开发了包封在沸石咪唑酯框架8(CeO2@ZIF-8/Apt)中的BPA适体功能化的氧化铈纳米颗粒,以制造用于现场定量检测BPA的一体化便携式平台。通过将生物复合材料与3,3'结合起来,基于5,5'-四甲基联苯胺(TMB)的海藻酸钠(SA)水凝胶和基于智能手机的RGB分析,实现了对双酚A的高度敏感和方便的监测。CeO2@ZIF-8复合材料是使用新型表面活性剂改性的浓度控制合成策略构建的。用BPA适体功能化后,使用CeO2@ZIF-8/Apt生物复合材料作为目标响应比色探针进行目标识别和信号转导。CeO2@ZIF-8的氧化酶样活性被BPA适体有效密封,并通过适体-BPA反应以浓度依赖性方式可控释放。利用瓶盖中含有TMB的SA水凝胶,一步样品添加和一锅检测可以方便地实现,并通过基于智能手机的RGB分析以免仪器的方式可靠地定量。该便携式检测平台的检测范围为50pg/mL至500ng/mL,检出限为34.88pg/mL,与溶液系统中的常规检测(4.57pg/mL)相当。在自来水中的回收,苹果汁,牛奶占91.02%和106.75%。这项工作为在资源受限地区进行污染物监测的一体化检测平台的设计提供了新的见解。
BPA aptamers functionalized cerium oxide nanoparticles encapsulated in zeolitic imidazolate framework-8 (CeO2@ZIF-8/Apt) were developed to fabricate an all-in-one portable platform for on-site quantitative detection of BPA. By combining biocomposites with a 3,3\',5,5\'-tetramethylbenzidine (TMB)-based sodium alginate (SA) hydrogel and smartphone-based RGB analysis, highly sensitive and convenient monitoring of BPA was achieved. CeO2@ZIF-8 composites were constructed using a novel surfactant-modified concentration-controlled synthesis strategy. After being functionalized with BPA aptamers, CeO2@ZIF-8/Apt biocomposites were used as target-response colorimetric probes for target recognition and signal transduction. The oxidase-like activity of CeO2@ZIF-8 was effectively sealed by BPA aptamers and controllably released in a concentration-dependent manner through aptamer-BPA reactions. Utilizing SA hydrogels containing TMB in the caps, a one-step sample addition and one-pot detection can be conveniently achieved and reliably quantified by smartphone-based RGB analysis in an instrument-free way. The detection range of this portable detection platform is 50 pg/mL to 500 ng/mL with limit of detection calculated as 34.88 pg/mL, comparable to that of conventional detection in the solution system (4.57 pg/mL). The recoveries in tap water, apple juice, and milk ranged from 91.02 % and 106.75 %. This work contributes new insights into the design of all-in-one detection platforms for contaminants monitoring in resource-constrained regions.