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Antifeedant and ovicidal activities of a new cassane and other compounds from Caesalpinia welwitschiana Oliv. and Caesalpinia bonduc L. against Tuta absoluta (Lepidoptera: Gelechiidae)
Natural Product Research ( IF 2.2 ) Pub Date : 2020-09-28 , DOI: 10.1080/14786419.2020.1825424
Flaure Rosette Ehawa Essoung 1, 2, 3 , Brice Mitterant Mba'ning 4 , Alain Tadjong Tcho 5 , Sumesh Chander Chhabra 3 , Samira Abuelgasim Mohamed 2 , Bruno Ndjakou Lenta 6 , Silvere Augustin Ngouela 7 , Etienne Tsamo 4 , Ahmed Hassanali 3 , Russell John Cox 8
Affiliation  

Abstract

Methanolic extracts of liana of Caesalpinia welwitschiana and leaves of C. bonduc were found to possess moderate antifeedant and ovicidal activities against Tuta absoluta. Bioassay-guided isolation of constituents from the most active fraction of C. welwitschiana led to the identification of four known compounds [isobonducellin 1a and bonducellin 1 b, intricatinol 2, (-)-epigallocatechin-3-O-gallate 4] and one new constituent [welwitschianic acid 3]. The most active fraction of C. bonduc afforded two known constituents neocaesalpin L 5 and neocaesalpin A 6. The isolated structures were elucidated on the basis of their MS, UV, IR and 1 & 2 D NMR spectra and by comparison with literature data. Compounds 2, 4-6 were showed antifeedant and ovicidal properties against T. absoluta, some comparable to that of azadirachtin at 50, 100 and 200 ng/µl. Overall, the present study, conclude that the two species of the plant could be a promising source of eco-friendly botanical constituents.



中文翻译:

来自 Caesalpinia welwitschiana Oliv 的新 cassane 和其他化合物的拒食和杀卵活性。和 Caesalpinia bonduc L. 对抗 Tuta absoluta(鳞翅目:Gelechiidae)

摘要

发现Caesalpinia welwitschiana藤本植物和C. bonduc叶子甲醇提取物对Tuta absoluta具有中度拒食和杀卵活性。从C. welwitschiana最活跃部分的成分的生物测定指导分离导致鉴定了四种已知化合物 [isobonducellin 1a和 bonducellin 1b , intricatinol 2 , (-)-epigallocatechin-3- O - gallate 4 ] 和一种新化合物成分 [月香酸3 ]。C. bonduc最活跃的部分提供了两种已知成分 Neocaesalpin L 5和新凯叶松 A 6。基于它们的 MS、UV、IR 和 1 维和 2 维 NMR 光谱并与文献数据进行比较,阐明了分离的结构。化合物24 - 6分别显示出对拒食和杀卵性能T. absoluta,一些比得上印楝素在50,100和200毫微克/微升。总体而言,本研究得出的结论是,这两种植物可能是生态友好型植物成分的有希望的来源。

更新日期:2020-09-28
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