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|Title: ||Protection effect of the anthraquinones, cassiatorin and aurantio-obtusin from seeds of Senna tora against cowpea weevil attack|
|Authors: ||Chi Mbatcho, Valentine|
Dickson, Rita A.
Amponsah, Isaac Kingsley
Mensah, Abraham Yeboah
|Keywords: ||Senna tora|
|Issue Date: ||Feb-2018|
|Publisher: ||Asian Pacific Journal of Tropical Biomedicine|
|Citation: ||Asian Pacific Journal of Tropical Biomedicine , 8(2): 98-105|
|Abstract: ||Objective: To explore the potential insecticidal, ovipositor deterrent and antifeedant effects
of ethyl acetate extract of the seeds of Senna tora (Syn. Cassia tora) against cowpea weevil
(Callosobruchus maculatus). Methods: The activities were evaluated using standard protocols.
In these bioassays, the cowpea seeds were used directly as an insect feed. The activity of the
extract and isolated compounds were tested at concentrations of 100, 200 and 300 µg/mL and
compared to neem oil and cinnamaldehyde (as standard positive controls). Phytochemical
analysis of the ethyl acetate extract was done through a number of chromatographic techniques
and the structures of the isolated compounds were established through comprehensive
spectroscopic analysis including 2D-NMR and ESI-MS studies. Results: Fractionation
of the active ethyl acetate extract resulted in the isolation of one known anthraquinone,
aurantio-obtusin (1) and a novel compound that was named as cassiatorin (2). Compounds
1 and 2 showed comparable insect antifeedant properties with the positive controls while
their insecticidal and ovipositor deterrent effects were far superior to the standard controls.
Conclusions: It is thus concluded that Senna tora extracts and the isolated compounds (1 and
2) may be employed in the postharvest management of stored cowpea seeds and as other crop
|Description: ||This article is published in Asian Pacific Journal of Tropical Biomedicine and also available at doi: 10.4103/2221-1691.225620|
|Appears in Collections:||College of Health Sciences|
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