A Colorimetric Ag+ Probe for Food Real-Time Visual Monitoring

Abstract

Monitoring food quality throughout the food supply chain is critical to ensuring global food safety and minimizing food losses. Here we find that simply by mixing an aqueous solution of sugar-stabilized Ag+ and amines in an open vessel leads to the generation of Ag NPs and an intelligent evaluation system based on a colorimetric Ag+ probe is developed for real-time visual monitoring of food freshness. The self-assembly reaction between methylamine (MA) generated during meat storage and the colorimetric Ag+ probe produces different color changes that indicate changes in the quality of the meat. The colorimetric Ag+ probe was integrated into food packaging systems for real-time monitoring of chilled broiler meat freshness. The proposed evaluation system provides a versatile approach for detecting biogenic amines and monitoring chilled broiler meat freshness and it has the advantages of high selectivity, real-time and on-site measurements, sensitivity, economy, and safety and holds great public health significance.

Colorimetric Sensor Based on Ag-Fe NTs for H2S Sensing

“…Typical preparation of colorimetric gel tank was prepared by consulting our previously published papers with some modifications. 29 The colorimetric gel tank is made of ring-shaped foam tape with a 25 mm outer ring radius and a 15 mm inner ring radius. The bottom was sealed with Tyvek paper, which has excellent breathability and safety.…”

Recent Progress in Intelligent Packaging for Seafood and Meat Quality Monitoring

“…Figure a shows a colorimetric sugar‐stabilized silver cation (Ag + ) sensor for real‐time chicken quality monitoring using the RCS colorimetric method. [ 63 ] It can be seen in Figure 4b that R, G, and B chromaticity of the sensor change with time and temperature. Figure 4c shows the TEM images of nano‐structural changes and a particle size distribution histogram of silver nanoparticles (Ag NPs)at different reaction times.…”

“…Several smartphone apps provide intelligent packaging with scanning and analyzing Copyright 2022, the Authors, published by MDPI. [63] of their color photos. Therefore, a digital photo of colorimetric sensors/indicators can be taken to determine the quality of the food.…”

“…Figure 4. a) Colorimetric Ag + based sensor for chicken freshness real-time visual monitoring; b) Corresponding change in the colorimetric values of the sensor based on RCS method, and c) Nanostructural changes of Ag nanoparticles during the meat spoilage. Reproduced under the term of CC-BY license.Copyright 2022, the Authors, published by MDPI [63]. …”