Halloysite nanotubes loaded with 4-aminothiophenol capped silver nanoparticles (mHNTs-AgNPs^4−ATP) composite was synthesized as a sensitive surface-enhanced Raman scattering (SERS) probe for the determination of nitrite ions in sausage and pork luncheon meat. The as-prepared composite was characterized by transmission electron microscope, X-ray diffraction spectroscopy and Fourier transform infrared spectroscopy. The as-synthesized mHNTs-AgNPs^4−ATP composite with evenly distribution of AgNPs can provide in-situ derivatization site for sensitive and selective SERS detection of nitrite ions. Under acid condition, the 4-ATP capped on the AgNPs can be transformed into p,p’-dimercaptoazobenzene (DMAB) through nitrite-triggered diazo reaction. This efficient nitrite-triggered reaction can be used to detect nitrite via the characteristic peaks of DMAB at 1143 cm⁻¹, 1392 cm⁻¹, and 1434 cm⁻¹. This SERS method has a wide logarithmic range of 0.0069–6.9 mg L⁻¹, with detection limit of 0.78, 3.4, 0.51 μg L⁻¹ at the peak of 1143 cm⁻¹, 1392 cm⁻¹, and 1434 cm⁻¹, respectively. Besides, this method can be applied to detect nitrite ions in sausage and pork luncheon meat with relative standard deviation less than 10.3%, and the results were consistent with that analyzed by UV–Vis method. This method has good potential in efficient detection of meat product in food safety.

合成了负载有4-氨基硫酚封端的银纳米颗粒（mHNTs-AgNPs ^4-ATP）复合材料的埃洛石纳米管，作为灵敏的表面增强拉曼散射（SERS）探针，用于测定香肠和猪肉午餐肉中的亚硝酸根离子。通过透射电子显微镜，X射线衍射光谱和傅里叶变换红外光谱对所制备的复合材料进行表征。合成后的mHNTs-AgNPs ^4-ATP复合物具有均匀的AgNPs分布，可为亚硝酸根离子的灵敏和选择性SERS检测提供原位衍生化位点。在酸性条件下，封固在AgNPs上的4-ATP可以转化为p，p'-二巯基偶氮苯（DMAB）通过亚硝酸盐引发的重氮反应。这种高效的亚硝酸盐触发反应可用于检测亚硝酸盐通过在1143厘米DMAB的特征峰^-1，1392厘米^-1，和1434厘米^-1。此SERS方法具有0.0069-6.9毫克的L宽对数范围^-1，具有0.78检出限，3.4，0.51微克大号^-1在1143 -1的峰^-1，1392厘米^-1，和1434厘米^-1， 分别。此外，该方法可用于相对标准偏差小于10.3％的香肠和猪肉午餐肉中亚硝酸根离子的检测，结果与UV-Vis分析方法相吻合。该方法具有在食品安全中有效检测肉制品的潜力。