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Disposable paper strips for carboxylate discrimination.
Analyst ( IF 3.6 ) Pub Date : 2020-03-24 , DOI: 10.1039/d0an00137f
Yifei Xu 1 , Marco Bonizzoni
Affiliation  

We describe a method for the differentiation of carboxylate anions on disposable paper supports (common printer paper, filter paper, chromatography paper), based on differential patterns of interactions between carboxylates and a fluorescent sensing system. The sensor was built from commercially available components, namely a polycationic fifth generation amine-terminated poly(amidoamine) dendrimer (PAMAM G5) and a small organic fluorophore (calcein) through non-covalent interactions. The assay's physical dimensions were chosen to conform to the microwell plate standard so detection could be carried out on widely available plate reader instrumentation. The sensing complex was first deposited in spots on a paper support to prepare the sensor strip; a carboxylate solution was then loaded on each spot. Nuanced changes in fluorescence were associated with carboxylate binding to the PAMAM dendrimer, characteristic of the structure and affinity of each carboxylate. Such signal changes, interpreted through Linear Discriminant Analysis (LDA), contained enough information to recognize and successfully discriminate most anions in the panel. Among the substrates we tested, chromatography paper was the most promising. The relationship between the structure of the carboxylates and the patterns giving rise to their differentiation was also discussed. Finally, the long-term stability ("shelf life") of the pre-assembled [calcein·dendrimer] sensing system was found to be excellent when deposited on paper support.

中文翻译:

用于识别羧酸盐的一次性纸条。

我们基于羧酸盐和荧光传感系统之间相互作用的不同模式,描述了一种用于在一次性纸质支撑物(普通打印机纸,滤纸,色谱纸)上区分羧酸根阴离子的方法。该传感器由可商购的组件构成,即通过非共价相互作用的聚阳离子第五代胺端基聚(酰胺基胺)树状聚合物(PAMAM G5)和小的有机荧光团(钙黄绿素)。选择测定的物理尺寸以符合微孔板标准,因此可以在广泛使用的酶标仪上进行检测。首先将感测复合物沉积在纸支架上的斑点中,以准备传感器条;然后将羧酸盐溶液加载到每个斑点上。荧光的细微变化与羧酸盐与PAMAM树枝状聚合物的结合,结构特征和每种羧酸盐的亲和力有关。通过线性判别分析(LDA)解释的此类信号变化包含足够的信息,可以识别并成功区分面板中的大多数阴离子。在我们测试的基材中,色谱纸是最有前途的。还讨论了羧酸盐的结构与引起它们分化的图案之间的关系。最后,发现预组装的[钙黄素·树枝状大分子]传感系统的长期稳定性(“保质期”)当沉积在纸质支撑物上时非常出色。通过线性判别分析(LDA)进行了解释,所含信息足以识别并成功区分面板中的大多数阴离子。在我们测试的基材中,色谱纸是最有前途的。还讨论了羧酸盐的结构与引起它们分化的图案之间的关系。最后,发现预组装的[降钙素·树状聚合物]传感系统的长期稳定性(“保质期”)当沉积在纸质支撑物上时非常出色。通过线性判别分析(LDA)进行了解释,所含信息足以识别并成功区分面板中的大多数阴离子。在我们测试的基材中,色谱纸是最有前途的。还讨论了羧酸盐的结构与引起它们分化的图案之间的关系。最后,发现预组装的[钙黄素·树枝状大分子]传感系统的长期稳定性(“保质期”)当沉积在纸质支撑物上时非常出色。还讨论了羧酸盐的结构与引起它们分化的图案之间的关系。最后,发现预组装的[钙黄素·树枝状大分子]传感系统的长期稳定性(“保质期”)当沉积在纸质支撑物上时非常出色。还讨论了羧酸盐的结构与引起它们分化的图案之间的关系。最后,发现预组装的[钙黄素·树枝状大分子]传感系统的长期稳定性(“保质期”)当沉积在纸质支撑物上时非常出色。
更新日期:2020-03-16
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