Journal
TETRAHEDRON
Volume 61, Issue 38, Pages 9001-9006Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2005.07.047
Keywords
Centaurea schischkinii; Asteraceae; afzelin; apigenin; arctigenin; arctiin; astragalin; matairesinol; matairesinoside; schischkiniin; DPPH assay; cytotoxiciy; MTT assay; colon cancer
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Reversed-phase HPLC analysis of the methanol extract of the seeds of Centaurea schischkinii afforded a novel indole alkaloid, named schischkiniin (1), together with four lignans, arctiin (2), matairesinoside (3), matairesinol (4), and arctigenin (5), and three flavonoids, astragalin (6), afzelin (7) and apigenin (8). While the structure of schiskiniin (1) was established unequivocally by UV, HRFABMS and a series of ID and 2D NMR analyses, all known compounds were readily identified by comparison of their spectroscopic data with literature data. The free radical scavenging properties of these compounds were assessed using the DPPH assay, and their general toxicity and cytotoxicity were evaluated, respectively, by brine shrimp lethality and MTT cytotoxicity assays with CaCo-2 colon cancer cell lines. Arctigenin (5) exhibited promising in vitro anticancer activity (IC50=7 mu M) while with schischkiniin (1) the activity was of moderate level (IC50 = 76 mu M). (c) 2005 Elsevier Ltd. All rights reserved.
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