Kari Nuerguli, Koxmak Sayyara, Wumaier Kediliya, Nizamidin Patima, Abliz Shawket, Yimit Abliz
Institute of Applied Chemistry, College of Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, PR China.
Institute of Applied Chemistry, College of Chemistry, Xinjiang University, Urumqi, 830046, Xinjiang, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Jan 5;244:118863. doi: 10.1016/j.saa.2020.118863. Epub 2020 Aug 22.
Optical waveguide gas sensor with bromocresol purple (BCP) nano-film (70-80 nm) composited with silicone deposited on surface of K-ion exchanged glass slide was fabricated and applied to detect amine gases released during mutton spoilage to test mutton freshness with the help of laser light (632 m). Gas sensing measurements (output light intensity vs. time) proved its high selectivity and good sensitivity (0.01 ppm) toward amines among volatile organic compounds. The optimal fabricating condition (2600 rpm, 0.10% BCP, 5.17% silicone) was selected experimentally, displaying 1 s and 12 s response-recovery time toward gases released from mutton samples stored at 5 °C and 25 °C respectively. The sensing mechanism was explained by combination and competition of diffusion-reaction, considering deprotonating reaction of bromocresol purple molecules and molecular size of analyte gases in diffusion process. UV-vis spectroscopy was used to select the specific wavelength of laser light source in optical waveguide performance and to detect the total volatile basic nitrogen contents in mutton sample to confirm the practicability of as-prepared optical waveguide sensor in detecting mutton freshness. The fabricated sensor is able to detect 7.2 mg/100 g gases released from mutton decomposition, providing a simple, fast, and cheap method to detect meat freshness.
制备了一种光波导气体传感器，其表面沉积有与硅酮复合的溴甲酚紫（BCP）纳米薄膜（70 - 80纳米），该薄膜沉积在钾离子交换玻璃载玻片表面，并借助632纳米激光用于检测羊肉变质过程中释放的胺类气体，以测试羊肉的新鲜度。气体传感测量（输出光强度与时间的关系）证明了其对挥发性有机化合物中的胺类具有高选择性和良好的灵敏度（0.01 ppm）。通过实验选择了最佳制备条件（2600转/分钟，0.10% BCP，5.17%硅酮），该传感器对分别储存在5℃和25℃的羊肉样品释放的气体的响应 - 恢复时间分别为1秒和12秒。考虑到溴甲酚紫分子的去质子化反应以及扩散过程中分析物气体的分子大小，通过扩散 - 反应的结合和竞争来解释传感机制。紫外 - 可见光谱用于选择光波导性能中激光光源的特定波长，并检测羊肉样品中的总挥发性碱性氮含量，以确认所制备的光波导传感器在检测羊肉新鲜度方面的实用性。所制备的传感器能够检测羊肉分解产生的7.2毫克/100克气体，为检测肉类新鲜度提供了一种简单、快速且廉价的方法。
