College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China; Jilin Province Research Center for Engineering and Technology of Spectral Analytical Instruments, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
Food Chem. 2024 Apr 16;438:137975. doi: 10.1016/j.foodchem.2023.137975. Epub 2023 Nov 11.
In this manuscript, we synthesized CDs@ZIF-8 through a one-step, in-situ method by integrating green-emitting carbon dots (CDs) with zeolitic imidazolate framework-8 (ZIF-8). The resulting CDs@ZIF-8 was utilized as an ultrasensitive probe for detection, leveraging the inner filter effect. The analysis demonstrated the capability to detect Sudan dyes. Sudan I, for example, could be detected within a concentration range spanning from 0.25 to 70 μM, achieving a remarkable detection limit of 76.56 nM. This established method was effectively employed for detecting Sudan I in paprika. Compared with CDs, CDs@ZIF-8 exhibited a 3.32-fold increase in sensitivity and a wider detection range. This enhanced performance was attributed to the porous ZIF-8, which allowed for the enrichment of targets around CDs and avoided the aggregation of CDs. Additionally, embedding the CDs in ZIF-8 improved their pH stability. Our study provides a new approach for using CDs under limited conditions by leveraging metal-organic frameworks.
在本文中，我们通过一步原位法将绿色发光碳点 (CDs) 与沸石咪唑酯骨架-8 (ZIF-8) 集成，合成了 CDs@ZIF-8。所得的 CDs@ZIF-8 被用作检测的超灵敏探针，利用内滤效应。分析表明，该探针可用于检测苏丹染料。例如，苏丹 I 的检测范围为 0.25 至 70 μM，检测限低至 76.56 nM。该方法可有效用于辣椒粉中苏丹 I 的检测。与 CDs 相比，CDs@ZIF-8 的灵敏度提高了 3.32 倍，检测范围也更宽。这种增强的性能归因于多孔的 ZIF-8，它允许在 CDs 周围富集目标，避免了 CDs 的聚集。此外，将 CDs 嵌入 ZIF-8 提高了它们的 pH 稳定性。我们的研究为在有限条件下利用金属有机框架来使用 CDs 提供了一种新方法。
