· 논문명 : Au-decorated α-Fe2O3-based electrochemical sensor for the detection of propyl gallate for monitoring

               preservative levels in packaged foods

· 저   자 : Jayasmita Jana, Tata Sanjay Kanna Sharma, Somnath Chowdhury, Mohamed A. Ghanem, Beena Mol Babu, 

               Sung Gu Kang, Jin Suk Chung, Won Mook Choi*, Seung Hyun Hur*

· 게재지 : Food Chemistry (2025, 486, 144597)

· 초록

In this study, we developed an electrochemical sensor based on Au-decorated iron oxide (Au@Fe2O3) for the sensitive and selective detection of propyl gallate (PG). Iron oxide is an affordable and biocompatible material exhibiting considerable electrochemical activity.

Herein, Au nanoparticles were added at a minimum concentration to the iron oxide matrix to enhance the conductivity and catalytic

properties. Electrochemical studies demonstrated that the Au@Fe2O3-modified SPE sensor exhibited excellent sensitivity, a low limit 

of detection(10.3 nM), and a wide linear detection range (0.16–500 μM), enabling effective PG detection even in the presence of

interfering compounds. It performed well in real sample tests conducted using different commercial food samples, demonstrating

high recovery rates and low relative standard deviations. Through density functional theory studies, the highest occupied molecular

orbital and lowest unoccupied molecular orbital of PG were analyzed, and electron affinity was determined as 1.89 eV to understand

the redox-active site.