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Res."],"published-print":{"date-parts":[[2017,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Insecticidal effects of the dichloromethane, ethyl acetate, acetone, ethanol and methanol extracts of <jats:italic>Humulus lupulus<\/jats:italic> (hops) L. cones and its principal components, xanthohumol was investigated on five stored pests, <jats:italic>Sitophilus granarius<\/jats:italic> (L.), <jats:italic>Sitophilus oryzae<\/jats:italic> (L.), <jats:italic>Acanthoscelides obtectus<\/jats:italic> (Say.), <jats:italic>Tribolium castaneum<\/jats:italic> (Herbst) and <jats:italic>Lasioderma serricorne<\/jats:italic> (F.). The mortality of adults of the insects treated with 2, 5, 5, 10 and 20 mg ml\u0320<jats:sup>\u22121<\/jats:sup> concentrations of the extracts and xanthuhumol was counted after 24, 48, 72, 96 and 120 h. In order to determine the toxic effects of the substances tested against all tested insects, durations for 50% mortality of the adults, and LD<jats:sub>50<\/jats:sub> values were also determined in the first 48 h by probit analysis. Our results also showed that xanthohumol was more toxic against the pests in comparison with the extracts applications. LD<jats:sub>50<\/jats:sub> values for xanthohumol were found to be low dose as compared with the extracts. Xanthohumol was more toxic against <jats:italic>S. granarius<\/jats:italic> (L.) with 6.8 \u00b5g of LD<jats:sub>50<\/jats:sub> value. Among the extracts, methanol extract was less effective than other extracts against all tested insects. The ethyl acetate extract of <jats:italic>H. lupulus<\/jats:italic> cones was the most effective extract against the tested pests. The quantitative amounts of xanthohumol in the extracts were determined using a high-performance liquid chromatography. The quantitative data indicated that amount of xanthohumol in the extracts increased with increase of polarity of the solvents used from methanol to dichloromethane. The methanol extract contained the high amount of xanthohumol with 5.74 g\/100 g extract (0.46 g\/100 g plant sample).<\/jats:p>","DOI":"10.1017\/s0007485317000256","type":"journal-article","created":{"date-parts":[[2017,3,23]],"date-time":"2017-03-23T02:57:20Z","timestamp":1490237840000},"page":"543-549","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":32,"title":["Insecticidal effects of extracts of <i>Humulus lupulus<\/i> (hops) L. cones and its principal component, 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