Titanium dioxide-polyaniline/silk fibroin microfiber sensor for pork freshness evaluation

• Published in: Sensors and actuators. B, Chemical Vol. 260; pp. 465 - 474
• Main Authors: Shi, Yongqiang, Li, Zhihua, Shi, Jiyong, Zhang, Fang, Zhou, Xucheng, Li, Yahui, Holmes, Mel, Zhang, Wen, Zou, Xiaobo
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.05.2018; Elsevier Science Ltd
• Subjects: Ammonia; Discriminant analysis; Fourier transforms; Freshness; Infrared spectrometers; Meat quality; Microfiber sensor; Microfibers; Nitrogen; Polyaniline; Polyanilines; Pork; Pork freshness; Response time; Scanning electron microscopy; Sensors; Silk fibroin; Titanium; Titanium dioxide; X-ray diffraction; Silk fibroin; Microfiber sensor; Pork freshness; Polyaniline; Titanium dioxide
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2018.01.078

[Display omitted] •A novel and low-cost micro-sensor was proposed based on TiO2-PANI/SFF microfiber with a diameter of 12 μm.•The response value of the micro-sensor to NH3 of 100 μg/L was 0.82 with a response time of 10 s.•Response values of the micro-sensor showed good correlation with TVB-N levels in pork (R2 = 0.990).•Discriminating accuracy of the micro-sensor for pork freshness was 86.38%. A novel and low-cost micro-sensor with a diameter of 12 μm was developed based on Titanium dioxide-Polyaniline/Silk fibroin fiber (TiO2-PANI/SFF). TiO2-PANI composites were deposited on surfaces of SFFs by in-situ polymerization. The microfibers were characterized by Scanning electron microscopy (SEM), Energy dispersive spectrometer (EDS), Raman spectrometer, Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD), and the formation mechanism of them was illustrated in detail. With ammonia (NH3) as model gas, the TiO2-PANI/SFF micro-sensor showed good sensing performance with response value of 0.82 and response time of 10 s to NH3 of 100 μg/L. When the micro-sensors were applied for pork freshness evaluation, the output response values showed good correlation with the total volatile basic nitrogen (TVB-N) levels in pork (R2 = 0.990), and the discriminant results of the micro-sensors for pork freshness based on linear discriminant analysis (LDA) showed the prediction accuracy of calibration and prediction set was 90.73% and 86.38%, respectively, which indicated the great potential of TiO2-PANI/SFF micro-sensor for pork freshness evaluation.