Residues of pirimiphos-methyl and fenitrothion in grapes, their effect on some quality properties and their dissipation during the removal and processing methods | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 9, Issue 3, December 2009, Pages 89-107 PDF (428.05 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2009.459631 | ||
| Authors | ||
| Mohamed A. Radwan* ; Mohamed H. Shiboob; Adel Abdel-Aal; Mahmoud M. Abu-Elamayem | ||
| Pesticide Chemistry Department, Faculty of Agriculture (El-Shatby), University of Alexandria, Alexandria, Egypt. | ||
| Abstract | ||
| The persistence patterns of the two organophosphorus insecticides; pirimiphos-methyl and fenitrothion in leaves and fruits of grapes in relation to their effects on some internal quality properties were studied. In addition, the elimination of the two insecticide residues contaminating grapes through the use of washing or home processing methods was also investigated. The results showed that waiting period of 21 days after application on grapes is enough to reduce the pirimiphos-methyl or fenitrothion residues to below the maximum residue limits (MRL). However, pirimiphos-methyl appeared longer persistent with t₁/₂ of 5.4 and 4.4 days than fenitrothion with t₁/₂ of 3.2 and 2.8 days for fruits and leaves, respectively. Results also showed that washing treated fruits with any of the tested washing of solutions removed considerable amounts of such residues. Blanching of grape leaves, removed 77.19% and ~100% of the initial residues of pirimiphos-methyl and fenitrothion, respectively. Grape processing into raisins or juice caused almost complete residue reduction (~100% removal for each insecticide). As for the internal quality parameters of grape fruits, the tested insecticides had significantly increased total soluble sugars. Pirimiphos-methyl significantly increased % acidity, decreased pH of the grape juice and did not produce any significant effect on the % fatty acids. On the other hand, fenitrothion significantly decreased % acidity and also did not cause any effect on the tested fatty acids except linoleic acid in grape fruits which was increased. | ||
| Keywords | ||
| Pirimiphos-methyl; fenitrothion; insecticides; grapes; fruit quality; removal | ||
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