Bottle-in-bottle reaction device: Portable gas pressure meter for rapid and on-site analysis of oxalate in spinach and tea beverages.

ABSTRACT: A gas pressure meter-based portable/miniaturized analytical kit was established for rapid and on-site detection of oxalate. Potassium permanganate (KMnO₄) and oxalate solution were mixed together in bottle-in-bottle reaction device, a simple oxidation reaction process occurred within 6 min and carbon dioxide (CO₂) 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^-1 and a detection limit of 0.064 μmol mL^-1 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 (CaCl₂) was served as a precipitant, oxalate (C₂O₄ ^2-) was precipitated with Ca²⁺ to form precipitation (CaC₂O₄), CaC₂O₄ 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.

SUBMITTER: Tang J 

PROVIDER: S-EPMC11305198 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature