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Tissue Distribution, Maternal Transfer, and Age-Related Accumulation of Dechloranes in Chinese Sturgeon
journal contribution
posted on 2012-09-18, 00:00 authored by Hui Peng, Kun Zhang, Yi Wan, Jianying HuWhile dechloranes have been detected in environmental media and
wildlife, limited information was available on their tissue distribution
in wildlife. Syn-dechlorane plus (syn-DP), anti-DP, syn-undecachloropentacyclooctadecadiene
(syn-Cl11DP), anti-Cl11DP, dechlorane 602, dechlorane 603 and mirex were measured
in 13 organs of 17 female Chinese sturgeon (Acipenser sinensis). Dechloranes were detected in all tissues and the highest concentrations
of total dechloranes were detected in heart (87 pg/g ww, 4.5–645
pg/g ww), followed by adipose (61 pg/g ww, 14–531 pg/g ww)
and eggs (57 pg/g ww, 13–261 pg/g ww). The tissue distribution
of DP was mainly determined by lipid partition, while Dec 602 and
Dec 603 preferred to accumulate in the intestine and stomach. The
values of fanti (the concentration of
anti-DP relative to the sum concentration of DP) in maternal tissues
(0.72 ± 0.03 in muscle) were significantly higher than those
found in eggs (0.65 ± 0.04) (p < 0.001),
while fanti‑Cl11DP (the concentration
of anti-Cl11DP relative to the sum concentration of Cl11DP) in maternal tissues (0.59 ± 0.10 in muscle) was
significantly lower than that in eggs (0.75 ± 0.13) (p < 0.05). High maternal transfer efficiencies of dechloranes
were observed in eggs, which accounted for 49% of the total body burden,
and the ratios of concentrations in eggs to maternal tissues (EMR)
for mirex, Dec 602, Dec 603, syn-Cl11DP, anti-Cl11DP, syn-DP, and anti-DP were 18, 8.8, 5.2, 2.6, 5.2, 5.5 and 3.7, respectively,
which are dependent on their KOW values (r = −0.66, p < 0.01). Negative
age-related trends were observed for mirex, Dec 603, syn-Cl11DP and anti-Cl11DP in
eggs (R2 = 0.28–0.38, p = 0.02–0.05), which were possibly due to their high transfer
efficiencies to eggs from maternal body (49%).