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In this study, we focused on the successful construction of [(4,4′-bipy/P 2 Mo 17 Co) 6 ] modified electrodes using the layer-by-layer assembly method for the sensitive detection of sulfathiazole (ST). The redox reaction between ST and the metal ions in the modified layer leads to the transfer of electrons, resulting in the generation of the electrical signal. The introduction of 4,4′-bipyridine (4,4′-bipy) enhanced the molecular recognition of ST by the modified electrode. Under the combined effect of P 2 Mo 17 Co and 4,4′-bipy, the sensor exhibited good performance for ST detection (LOD: 0.5616 μM, linear ST concentration range: 0–50 μM). The spiked recoveries of the two groups were 84.4%–103.2% and 90.9%–109.4% for the determination of ST residues in large yellow croaker and South American white shrimp, respectively. In addition, the electrode showed excellent performance in terms of stability, reproducibility, and anti-interference ability. [Display omitted] • Rapid detection and quantitative analysis of sulfathiazole residues in aquatic products. • A novel POMs electrochemical sensor for sulfonamide residue analysis was developed. • Preparation of [(4,4′-bipy/P 2 Mo 17 Co) 6 ] modified electrodes using the LBL method. • Modified electrodes based on P 2 Mo 17 Co and 4,4′-bipyridine improved detection sensitivity. [ABSTRACT FROM AUTHOR]

In recent years, bacteriocin, as a natural antimicrobial compound, provides enormous promise to be used in food safety preservation. In this work, the polyethylene(PE)-based biological preservative films incorporating plantaricin BM-1, a typical IIa bacteriocin produced by Lactobacillus plantarum BM-1, were developed and characterized. The results showed that PE, low-density PE (LDPE) and high-density PE (HDPE) films soaked in plantaricin BM-1 solution had obvious antimicrobial activities against Listeria monocytogenes. And the volume of plantaricin BM-1 solution absorbed by PE, LDPE and HDPE films continued to increase and reached the maximum during exposure for up to 10, 6 and 16 h, respectively. And the maximum absorption volumes of plantaricin BM-1 solution had no significant difference (P > 0.05) between the PE, LDPE and HDPE films. When soaking in water, the release amount of plantaricin BM-1 from active PE, LDPE and HDPE films reached the maximum potency at 16, 12 and 20 h, respectively. And the maximum release amount of plantaricin BM-1 from PE and LDPE active films was dramatically more than the HDPE active film (P < 0.05). Moreover, the inhibitory effect of active films incorporating plantaricin BM-1 maintained stability for at least 120 days against L. monocytogenes stored at 25°C, which suggest a potential application of the biological preservative films on the control of foodborne pathogen L. monocytogenes., (© FEMS 2016. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)