New Zealand Journal of Agricultural Research abstracts
Short communication
Residual profile of DDT in egg yolks of laying hens
following an oral application
N. FURUSAWA
Y. MORITA
Faculty of Human Life Science
Osaka City University
Osaka 558-8585, Japan
Abstract Laying hens were treated orally with a single dose
of DDT 1 mg kg-1 (body weight). Concentrations (μg
g-1) of DDT and its metabolites, DDE and DDD, in egg yolks laid for
21 days after the DDT treatment were determined by normal-phase
high-performance liquid chromatography. After the DDT treatment, DDT residues
were found in the yolk on the second day while DDE was present after 2-4 days.
No DDD was detected (<0.03 μg g-1). The highest levels of DDT
(mean 0.52 μg g-1) and DDE (mean 0.11 μg g-1) were
observed on the fifth and sixth days, respectively. DDT and DDE levels then
decreased slowly and were still detected to the twenty-first day. The
half-lives of DDT and DDE in egg yolks were estimated to be 7.6 and 12.8 days,
respectively. In the egg yolk, the decrease of the metabolite, DDE, was slower
than that of DDT (P < 0.05). The present data would be useful in
judging the duration of residues of the DDTs in eggs.
Keywords DDT; DDE; single dose; laying hens; egg yolks
New Zealand Journal of Agricultural Research, 2001, Vol. 44: 297-300
0028-8233/01/4404-0297 $7.00/0 (c) The Royal Society of New Zealand
2001
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