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Smartphone-based fluorescence detection of bisphenol A from water samples

机译：基于智能手机的水样中双酚A荧光检测

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摘要

Bisphenol A (BPA), an emerging environmental contaminant and endocrine disrupting compound, has been observed globally in surface water and waste leachates at concentrations that are hazardous to aquatic life and potentially to humans. Limitations in field monitoring on account of the extensive laboratory infrastructure required for standard BPA detection warrants investigation into portable or handheld sensing platforms. In this work, we evaluated a standalone smartphone-based fluorescence sensing method for identifying BPA from water samples. Toward this goal, we demonstrated the novel application of 8-hydroxypyrene-1,3,6-trisulfonic acid (HPTS) as a fluorescent probe with suitable specificity to BPA compared to functionally and structurally similar hormone and endocrine disrupting compounds. Using this method, bisphenol A was quantifiable through both standard fluorescence spectroscopy and smartphone detection, with an empirical binding constant of KSV = 2040 M?1 and a direct, unfiltered detection limit of 4.4 μM from unprocessed samples, suitable for waste leachate and industrial samples. Implementation of further digital image processing and smartphone spectroscopy methods may help to lower this detection limit, bearing promise for future direct detection of bisphenol A from wastewater leachate and environmental samples via smartphones.
机译：双酚A（BPA）是一种新兴的环境污染物和破坏内分泌的化合物，已在全球范围内从地表水和废物浸出物中观察到，其浓度对水生生物和人类均有害。由于标准BPA检测需要广泛的实验室基础设施，因此现场监控的局限性使得需要对便携式或手持式传感平台进行调查。在这项工作中，我们评估了一种基于智能手机的独立荧光传感方法，用于从水样中鉴定BPA。为了达到这个目标，我们证明了8-羟基py-1,3,6-三磺酸（HPTS）作为荧光探针的新颖应用，与功能和结构类似的激素和内分泌干扰化合物相比，对BPA具有合适的特异性。使用该方法，可通过标准荧光光谱法和智能手机检测对双酚A进行定量，其经验结合常数为 K SV = 2040 M < small> ？1 ，未处理样品的直接未经过滤的检测限为4.4μM，适用于垃圾渗滤液和工业样品。进一步数字图像处理和智能手机光谱方法的实施可能有助于降低该检测极限，为将来通过智能手机从废水渗滤液和环境样品中直接检测双酚A提供了希望。

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