Tang Jiayuan, Zhuo Dali, Dong Xiaoyu, Xiao Jing, Zhang Shu, Xiong Xiaoli, Tan Chao, Zou Zhirong
Key Laboratory of the Evaluation and Monitoring of Southwest Land Resources (Ministry of Education), College of Chemistry and Material Science, Sichuan Normal University, Chengdu, Sichuan, 610068, China.
Key Lab of Process Analysis and Control of Sichuan Universities, Yibin University, Yibin, Sichuan, 644000, China.
Food Chem X. 2024 Jul 11;23:101638. doi: 10.1016/j.fochx.2024.101638. eCollection 2024 Oct 30.
A gas pressure meter-based portable/miniaturized analytical kit was established for rapid and on-site detection of oxalate. Potassium permanganate (KMnO) and oxalate solution were mixed together in bottle-in-bottle reaction device, a simple oxidation reaction process occurred within 6 min and carbon dioxide (CO) was generated, inducing the pressure of the sealed bottle changed, which was measured by a portable gas pressure meter. A detectable range of 0.1-6 μmol mL and a detection limit of 0.064 μmol mL were achieved. The proposed analytical method was further used for the analysis of several real samples (spinach, beverages and water samples), with the recoveries of 89-111%. Considering the interferences from the complicated matrix, calcium chloride (CaCl) was served as a precipitant, oxalate (CO ) was precipitated with Ca to form precipitation (CaCO), CaCO was then separated from the matrix by centrifuge/filter, eliminating the interferences. It is a rapid, easy-used and interference-free analytical system/device for oxalate on-site and real time analysis.
建立了一种基于气体压力计的便携式/小型化分析试剂盒，用于草酸盐的快速现场检测。在瓶中瓶反应装置中将高锰酸钾（KMnO）和草酸盐溶液混合在一起，在6分钟内发生简单的氧化反应过程并产生二氧化碳（CO），导致密封瓶的压力发生变化，通过便携式气体压力计进行测量。实现了0.1 - 6 μmol/mL的可检测范围和0.064 μmol/mL的检测限。所提出的分析方法进一步用于分析几个实际样品（菠菜、饮料和水样），回收率为89 - 111%。考虑到复杂基质的干扰，使用氯化钙（CaCl）作为沉淀剂，草酸盐（CO）与Ca沉淀形成沉淀（CaCO），然后通过离心/过滤将CaCO与基质分离，消除干扰。这是一种用于草酸盐现场实时分析的快速、易用且无干扰的分析系统/装置。
