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Parasitology Research

, Volume 107, Issue 5, pp 1235–1240 | Cite as

Mosquito larvicidal activities of Solanum nigrum L. leaf extract against Culex quinquefasciatus Say

  • Anjali Rawani
  • Anupam Ghosh
  • Goutam Chandra
Original Paper

Abstract

The present study was carried out to establish the larvicidal activities of crude and solvent extracts of Solanum nigrum L. leaves against Culex quinquefasciatus Say as target species. The results indicated that the mortality rates at 0.5% concentration were highest amongst all concentrations of the crude extracts tested against all the larval instars at 24, 48 and 72 h of exposure. Result of log probit analysis (at 95% confidence level) revealed that lethal concentration LC50 and LC90 values gradually decreased with the exposure periods in bioassay experiment with the crude plant extract. The results of regression analysis of crude extract of S. nigrum revealed that the mortality rate is positively correlated with the concentration of the extracts. Mature leaves of S. nigrum were also extracted with six different solvents [viz. petroleum ether, benzene, ethyl acetate, chloroform: methanol (1:1 v/v), acetone and absolute alcohol] to determine the best extractant for subsequent isolation and characterization of active ingredient. Mortality rate with ethyl acetate extract was significantly higher (p < 0.05) than other extracts when 50-ppm doses were used. The corresponding LC50 value of acetone, absolute alcohol, petroleum ether, chloroform: methanol (1:1 v/v), benzene and ethyl acetate extracts were 72.91 ppm, 59.81 ppm, 54.11 ppm, 32.69 ppm, 27.95 ppm and 17.04 ppm, respectively, after 24 h of exposure period. Results of this study show that the ethyl acetate extract of S. nigrum may be considered as a potent source of a mosquito larvicidal agent.

Keywords

Crude Extract Ethyl Acetate Extract Larvicidal Activity Polarity Index Absolute Alcohol 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors acknowledge with thanks the financial help of DST, New Delhi, which has been extended through DST-funded Major Research project (D.O.No.SR/SO/HS/84/2007, dated: 08/02/2008).

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Mosquito and Microbiology Research Units, Parasitology Laboratory, Department of ZoologyThe University of BurdwanBurdwanIndia

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