A Novel Gas Sensor for Detecting Pork Freshness Based on PANI/AgNWs/Silk

Abstract

A novel, operational, reliable, flexible gas sensor based on silk fibroin fibers (SFFs) as a substrate was proposed for detecting the freshness of pork. Silk is one of the earliest animal fibers utilized by humans, and SFFs exposed many biological micromolecules on the surface. Thus, the gas sensor was fabricated through polyaniline (PANI) and silver nanowires (AgNWs) and deposited on SFFs by in-suit polymerization. With trimethylamine (TMA) as a model gas, the sensing properties of the PANI/AgNWs/silk composites were examined at room temperature, and the linear correlativity was very prominent between these sensing measures and the TMA measures in the range of 3.33 μg/L–1200 μg/L. When the pork sample is detected by the sensor, it can be classified into fresh or stale pork with the total volatile basic nitrogen (TVB-N) as an index. The result indicated that the gas sensor was effective and showed great potential for applications to detect the freshness of pork.

Emerging Applications of Versatile Polyaniline-Based Polymers in the Food Industry

“…There was a more recent study in which a PANI/silver nanowire/silk composite was applied as a resistometric microsensor for the detection of TMA, and it was capable of indicating the freshness of pork. The high sensitivity (LOD: 3.3 µg/L), good stability, and repeatability (up to five cycles) made this composite a great potential freshness indicator for pork [ 132 ]. In addition, in a PLA/ZnO/CuO film, PANI played a significant role in the estimation of the shelf life and expiration date of orange juice, where it yielded an accuracy higher than 90%.…”

Recent progress in polyaniline-based chemiresistive flexible gas sensors: design, nanostructures, and composite materials

“…2 Trimethylamine is an indicator for evaluating the degree of meat spoilage. 3 Humidity detectors, when integrated into functional masks, offer significant potential for non-invasive disease diagnosis and wearable respiration monitoring. 4 However, harmful gases in low concentrations are often colorless and odorless and difficult to be felt by humans.…”