Headspace Thin-Film Microextraction Coupled with Surface-Enhanced Raman Scattering as a Facile Method for Reproducible and Specific Detection of Sulfur Dioxide in Wine

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• 作者：Zhuo Deng ; Xuexu Chen ; Yiru Wang ; Enhua Fang ; Zhigang Zhang ; Xi Chen
• 刊名：Analytical Chemistry
• 出版年：2015
• 出版时间：January 6, 2015
• 年：2015
• 卷：87
• 期：1
• 页码：633-640
• 全文大小：447K
• ISSN：1520-6882

文摘

By coupling thin-film microextraction (TFME) with surface-enhanced Raman scattering (SERS), a facile method was developed for the determination of sulfur dioxide (SO₂), the most effective food additive in winemaking technology. The TFME substrate was made by free settling of sea urchin-like ZnO nanomaterials on a glass sheet. The headspace sampling (HS) procedure for SO₂ was performed in a simple homemade device, and then the SO₂ was determined using SERS after uniformly dropping or spraying a SERS-active substrate (gold nanoparticles, AuNPs) onto the surface of the TFME substrate. A reproducible and strong SERS response of the SO₂ absorbed onto the ZnO substrate was obtained. After condition optimization, the SERS signal intensity at a shift of 600 cm^鈥? and the SO₂ concentration showed a good linearity in the range of 1鈥?00 渭g/mL, and the linear correlation coefficient was 0.992. The detection limit for SO₂ was found to be 0.1 渭g/mL. The HS鈥揟FME鈥揝ERS method was applied for the determination of SO₂ in wine, and the results obtained agreed very well with those obtained using the traditional distillation and titration method. Analysis of variance and Student t test show that there is no significant difference between the two methods, indicating that the newly developed method is fast, convenient, sensitive and has selective characteristics in the determination of SO₂ in wine.