PESTICIDES RESIDUES IN TOMATOES, POTATOES AND VINE LEAVES | ||||
| Journal of Food and Dairy Sciences | ||||
| Article 4, Volume 27, Issue 10, October 2002, Page 6873-6884 PDF (3.84 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jfds.2002.256869 | ||||
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| Authors | ||||
| Fatma S. Galal,1; Wafaa A. Hussin1; G. M. Moawad2; Lamyaa EI-S. EI-Sedeak2 | ||||
| 1Home Economics Section, Faculty of Agriculture, Cairo University. | ||||
| 2Plant Protection Research Institute, Agricultural Research Center, Ministry of Agriculture, Giza. | ||||
| Abstract | ||||
| The efficiencies of washing, preparing and cooking as well as time after pesticide spraying in the elimination of some pesticides residues from the treated vegetable were studied. The results indicated some variations in the different used pesticides and treated vegetables. Higher deposits were detected for the use of malathion, pirimiphos-methyl and formothion in vine leaves indicating the relation between the treated surfaces and residues deposits. 'The highest levels of residues were found in vine leaves, while the lowest values were noticed in tomato fruits. The reduction percentages of the used pesticides in tomatoes and vine leaves attained the highest values during the first twenty four hours and tended to decline afterwards. In spite of the high deposits in vine leaves after one hour post spraying, residues of pirimiphos-methyl showed the highest reduction rates, followed by formothion+dimethoate and lately came malathion within the first 24 hours -. The reduction percentage of chlorpyrifos-methyl was also slightly higher than profenofos that of in tomatoes after one day of application. The residues of pesticides continued to decrease with the passage time after treatment as the used pesticide residues in all materials (vine leaves, tomato fruits and potatoes) were greatly reduced by the prolongation of time. Carbaryl residues of potatoes in tuber pit . . persisted relatively long time. The slow rate carbaryl degradation was related to the normal condition of tuber pit and not to its stability. The residue half life values were 23 and 21 hours for chlorpyrifos-methyl and profenofos in tomato fruits, respectively. While these values were 17, 13 and 16 hours for malathion, pirimiphos-methyl and formothion+ dimethoate -:i1 vine leaves in respective order. This value was 140 for carbaryl in potatoes in tuber pit condition. Tomatoes could be marketed after 3 days when treated with chlorpyrifos-methyl and 10 days in case of profenofos spraying. Vine leaves could be marketed after 6 days post malathion or pirimiphos-methyl but 10 days following formothion application. Carbaryl used for dusting should not be recommended for human consumption but only for protection potatoes for the new season cultivation. Washing was efficient in partial elimination of the pesticide residues from tomatoes and vine leaves after one day post application. Thoroughly washing of potatoes treated with carbaryl removed most of the initial residues deposit after one hour post treatment. Boiling vine leaves and concentrating tomato juice for making tomato paste resulted in complete elimination of the used pesticide residues on the third day after spraying. Cooking either by boiling or frying and/or combined with washing and peeling totally removed carbaryl residues from the dusted potatoes even at the initial time. | ||||
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