Department of Chemistry, The Gandhigram Rural Institute-Deemed to Be University, Gandhigram, 624 302, Dindigul, Tamil Nadu, India.
Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 243303, Taiwan.
Mikrochim Acta. 2024 Sep 6;191(10):576. doi: 10.1007/s00604-024-06642-4.
Hydroquinone-based organic molecules are often used as unavoidable preservatives in the food industry. Among these additives, tertiary butylated hydroquinone (TBHQ) is widely employed as a preservative in various processed foods. However, the potential health risks associated with the excessive presence of TBHQ in food products have raised significant concerns. To address this pressing issuea novel binder-free composite composed of a manganese metal-organic framework and functionalized carbon nanofibers (Mn-MOF/f-CNF) has been developed as an electrode modifier for the ultrasensitive detection of TBHQ in food samples. The Mn-MOF/f-CNF composite was achieved using the ultrasonication method, revealing a lamellar sheet-like structure of the Mn-MOF and the curly thread-like fibrous structure of f-CNF. The developed Mn-MOF/f-CNF/SPE sensor system resulted in well-defined redox signals for TBHQ detection in a neutral pH solution. Compared to the unmodified SPE system, the modified system showed approximately a 300 mV reduction in overpotential and a twofold increase in peak current signal for TBHQ detection. The Mn-MOF/f-CNF/SPE sensor system showed a linear concentration window of 0.01 to 800 μM with a sensitivity of 6.28 µA µM cm and the obtained detection limit was 1.36 nM. Additionally, the proposed sensor displayed excellent reproducibility and repeatable results with an RSD of less than 5%. The real-time applicability of the Mn-MOF/f-CNF/SPE sensor system was demonstrated using real samples such as potato chips and instant noodles, showing excellent results with a recovery range of 95.1-98.5%.
基于氢醌的有机分子通常被用作食品工业中不可避免的防腐剂。在这些添加剂中，叔丁基对苯二酚 (TBHQ) 被广泛用作各种加工食品的防腐剂。然而，TBHQ 在食品中过量存在所带来的潜在健康风险引起了人们的极大关注。为了解决这一紧迫问题，开发了一种由锰金属有机骨架和功能化碳纳米纤维组成的新型无粘合剂复合电极修饰剂，用于食品样品中 TBHQ 的超灵敏检测。采用超声法制备了 Mn-MOF/f-CNF 复合材料，揭示了 Mn-MOF 的层状片状结构和 f-CNF 的卷曲线状纤维结构。所开发的 Mn-MOF/f-CNF/SPE 传感器系统在中性 pH 溶液中对 TBHQ 检测产生了定义明确的氧化还原信号。与未修饰的 SPE 系统相比，修饰后的系统对 TBHQ 检测的过电位降低了约 300 mV，峰电流信号增加了两倍。Mn-MOF/f-CNF/SPE 传感器系统的线性浓度范围为 0.01 至 800 μM，灵敏度为 6.28 µA µM cm，获得的检测限为 1.36 nM。此外，该传感器显示出出色的重现性和可重复性，RSD 小于 5%。使用薯片和方便面等实际样品证明了 Mn-MOF/f-CNF/SPE 传感器系统的实时适用性，回收率范围为 95.1-98.5%。
