Synthesis of some N-benzylphosphoryl chitosan derivatives and their fungicidal and insecticidal activity | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 13, Issue 2, December 2005, Pages 43-56 PDF (769.23 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2005.459538 | ||
| Authors | ||
| Mohamed E. I. Badawy* 1; Entsar I. Rabea2 | ||
| 1Department of Pesticide Chemistry, Faculty of Agriculture,El-Shatby, Alexandria University, Egypt | ||
| 2Department of Pest Control and Environmental Protection; Faculty of Agriculture, Damanhour, Alexandria University, Egypt | ||
| Abstract | ||
| A series of some water-soluble N-benzy)phosphoryl chitosan (NBPC) derivatives were synthesized by reaction of chitosan with aldehydes and phosphorus acid. Chemical identification was confirmed by IH- and 31P-NMR spectroscopy. Their biological activities were tested against economic fungus of the grey mould, Botrytis cinerea, and insect of the cotton leafeworm, Spodoptera littoralis. In a radial growth fungicidal bioassay, all of the synthetic compounds were about 6 times more potent than natural chitosan. Substitution with 0-nitro group on the phenyl ring showed the highest activity (EC50 = 0.04%), whereas substitution with p-cyano was the lowest one (EC50 = 0.19%). In feeding bioassay, the insecticidal activity was screened against third-instar larvae Of the cotton leafworm, S littoralis, at 0.5 % (w/w) in the artificial diet and the most active compound was also N(0-nitrobenzylphosphoryl) chitosan. | ||
| Keywords | ||
| N-benzylphosphoryl chitosan derivatives; IH- and 3 IP-NMR spectroscopy; fungicidal activity; insecticidal activity; Botrytis cinerea; Spodoptera littoralis | ||
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