National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, 76080, Pakistan.
Department of Electrical Engineering, NED University of Engineering & Technology, Karachi, 75270, Pakistan.
Environ Sci Pollut Res Int. 2017 Aug;24(22):18663-18671. doi: 10.1007/s11356-017-9470-y. Epub 2017 Jun 25.
Phthalate esters (PAEs) are mainly used as plasticizers, and their release in the environment during the manufacturing, use, and disposal has caused serious environmental health concerns, since some of them are suspected to be mutagens, hepatotoxic agents, and carcinogens. In the present study, leaching of PAEs from different drinking stuffs (water cooler, mineral water bottles) exposed to sunlight and baby feeders subjected to different heating treatments (boiling, autoclave and oven) was studied. Results showed that a total of 10 PAEs were leached and identified. Among them, dimethyl phthalate, bis(2-methoxyethyl) phthalate, diethyl phthalate, and dibutyl phthalate were the major leached PAEs found in the range 9-112.50 μg L. Boiling treatment was found safer for baby feeders as PAE leaching was ~26-54% less as compared to other two treatments. The leached PAEs in water samples were then subjected to biodegradation experiment with Bacillus thuringiensis strain at optimized conditions (time 72 h and 30 °C). Hence, leaching of hazardous PAEs from different water stuffs is alarming and needs immediate attention. Moreover, B. thuringiensis strain was found effective for PAE remediation (75-96% degradation) at neutral pH. Graphical abstract ᅟ.
邻苯二甲酸酯（PAEs）主要用作增塑剂，它们在制造、使用和处置过程中释放到环境中，引起了严重的环境健康问题，因为其中一些被怀疑是诱变剂、肝毒物和致癌物。本研究研究了不同饮料（冷水器、矿泉水瓶）在暴露于阳光下和婴儿喂养器在不同加热处理（煮沸、高压灭菌和烤箱）下 PAEs 的浸出情况。结果表明，共浸出并鉴定了 10 种 PAEs。其中，二甲酸酯、双（2-甲氧基乙基）邻苯二甲酸酯、邻苯二甲酸二乙酯和邻苯二甲酸二丁酯是在 9-112.50μg/L 范围内发现的主要浸出 PAEs。与其他两种处理方法相比，煮沸处理对婴儿喂养器更安全，因为 PAE 的浸出量减少了约 26-54%。水样中的浸出 PAEs 随后在优化条件（72 h 和 30°C）下用苏云金芽孢杆菌进行生物降解实验。因此，从不同水制品中浸出有害的 PAEs 令人震惊，需要立即引起关注。此外，苏云金芽孢杆菌在中性 pH 值下对 PAE 修复（75-96%降解）有效。
