Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Talanta. 2019 May 15;197:578-583. doi: 10.1016/j.talanta.2019.01.071. Epub 2019 Jan 24.
Herein, a simple, green, and novel paper-based headspace-thin film microextraction in combination with smartphone-based on-cell detection was introduced. Sulfite was selected as a model compound to study the performance of the method. The method was based on converting sulfite to SO by acidification of the sample solution. A piece of cellulose paper impregnated with Fe(III), 1,10-phenanthroline, and acetate buffer (pH = 5.5) was used for headspace-thin film microextraction. The sulfur dioxide adsorbed on the thin film reduced Fe(III) to Fe(II). The red color complex formed between Fe(II) and 1,10-phenanthroline was on-cell detected by a smartphone. The effect of various parameters on the method sensitivity was investigated. The method had three individual linear ranges (0.1-1.0, 1-50, and 50-700 µg L) with a detection limit of 0.04 µg L. The method provided a simple and green assay for the determination of sulfite in food samples. Recoveries were higher than 94% with the relative standard deviations lower than 4.8%. Expensive and complicated facilities were not required in the method.
本文介绍了一种简单、绿色、新颖的基于纸质顶空-薄膜微萃取与智能手机上的片上检测相结合的方法。选择亚硫酸盐作为模型化合物来研究该方法的性能。该方法基于酸化样品溶液将亚硫酸盐转化为 SO。使用一片浸渍有 Fe(III)、1,10-菲啰啉和醋酸盐缓冲液（pH = 5.5）的纤维素纸进行顶空-薄膜微萃取。吸附在薄膜上的二氧化硫将 Fe(III)还原为 Fe(II)。智能手机通过片上检测来检测 Fe(II)和 1,10-菲啰啉之间形成的红色络合物。考察了各种参数对方法灵敏度的影响。该方法具有三个独立的线性范围（0.1-1.0、1-50 和 50-700 µg L），检测限为 0.04 µg L。该方法为食品中亚硫酸盐的测定提供了一种简单、绿色的测定方法。回收率高于 94%，相对标准偏差低于 4.8%。该方法不需要昂贵且复杂的设备。
