Polychlorinated biphenyls (PCBs), which cause environmental pollution, are found in animal-based fatty foods. Due to their long half-life and lipophilic properties, they can accumulate in the fat tissues of cattle. The study was conducted to compare the PCB levels (PCB28, 52, 101, 118, 138, 153, and 180) in the different fat tissues (muscle, liver, kidney, spinal cord, lung, back fat, perihepatic fat, and perirenal fat) of cattle by age and gender. This information is also useful to evaluate the exposure risks for different bovine edible tissues. Therefore, 15 female and 15 male cattle under 24 months of age and 15 female and 15 male cattle over 24 months of age were used, and 480 samples were analyzed for target PCBs using gas chromatography-mass spectrometry. Of all the samples, two (50.2 µg/kg in perihepatic fat and 51.1 µg/kg in kidney) were found above the maximum residue limit; these samples were taken from the animals in the elderly female group (over 24 months). There were more PCBs in cattle older than 2 years. Muscle, kidney, and perihepatic fat presented higher PCB concentrations than other tissues, and perirenal fat presented lower PCB concentrations than other tissues. PCB101, PCB153, and PCB138 were found to have the highest contribution to the PCB concentration. Thus, it is concluded that perihepatic fat, muscle, or kidney should be sampled, particularly in routine residue monitoring, and specifically analyzed for PCB101, PCB153, and PCB138.

中文翻译：

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通过年龄和性别测定牛不同脂肪组织中多氯联苯的分布。

在动物性脂肪食品中发现会造成环境污染的多氯联苯（PCB）。由于其长的半衰期和亲脂性，它们可以在牛的脂肪组织中积累。进行这项研究是为了比较不同脂肪组织（肌肉，肝，肾，脊髓，肺，背部脂肪，肝周脂肪和肾周组织）中的PCB水平（PCB28、52、101、118、138、153和180）脂肪）按年龄和性别划分。此信息也可用于评估不同牛可食用组织的暴露风险。因此，使用了24个月龄以下的15头雌性和15头雄性牛以及24个月龄以上的15头雌性和15头雄性牛，并使用气相色谱-质谱法分析了480个样品中的目标PCB。在所有样品中，有两个（肝周脂肪中为50.2 µg / kg，另一个为51。在肾脏中发现1 µg / kg）超过最大残留限量；这些样本取自老年女性组的动物（超过24个月）。大于2岁的牛中的PCBs较多。肌肉，肾脏和肝周脂肪的PCB浓度高于其他组织，而肾周脂肪的PCB浓度则低于其他组织。发现PCB101，PCB153和PCB138对PCB浓度的贡献最大。因此，得出的结论是，应该对肝周脂肪，肌肉或肾脏进行采样，尤其是在常规残留监测中，并对PCB101，PCB153和PCB138进行专门分析。肝周脂肪的PCB浓度高于其他组织，肾周脂肪的PCB浓度低于其他组织。发现PCB101，PCB153和PCB138对PCB浓度的贡献最大。因此，得出的结论是，应该对肝周脂肪，肌肉或肾脏进行采样，尤其是在常规残留监测中，并对PCB101，PCB153和PCB138进行专门分析。肝周脂肪的PCB浓度高于其他组织，肾周脂肪的PCB浓度低于其他组织。发现PCB101，PCB153和PCB138对PCB浓度的贡献最大。因此，得出的结论是，应该对肝周脂肪，肌肉或肾脏进行采样，尤其是在常规残留监测中，并对PCB101，PCB153和PCB138进行专门分析。