Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide With the increasing demand for food safety and quality monitoring, efficient freshness detection technologies are crucial. This study presents a flexible ammonia sensor based on polyaniline (PANI)-poly(vinylidene fluoride) (PVDF) composite membrane integrated with silver electrodes for rapid chilled meat freshness assessment. A uniform PANI-sensitive layer was synthesized on the PVDF membrane via chemical polymerization, followed by screen-printing of highly conductive silver interdigitated electrodes. Leveraging PANI’s high sensitivity to NH 3, the sensor enables real-time monitoring of ammonia released during meat storage, thus indirectly reflecting meat freshness. Experimental results demonstrate that the sensor exhibits excellent sensitivity (response >20% at 10 ppm of NH 3 ) and rapid response dynamics ( T 90 ≈ 240 s at 10 ppm of NH 3 ). By establishing correlations among sensor response, total volatile basic nitrogen (TVB-N) content, and storage time, an accurate freshness evaluation of chilled meat is achieved. Its simple fabrication, low cost, and easy integration provide an efficient and reliable technical solution for food freshness monitoring.
Source: ACS Omega
Authors: Yulong Sun, Weiguo Lin
Institution: Huazhong Agricultural University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,935
Award: G7105347491
OpenAlex ID: W4415599045