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为检测食品变质过程中产生的乙二胺气体,采用Alder法合成了四苯基卟啉和四苯基卟啉铁化合物,通过核磁(~1H NMR)、场发射扫描电子显微镜(FE-SEM)、红外光谱(IR)、紫外可见光谱(UV-Vis)等手段对其进行表征,并以四苯基卟啉铁作为敏感试剂,利用旋涂法制备了四苯基卟啉铁薄膜/K+交换玻璃光波导传感元件,对多种气体进行检测。结果表明:该传感元件对乙二胺气体具有较好的选择性响应,较高的灵敏度,在1×10~(-10)~1×10~(-4)(V/V_0;V:被检测气体体积,V0:空气体积)体积比范围内,体积比与输出光强度间线性关系良好(R=0.9940),响应时间和恢复时间分别为3 s和11 s,信噪比S/N=4.8,RSD=0.5%(V/V_0=1×10~(-7))。平行试验中,其结果也具有良好的线性关系(R=0.9985),证明该传感元件对乙二胺气体检测的准确性。该类传感元件在食品品质检测方面有很好的应用与发展。
In order to detect the ethylenediamine gas generated during the metamorphosis of food, tetraphenylporphyrin and tetraphenylporphyrin iron compounds were synthesized by Alder method and characterized by 1H-NMR, FE-SEM, , Infrared spectroscopy (IR) and UV-Vis spectroscopy. The tetraphenylporphyrin iron film / K + exchange was prepared by spin coating with tetraphenylporphyrin iron as the sensitive reagent Glass optical waveguide sensor, a variety of gases for testing. The results show that the sensing element has a good selective response to ethylenediamine gas and a high sensitivity of 1 × 10 ~ (-10) ~ 1 × 10 ~ (-4) (V / V_0; V: (R = 0.9940), the response time and recovery time were 3 s and 11 s respectively, and the signal-to-noise ratio S / N = 4.8, RSD = 0.5% (V / V_0 = 1 × 10 -7). In parallel experiments, the results also have a good linear relationship (R = 0.9985), which demonstrates the accuracy of the sensing element for ethylenediamine gas detection. This kind of sensor has good application and development in food quality testing.