Suppressive effect of polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans and dioxin-like polychlorinated biphenyls transfer from feed to eggs of laying hens by activated carbon as feed additive

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• 作者：Hiroyuki Fujita^a ; ^{mrfujita@agr.ehime-u.ac.jp} ; Katsuhisa Honda^a ; Ryoji Iwakiri^b ; Keerthi S. Guruge^c ; ^{guruge@affrc.go.jp} ; Noriko Yamanaka^c ; Nobuhiko Tanimura^c
• 关键词：PCDDs/PCDFs and dioxin like-PCBs (DL-PCBs) ; Laying hen egg ; Feed additive ; Activated carbon ; Microwave assisted extraction ; Automated purification
• 刊名：Chemosphere
• 出版年：2012
• 期刊代码：15_00456535
• 类别：env
• 出版时间：August, 2012
• 卷：88
• 期：7
• 页码：820-827
• 文件大小：800 K

摘要

In this study, we investigated the suppressive effect of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and dioxin-like polychlorinated biphenyls (DL-PCBs) transfer from the feed to the eggs of laying hens by using activated carbon as a feed additive. Four groups of six hens (White Leghorn egg-layers; age, 11 weeks) were housed as two control groups and two exposure groups for a period of 20 weeks. Two control groups were fed with either the basal feed 鈥淐ontrol鈥?or basal feed additing activated carbon 鈥淐ontrol + C鈥? Another two exposure groups were fed with feed contaminated (about 6 ng TEQ kg^鈭? feed) by standard solutions of PCDDs/PCDFs and DL-PCBs 鈥淓xposure鈥?alone and contaminated feed adding activated carbon 鈥淓xposure + C鈥? There was no significant effect on each groups for the growth rate, biochemical blood components, and egg production: these were around the standard levels for poultry in general. Moreover the results in this study showed the availability of activated carbon as a feed additive owing to the reduction in the risk of food pollution by PCDDs/PCDFs and DL-PCBs. The concentration in the eggs of the Exposure group gradually increased following the start of egg-laying but reached a steady state after about 1 month. In contrast, the concentration for the Exposure + C group was stationary and below the maximum EU level (6 pg TEQ g^鈭? fat). In comparison to the Exposure group, the Exposure + C group showed a significant decline in the percentage of bioaccumulation into the egg. This reduction due to activated carbon was also observed in the muscle and abdominal fat. The reductions were compound- and congener-dependent for DL-PCBs as follows: PCDDs/PCDFs, non-ortho-PCBs, and mono-ortho-PCBs were more than 90%, 80%, and 50%, respectively, irrespective of the type of tissues. Fat soluble vitamin concentrations in the eggs of the Exposure + C group showed lower trends than the Exposure group. The 纬-tocopherol and 伪-tocopherol concentrations in eggs of Exposure + C group showed a significant reduction of about 40%. However, the addition of activated carbon into animal feed could obviate the remote potential for accidents causing unintentional food pollution with PCDDs/PCDFs and DL-PCBs.