Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia.
Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia.
Int J Biol Macromol. 2024 May;267(Pt 2):131649. doi: 10.1016/j.ijbiomac.2024.131649. Epub 2024 Apr 16.
The colorless ammonia gas has been a significant intermediate in the industrial sector. However, prolonged exposure to ammonia causes harmful effects to organs or even death. Herein, an environmentally friendly solid-state ammonia sensor was developed utilizing colorimetric polycaprolactone-co-polylactic acid nanofibrous membrane. Pomegranate (Punica granatum L.) peel contains anthocyanin (ACN) as a naturally occurring spectroscopic probe. A mordant (potassium aluminum sulfate) is used to immobilize the anthocyanin direct dyestuff inside nanofibers, generating mordant/anthocyanin (M/ACN) coordinated complex nanoparticles. When exposed to ammonia, the color change of anthocyanin-encapsulated polycaprolactone-co-polylactic acid nanofibrous membrane from purple to transparent was examined by absorbance spectra and CIE Lab color parameters. With a quick colorimetric shift, the polycaprolactone-co-polylactic acid fabric exhibits a detection limit of 5-150 mg/L. The absorbance spectra showed a hypsochromic shift when exposed to ammonia, displaying an absorption shift from 559 nm to 391 nm with an isosbestic point of 448 nm. Scanning electron microscopy (SEM) images revealed that the polycaprolactone-co-polylactic acid nanofibers had a diameter of 75-125 nm, whereas transmission electron microscopy (TEM) images revealed that M/ACN nanoparticles exhibited diameters of 10-20 nm.
无色氨气一直是工业领域的重要中间体。然而，长时间暴露于氨气会对器官造成有害影响，甚至导致死亡。在此，我们利用比色聚己内酯-聚乳酸纳米纤维膜开发了一种环保型固态氨传感器。石榴（Punica granatum L.）皮中含有花色苷（ACN）作为天然光谱探针。使用媒染剂（硫酸铝钾）将花色苷直接染料固定在纳米纤维内，生成媒染剂/花色苷（M/ACN）配位复合纳米粒子。当暴露于氨气时，通过吸收光谱和 CIE Lab 颜色参数检查了包裹花色苷的聚己内酯-聚乳酸纳米纤维膜从紫色变为透明的颜色变化。聚己内酯-聚乳酸纤维具有快速比色变化，其检测限为 5-150 mg/L。吸收光谱显示出随氨暴露的红移，显示出从 559nm 到 391nm 的吸收位移，等色点为 448nm。扫描电子显微镜（SEM）图像显示，聚己内酯-聚乳酸纳米纤维的直径为 75-125nm，而透射电子显微镜（TEM）图像显示 M/ACN 纳米粒子的直径为 10-20nm。
