SensorLab, Department of Chemistry, University of the Western Cape, Bellville 7535, Cape Town, South Africa.
SensorLab, Department of Chemistry, University of the Western Cape, Bellville 7535, Cape Town, South Africa.
Talanta. 2019 May 1;196:204-210. doi: 10.1016/j.talanta.2018.12.038. Epub 2018 Dec 13.
A sensitive dendritic star copolymer-based sensor for pyrene (PY), was developed by in situ electrosynthesis of generation 3 poly(propylene thiophenoimine)-co-poly(3-hexylthiophene) (G3PPT-co-P3HT) on a gold disk electrode (Au). The electrochemical reactivity and the signal transduction properties of the Au|G3PPT-co-P3HT co-polymer electrode were studied by second harmonic alternating current voltammetry (SHACV) and alternating current voltammetry (ACV), respectively. SHACV analysis confirmed the occurrence of Faradaic electrode process (with a standard rate constant, k value of 3.36 cm s), possibly originating from the surface-confined thiophene groups of the co-polymer electrode. The ACV responses of the Au|G3PPT-co-P3HT electrode to pyrene gave a linear range (LR) of 2.73-26.86 nM and a limit of detection (LOD) of 1.34 nM PY. The low LOD value suggests that the PY sensor has promise for monitoring compliance to the World Health Organization (WHO) approved limit for polyaromatic hydrocarbons (PAHs) in wastewater, which is 3.93 nM. The sensor was used to determine PY levels in oil-polluted wastewater samples, which were found to contain 4.93-23.49 nM PY, depending on how far into the sea the samples were collected. The high recovery rate obtained for the oil-polluted seawater samples, indicate that ACV signalling protocol makes the Au|G3PPT-co-P3HT electrode very suitable for application in samples that have complex matrices.
一种基于敏感树枝状星型共聚物的芘 (PY) 传感器，是通过在金盘电极 (Au) 上原位电化学合成第三代聚 (丙烯噻吩亚胺) - 共 - 聚 (3-己基噻吩) (G3PPT-co-P3HT) 来制备的。通过二次谐波交流伏安法 (SHACV) 和交流伏安法 (ACV) 分别研究了 Au|G3PPT-co-P3HT 共聚物电极的电化学反应性和信号转导特性。SHACV 分析证实了 Faradaic 电极过程的发生 (具有标准速率常数 k 值为 3.36 cm s)，可能源自共聚物电极的表面受限噻吩基团。Au|G3PPT-co-P3HT 电极对芘的 ACV 响应给出了 2.73-26.86 nM 的线性范围 (LR) 和 1.34 nM PY 的检测限 (LOD)。低 LOD 值表明，该 PY 传感器有望用于监测世界卫生组织 (WHO) 批准的废水中多环芳烃 (PAHs) 限值，即 3.93 nM。该传感器用于测定油污染废水中的 PY 水平，结果表明，根据采集样品的位置离海远近，PY 含量在 4.93-23.49 nM 之间。油污染海水样品的高回收率表明，ACV 信号协议使 Au|G3PPT-co-P3HT 电极非常适合应用于具有复杂基质的样品。
