Ariel University, Israel.
Ariel University, Israel.
Anal Chim Acta. 2022 Apr 1;1200:339629. doi: 10.1016/j.aca.2022.339629. Epub 2022 Feb 17.
Reported herein is a novel detection method for sulfur dioxide in aqueous solutions, in which the presence of sulfur dioxide leads to color changes of filter paper modified with both β-cyclodextrin and manganese. This detection method is rapid (less than 5 min required for complete color change), sensitive (limits of detection as low as 33 ppm), broadly applicable (tolerant of a range of pH values), and practical (color changes can be observed via naked eye detection and quantified via straightforward color analysis). Extensive optimization of each component provides insight into the unique stabilizing effect of cyclodextrin in preventing the filter paper from permanganate-induced degradation, and mechanistic analysis points to an oxidation-reduction reaction as responsible for the observed color changes. Overall, these results lay the groundwork for the development of practical sulfur dioxide sensors for use in the food and beverage industry, and provide precedent for the use of cyclodextrin as a stabilizing force in paper-based chemical sensors.
本文报道了一种检测水溶液中二氧化硫的新方法，该方法基于β-环糊精和锰修饰滤纸，二氧化硫的存在会导致滤纸颜色发生变化。该检测方法快速（完全变色所需时间不到 5 分钟）、灵敏（检测限低至 33ppm）、适用范围广（耐受多种 pH 值）、实用性强（可通过肉眼观察颜色变化并用简单的比色分析进行定量）。对每个组件的广泛优化深入了解了环糊精在防止滤纸被高锰酸盐诱导降解方面的独特稳定作用，并且机理分析表明，观察到的颜色变化是由氧化还原反应引起的。总的来说，这些结果为开发用于食品和饮料行业的实用二氧化硫传感器奠定了基础，并为将环糊精用作基于纸张的化学传感器的稳定剂提供了先例。
