxidation products, C2-substituted 3-indolinones
Melatonin had previously been shown to reduce up to four 2,2- azino-bis-(3-ethylbenzthiazoline-6-sulfonic acid) cation radicals (ABTS•+) via a scavenger cascade ending with N1 -acetyl-N2 -formyl-5- methoxykynuramine ...
Panduratins D—I, Novel Secondary Metabolites from Rhizomes of Boesenbergia pandurata
Investigation of the non-polar fraction of Boesenbergia pandurata of Myanmar led to the identification of six novel secondary metabolites, panduratins D—I (1—6), together with known diastereomers, panduratins B1 (7) and ...
Novel anticancer agents, kayeassamins C I from the flower of Kayea assamica of Myanmar
A CHCl3-soluble fraction of 70% EtOH extract of the flower of Kayea assamica from Myanmar exhibited 100% preferential cytotoxicity (PC100) against human pancreatic cancer PANC-1 cells under nutrient-deprived conditions ...
C-Prenylflavonoids from Derris heyneana
2′,4′-Dihydroxy-3′-(3-methylbut-2-enyl)-4-methoxychalcone (1) and three known C-prenylflavonoids, namely, lupinifolin (flemichin B), hiravanone, and derrubone were isolated from the leaves of Derris heyneana (Febaceae). ...
Reactions of the melatonin metabolite N1-acetyl-5- methoxykynuramine (AMK) with the ABTS cation radical: identification of new oxidation products
The melatonin metabolite N1 -acetyl-5-methoxykynuramine (AMK; 1), which was previously shown to be a potent radical scavenger, was oxidized using the ABTS cation radical [ABTS = 2,2′-azinobis-(3-ethylbenzthiazoline-6-s ...
Sesquiterpene Lactones from Elephantopus scaber
The whole plant of Elephantopus scaber afforded the known deoxyelephantopin and isodeoxy-elephantopin, and a new germacranolide sesquiterpene lactone named scabertopin, whose structure and stereo-chemistry were determined ...
Niruriflavone, a new Antioxidant Flavone Sulfonic Acid from Phyllanthus niruri
A new flavone sulfonic acid 1 named niruriflavone was isolated from the 70% ethanolic extract of the whole plant of Phyllanthus niruri (Euphorbiaceae), together with 6,10,14-trimethyl-2- pentadecanone, hypophyllanthin, ...
A new cardenolide from the roots of Streptocaulon tomentosum
A new cardenolide, (17 alpha)-H-periplogenin-3-O-beta-D-glucopyranosyl-(1-4)-2-O-acetyl-3-O-methyl-beta-fucopyranoside (1), was isolated from the roots of Streptocaulon tomentosum.