DNAzyme-Functionalized R-Phycoerythrin as a Cost-Effective and Environment-Friendly Fluorescent Biosensor for Aqueous Pb2+ Detection

Sensors

Jikui Wu¹  Ningna Ren¹  Ruinan Wang¹  Junling Zhang²  Min Jia²  Yunfei Lu² 

[1] College of Food Science and Technology, Ministry of Agriculture, National R&D Branch Center for Freshwater Aquatic Products Processing Technology (Shanghai), Laboratory of Quality and Safety Risk Assessment for Aquatic Product on Storage and Preservation (Shanghai), Shanghai Ocean University, Shanghai 201306, China;

关键词: DNAzyme;    R-phycoerythrin;    sensors;    Pb²⁺;    fluorescence resonance energy transfer;   

DOI  :  10.3390/s19122732

来源: DOAJ

【 摘 要 】

The sensitive detection of Pb²⁺ is of significant importance for food safety, environmental monitoring, and human health care. To this end, a novel fluorescent biosensor, DNAzyme-functionalized R-phycoerythrin (DNAzyme-R-PE), was presented for Pb²⁺ analysis. The biosensor was prepared via the immobilization of Iowa Black^® FQ-modified DNAzyme−substrate complex onto the surface of SPDP-functionalized R-PE. The biosensor produced a minimal fluorescence signal in the absence of Pb²⁺. However, Pb²⁺ recognition can induce the cleavage of substrate, resulting in a fluorescence restoration of R-PE. The fluorescence changes were used to measure sensitively Pb²⁺ and the limit of detection was 0.16 nM with a linear range from 0.5−75 nM. Furthermore, the proposed biosensor showed excellent selectivity towards Pb²⁺ even in the presence of other metal ions interferences and was demonstrated to successfully determine Pb²⁺ in spiked lake water samples.

【 授权许可】

Unknown