Xiuying Liu,Yu Wang,Zexin Zhang,Lijie Zhu,Xue Gao,Keli Zhong,Xiaofei Sun,Xuepeng Li,Jianrong Li
Freshness is an important parameter of fish quality. This study aims to develop a ratiometric fluorescent sensing label that is responsive to volatile amines, affording real-time and visual detection of fish freshness. For developing of the sensing label, an aggregation-induced emissive (AIE) polymer was prepared from the stimuli-responsive polymer polymethacrylic acid and the AIE molecule tetraphenylethylene and coated on to filter paper with rhodamine B as an internal reference. By exploiting the ratiometric response, the freshness of fish could be identified clearly and easily according to the color of on-package label, which changes from pink (fresh) to dark blue. The difference was linearly correlated with the total volatile basic nitrogen (TVB-N, R 2 = 0.995 and 0.994 at 25 °C and 4 °C, respectively) in the range of 15–25 mg/100 g for the salmon samples, which indicated that the sensing label feasibly and non-destructively quantified TVB-N.
Aggregation-induced emission (AIE) polymeric nanoparticles (NPs) with a size of several tens of nanometers were successfully prepared by miniemulsion copolymerization of methyl methacrylate (MMA) with an AIE monomer, 1-allyl-1-methyl-2,3,4,5-tetraphenylsilole (AMTPS). The prepared AIE poly(MMA-co-AMTPS) NPs exhibited strong photoluminescence with high quantum yields. Promisingly, the brightness of AIE poly(MMA-co-AMTPS) NPs, which increased linearly with an increase in AMTPS content, could be accurately modulated via the AMTPS content in the range of 0–20 wt%. In vitro cell experiments indicated that the AIE poly(MMA-co-AMTPS) NPs were promising cell staining reagents with good biocompatibility and high photostability.
危险品化学品经营许可证（带存储）