Nafady Ayman, Al-Enizi Abdullah M, Alothman Asma A, Shaikh Shoyebmohamad F
Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia.
Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia.
Talanta. 2021 Aug 1;230:122292. doi: 10.1016/j.talanta.2021.122292. Epub 2021 Mar 17.
Exposure to colorless ammonia gas may lead to damage in human organs or even death. Herein, we describe facile fabrication of an environmentally-friendly, portable, reversible, and sensitive solid-state colorimetric cellulose (Cell)/anthocyanin (Anth) vapochromic sensor that exhibits instant visual color change to both gaseous and aqueous phases of ammonia. The naturally occurring anthocyanin can be easily extracted from the red-cabbage plant and applied as a direct dyestuff onto viscose fibers in the presence of potassium aluminum sulfate as mordant to generate nanoparticles of mordant/anthocyanin coordinated complex. Thus, upon exposure to aqueous ammonia, an instant color change of the smart (Cell-Anth) diagnostic assays, from purple to colorless, was noted and quantitatively probed via both CIE Lab coordinates and UV-Vis spectral measurements. Importantly, the fabricated (Cell-Anth) viscose fabric showed rapid responses, fraction of second, with a good limit of detection (LOD) in the range of 200-1200 mg L. This receptor also demonstrated ratiometric changes in the UV-Vis absorbance spectra, giving a hypsochromic shift from 611 to 375 nm upon increasing the total content of ammonia in an aqueous media. The morphologies of Cell-Anth fabrics as well as particle size of the generated mordant/dye complex on the fabric surface have been characterized by transmission electron microscopic (TEM), scan electron microscopy (SEM), energy-dispersive X-ray patterns (EDX) and Fourier-transform infrared spectroscopic (FT-IR). The comfortability of the dyed cellulose fibers was also investigated in terms of their bend length, air-permeability and colorfastness properties. Significantly, the present study offers a promising onsite vapochromic device that enables detection of ammonia in either aqueous or gas phase in various environments and products.
接触无色氨气可能会导致人体器官损伤甚至死亡。在此，我们描述了一种简便的方法来制备一种环境友好、便携式、可逆且灵敏的固态比色纤维素（Cell）/花青素（Anth）气致变色传感器，该传感器对氨气的气相和水相均能呈现即时的视觉颜色变化。天然存在的花青素可以很容易地从红甘蓝植物中提取出来，并在硫酸铝钾作为媒染剂的情况下，作为直接染料应用于粘胶纤维上，以生成媒染剂/花青素配位络合物的纳米颗粒。因此，当暴露于氨水时，智能（Cell - Anth）诊断检测会立即发生颜色变化，从紫色变为无色，并通过CIE Lab坐标和紫外 - 可见光谱测量进行定量探测。重要的是，制备的（Cell - Anth）粘胶织物显示出快速响应，在秒级范围内，检测限（LOD）良好，范围为200 - 1200 mg/L。该受体在紫外 - 可见吸收光谱中也表现出比例变化，随着水介质中氨总含量的增加，发生从611 nm到375 nm的蓝移。通过透射电子显微镜（TEM）、扫描电子显微镜（SEM）、能量色散X射线图谱（EDX）和傅里叶变换红外光谱（FT - IR）对Cell - Anth织物的形态以及织物表面生成的媒染剂/染料络合物的粒径进行了表征。还从弯曲长度、透气性和色牢度等方面研究了染色纤维素纤维的舒适性。值得注意的是，本研究提供了一种有前景的现场气致变色装置，能够在各种环境和产品中检测水相或气相中的氨。
