International Journal of Tropical Insect Science

, Volume 13, Issue 6, pp 775–779 | Cite as

Chemical Additives that Affect the Potency of Endotoxin of Bacillus Thuringiensis Against Plodia Interpunctella

  • A. El-Moursy
  • R. Aboul-Ela
  • H. S. Salama
  • A. Abdel-Razek
Research Article


Biochemical approaches have been used to enhance the potency of of Bacillus thuringiensis against Plodia interpunctella. Tests were made with different classes of chemical compounds, characterized by being safe, non-toxic to man, and cheap in price. Among the tested inorganic salts, calcium carbonate, calcium oxide and zinc sulphate were found to increase the potency of B. thuringiensis δ-endotoxin by 2.5-, 1.9- and 2.7- fold, respectively. With the nitrogenous compounds, the amino acids serine, arginine, alanine and leucine enhanced the endotoxin effect by 5.2-, 3.6-, 1.3-and 1.1-fold, respectively. Also, among the protein solubilizing agents, EDTA and sodium thioglycollate led to a 100- and 2.6-fold Increase in the potency. Formic acid was highly effective among the organic acids used in enhancing the potency, followed by malic acid, with 4.8- and 2.4-fold increase, respectively.

Key Words

Additives potency Bacillus thuringiensis Plodia interpunctella 


Une approche bio-medical a été utilisé pour améliorer la puissance de Bacillus thuringiensis contre la mitte Indienne Plodia interpunctella. Des analyses ont été faites avec des classes de composition chimique characterise par leur aspect sain. Entre les sels analyses le carbonate de calcium et l’oxide de calcium et la sulphate de zinc ont augmenté la puissance de B. thuringiensis δ-endotoxin par 2, 5, 2, 7 et 1, 9, respectivement Avec les composition (azotique) les acide amino, la serine, l’arginine, l’alanine et le leucine ont améliore l’effet par par 5, 2, 3, 6, 1, 1 et 1, 3 respectivement Aussi avec les agents de soiubilisation de proteine, EDTA et le thioglycollate de sodium ont augmenté la puissance par 100- et 2, 6 fois. L’acide fourmique a été très efficace parmi les acides organiques qui ont été utilise pour améliorer la puissance suivi par l’acid malie par 4, 8 et 2, 4 fois, respectivement


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Copyright information

© ICIPE 1992

Authors and Affiliations

  • A. El-Moursy
    • 1
  • R. Aboul-Ela
    • 1
  • H. S. Salama
    • 2
  • A. Abdel-Razek
    • 2
  1. 1.Faculty of ScienceCairo UniversityCairoEgypt
  2. 2.National Research CentreDokki, CairoEgypt

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