پديد آورندگان :
Zewail Mona نويسنده , Kandi Mahrous نويسنده , El-Shahaat Mohamed نويسنده , El-Marei Abdel-Salam نويسنده
چكيده لاتين :
ABSTRACT
The dissipation of oxamyl, emamectin benzoate, and
imidacloprid pesticide residues in tomato fruits and their
effect on its lycopene content were evaluated. The tested
pesticides were applied according to the recommendation
of the Egyptian Ministry of Agriculture for emamectin
benzoate (Pasha EC 1.9%, 250 cm3
/fedan), imidacloprid
(Confidente SC 35%, 75 cm3
/100L), and oxamyl (Vydate
SL 24%, 3L/fedan). Pesticide residues in tomato fruits
were analyzed using recently developed QuEChERS
method coupled with HPLC. Recovery assays confirmed
the validity and efficiency of QuEChERS with 101, 93, and
110% recovery for oxamyl, emamectin benzoate, and
imidacloprid, respectively. The half-life (t1/2) values for
oxamyl, emamectin benzoate, and imidacloprid in tomato
fruits were 2.88, 3.12, and 3.46 days, respectively. After 12
days from application, the residues of oxamyl, emamectin
benzoate, and imidacloprid in tomato fruits reached 1.0,
0.09, and 0.23 mg/kg, respectively. However, except
imidacloprid, these residue values of oxamyl and
emamectin benzoate were still above the maximal residue
limit (MRL). In addition, the cumulative effects of
imidacloprid and emamectin benzoate have significant
inhibitory effects on the lycopene content compared to
untreated tomato fruits.
INTRODUC