Fuente: PubMed "wine" Anal Chim Acta. 2026 Aug 15;1411:345645. doi: 10.1016/j.aca.2026.345645. Epub 2026 May 8.ABSTRACTBACKGROUND: Sulfur dioxide, the most commonly added preservative in wine, serves as antimicrobial and antioxidant functions, but excessive intake poses health risks. Due to the large production of wine, it is essential to develop rapid, sensitive and low-cost methods for detecting total SO2 in wine.RESULTS: A miniaturized optical emission spectrometer was developed by using a point discharge microplasma as an excitation source, in which characteristic optical emission of sulfur at 921.3 nm could be sensitively detected at low concentrations. Simultaneously, when high-concentration SO2 was introduced, the color of the microplasma would be obviously changed from purple to blue, thus the RGB values of the plasma color could be facilely used for quantification of total SO2 in its high concentration range. Therefore, a dual-mode detection strategy for total SO2 was achieved by combining the optical emission spectrometry and colorimetry, thus obtaining improved analytical performance, especially a wider linear dynamic range. Under the selected experimental conditions, a limit of detection (LOD) of 0.8 mg/L was achieved, with a relative standard deviation of 2.2% (10 mg/L, n = 9). The proposed method was successfully applied for determination of total SO2 in wine samples in its aeration process.SIGNIFICANCE: The proposed method and instrument feature rapid and sensitive detection of total SO2 in a wide dynamic linear range, with additional advantages of compactness, low power consumption and easy operation, showing promising potential for on-site analysis of total SO2 in wine and diverse food and environmental samples.PMID:42218006 | DOI:10.1016/j.aca.2026.345645