Development of an easy-to-use, low-cost, household device can help the consumer quickly identify an organophosphorus (OP) residue concentration level. In this work, we demonstrate a 3D-printed, portable, fluorescent-sensing platform for smartphone-capable detection of OPs in vegetables. For development of the proposed device, we utilize the smartphone for capturing the strong thiol-activated fluorescence, which was produced by hydrolysis of OPs in the presence of alkali. The thiol-responsive AIEgen (maleimide-functionalized tetraphenylethylene) was non-emissive in both solution and the solid state but could be readily lighted up by the click addition of thiol to its MI pendant. An android application “Detection” has been developed on the basis of the gray value to analyze the different concentration levels of OPs in vegetable samples. The gray value was linearly related with the concentration of five kinds of organophosphorus residue, ranging from 0 to 20 μg/mL. It was also applied for determination of OPs residue in the leaves of cowpea, celery, and Chinese cabbage. Different from acetylcholinesterase enzyme-based sensors for poor stability under high temperature, the proposed method was a direct detection method for OPs and can be used for rapid monitoring of OPs residue concentration levels before LC-MS analysis.

中文翻译：

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3D 打印、便携式、荧光传感平台，用于智能手机检测有机磷残留物，使用基于反应的聚集诱导发光原

开发易于使用、低成本的家用设备可以帮助消费者快速识别有机磷 (OP) 残留浓度水平。在这项工作中，我们展示了一个 3D 打印的便携式荧光传感平台，用于智能手机检测蔬菜中的有机磷。为了开发所提出的设备，我们利用智能手机来捕获强硫醇激活的荧光，该荧光是在碱存在下通过水解 OP 产生的。硫醇响应型 AIEgen（马来酰亚胺官能化的四苯基乙烯）在溶液和固态下均不发光，但可以通过将硫醇点击添加到其 MI 悬垂物而轻松点亮。开发了一款基于灰度值的安卓应用“检测”，用于分析蔬菜样品中不同浓度水平的OPs。灰度值与五种有机磷残留物的浓度呈线性相关，范围为0～20 μg/mL。也适用于豇豆、芹菜和大白菜叶片中OPs残留量的测定。不同于乙酰胆碱酯酶传感器在高温下稳定性较差，该方法是一种直接检测有机磷的方法，可用于在 LC-MS 分析前快速监测有机磷残留浓度水平。