Micro‐Scale Arrays Fabricated on Parafilm and Polymethyl Methacrylate Towards Differential Colorimetric Analysis of Amines via Shape Transformation of Ag Nanoprisms

A novel micro‐array was developed to a colorimetric detection of some amines, including histamine (HT), cadaverine (CAD), 1,4‐diaminobutane (putrescine), 2‐phenylethylamine (2‐PEA), spermidine (SD) and ethylenediamine (EA) using silver nanoparticle (silver nanoprisms [AgNPrs]) as optical nanoprobe. This method relies on the chemical interaction between the TA‐AgNPrs probe and candidate amines, resulting in observable colour changes. The interaction mechanisms were analysed using various techniques, including UV–visible spectrophotometry, naked‐eye colorimetry dynamic light scattering spectroscopy and zeta potential measurements. The efficient interactions between the analytes and the optical probe are particularly observed at absorption conditions of 220–800 nm by a UV–visible spectrophotometry method. The designed chemosensor accurately detects various amines in the linear concentrations ranging of 1 µM to 50 mM. This analytical system has been successfully applied to analyse candidate amines in meat samples.