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(Thymelaeaceae), is a traditional Chinese medicinal herb mainly used for diuretic, antitussive, expectorant, and anticancer effects. However, systematic and comprehensive studies on Flos Genkwa and its bioactivity are limited.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>After confirmation of the anti-tumor activity, the 95% ethanolic extract was subjected to successive solvent partitioning to petroleum ether, dichloromethane, n-butanol, and water soluble fractions. Each fraction was tested using the same biological activity model, and the dichloromethane fraction had the highest activity. The dichloromethane fraction was subjected to further chromatographic separation for the isolation of compounds <jats:bold>1\u201313<\/jats:bold>. Among the 13 compounds, the diterpene esters (compounds <jats:bold>10<\/jats:bold>\u2013<jats:bold>13<\/jats:bold>) showed anticancer activity, whereas the flavonoids, lignanoids, and peptides showed moderate activity. Compound <jats:bold>13<\/jats:bold> was a new daphnane diterpenoid, which was named genkwanin VIII.<\/jats:p>\n            <jats:p>The preliminary antitumor mechanism of yuanhuacine was studied by protein expression and cell cycle analysis in MCF-7 cancer cells.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>The present investigation tends to support the traditional use of Flos Genkwa for treating cancer. Through bioassay-guided fractionation and isolation techniques, the CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub> fraction was determined as the active fraction of the flower buds of <jats:italic>D. genkwa<\/jats:italic>, and the anti-tumor activity was ascribable to the compounds <jats:bold>10\u201313<\/jats:bold>.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1752-153x-7-159","type":"journal-article","created":{"date-parts":[[2013,9,24]],"date-time":"2013-09-24T01:09:18Z","timestamp":1379984958000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["Isolation of anticancer constituents from flos genkwa (Daphne genkwaSieb.et Zucc.) through bioassay-guided procedures"],"prefix":"10.1186","volume":"7","author":[{"given":"Simeng","family":"Li","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guixin","family":"Chou","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Youcheng","family":"Hseu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hsinling","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"HiuYee","family":"Kwan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhiling","family":"Yu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2013,9,23]]},"reference":[{"key":"689_CR1","first-page":"148","volume":"1","author":"CP Commission","year":"2010","unstructured":"Commission CP: Chinese pharmacopoeia. 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