Department of Chemistry, College of Chemistry and Chemical Engineering, and the Key Laboratory of Analytical Sciences of Xiamen & State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China.
J Chromatogr A. 2012 Jul 13;1246:22-7. doi: 10.1016/j.chroma.2012.01.080. Epub 2012 Feb 3.
Zinc oxide (ZnO) nanorods based solid-phase microextraction (SPME) coating was directly prepared on stainless steel wires using in situ hydrothermal growth method. This coating has high surface-to-volume ratio with a diameter in the range of 300-500 nm and a thickness of about 3-5 μm. A guiding tube was introduced into the laboratory-made SPME fiber to protect the ZnO nanorods coating from shaving, which significantly improved the method repeatability and prolonged the service life of the coating. The extraction properties of the prepared fiber were investigated using headspace SPME (HS-SPME) coupled to gas chromatography (GC) for the determination of aldehydes in instant noodle samples. The extraction efficiency of the coating for the five aldehydes was comparable to that of a commercial 85 μm Carboxen/Polydimethylsiloxane fiber, which has been reported to have best affinity towards aldehydes among all commercial fibers. The linear ranges of the proposed HS-SPME-GC method were from 0.05 to 5 μg g⁻¹ (hexanal, nonanal and decanal) and 0.1-5 μg g⁻¹ (heptanal and octanal), with the correlation coefficients from 0.990 to 0.999. The method developed was successfully applied to the determination of five aldehydes in instant noodle samples, and the recoveries were found to be 70.5-129% at the spiking level of 2 μg g⁻¹.
氧化锌 (ZnO) 纳米棒固相微萃取 (SPME) 涂层是通过原位水热生长法直接在不锈钢丝上制备的。该涂层具有高的比表面积，直径在 300-500nm 范围内，厚度约为 3-5μm。为了保护 ZnO 纳米棒涂层免受刮削，引入了导向管到自制的 SPME 纤维中，这显著提高了方法的可重复性并延长了涂层的使用寿命。通过顶空固相微萃取（HS-SPME）与气相色谱（GC）联用，研究了制备纤维的萃取性能，用于测定方便面样品中的醛类。该涂层对五种醛类的萃取效率与商业 85μm Carboxen/Polydimethylsiloxane 纤维相当，该纤维被报道在所有商业纤维中对醛类具有最佳亲和力。所提出的 HS-SPME-GC 方法的线性范围为 0.05-5μg g⁻¹（己醛、壬醛和癸醛）和 0.1-5μg g⁻¹（庚醛和辛醛），相关系数从 0.990 到 0.999。该方法成功应用于方便面样品中五种醛类的测定，在 2μg g⁻¹ 的加标水平下，回收率为 70.5-129%。
