Journal
JOURNAL OF STORED PRODUCTS RESEARCH
Volume 41, Issue 4, Pages 433-443Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jspr.2004.07.001
Keywords
triterpenes; oleanolic acid; toxic effects; antifeedants; Sitophilus oryzae; Junellia aspera
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Triterpenes from Junellia aspera (Gillies ex Hook) (Verbenaceae) and chemical derivatives were evaluated for their antifeedant and toxic effects against adults of Sitophilus oryzae (L.). Five triterpenoids were acutely toxic by ingestion. The compounds maslinic acid (11), daucosterol (111), and 3 beta-hydroxy-12 alpha-bromine-(28 -> 13)-oxide-oleanane (IX) showed the highest toxic effects, while oleanolic acid (I) and oleanonic acid (VII) showed less toxicity. Daucosterol also exhibited important feeding deterrence activity. No toxicity was observed when the assayed compounds were topically applied. (c) 2004 Elsevicr Ltd. All rights reserved.
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