Xu Jiaping, Bi Wanjuan, Hua Liting, Cheng Zhipeng, Wang Yu, Li Dandan, Liu Weitao, Wang Lei, Sun Hongwen
MOE Key Laboratory on Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
MOE Key Laboratory on Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Chemosphere. 2022 Nov;307(Pt 2):135847. doi: 10.1016/j.chemosphere.2022.135847. Epub 2022 Aug 6.
Plastics are widely used as packaging and engineering materials in feed processing, which leads to the potential contamination of plasticizers and microplastics (MPs) in animal feeds. In this study, the concentrations of two typical MPs, i.e., polyethylene terephthalate (PET) and polycarbonate (PC), and seven phthalates (PAEs) as well as their corresponding monoester metabolites (mPAEs) in 45 pig feed samples in China were analyzed by mass spectrometers. Among PAEs, dibutyl phthalate (DBP) and bis(2-ethylhexyl) phthalate (DEHP) were detected in all samples, and DEHP showed the highest concentrations of 8.26-2464 μg/kg, which accounted for 65.6% of the total detected PAEs. PET MPs (<MDL-302 μg/kg) were detected in 97.8% of samples. Meanwhile, mPAEs were also detected in feed samples with high detection rates but of much lower concentrations. A significantly positive correlation was observed between DEHP and PET MPs. This indicates that the sources of DEHP and MPs in feeds are homologous, mainly from processing and packaging. Besides, the significantly positive correlations between DBP/DEHP and mBP/mEHP indicated the degradation of PAEs to mPAEs during feed production and transportation. The estimated daily intake (EDI) of PAEs and PET MPs were 2.40-70.3 and 0.800-7.79 μg/kg-bw-day, respectively. The results of this study provided new insight into the first evidence of the co-occurrence and risk of MPs, PAE, and mPAEs in pig feed.
塑料在饲料加工中被广泛用作包装和工程材料，这导致动物饲料中存在增塑剂和微塑料（MPs）污染的潜在风险。本研究采用质谱仪分析了中国45份猪饲料样品中两种典型微塑料，即聚对苯二甲酸乙二酯（PET）和聚碳酸酯（PC），以及七种邻苯二甲酸酯（PAEs）及其相应的单酯代谢物（mPAEs）的浓度。在PAEs中，所有样品均检测到邻苯二甲酸二丁酯（DBP）和邻苯二甲酸二（2-乙基己基）酯（DEHP），DEHP的浓度最高，为8.26 - 2464 μg/kg，占检测到的总PAEs的65.6%。97.8%的样品中检测到PET微塑料（<MDL - 302 μg/kg）。同时，饲料样品中也检测到了mPAEs，检出率较高，但浓度低得多。观察到DEHP与PET微塑料之间存在显著正相关。这表明饲料中DEHP和微塑料的来源相同，主要来自加工和包装。此外，DBP/DEHP与mBP/mEHP之间的显著正相关表明，在饲料生产和运输过程中PAEs降解为mPAEs。PAEs和PET微塑料的估计每日摄入量（EDI）分别为2.40 - 70.3和0.800 - 7.79 μg/kg-bw-day。本研究结果为猪饲料中微塑料、PAE和mPAEs的共存及风险提供了首个证据，提供了新的见解。
