Highly selective nanozyme-based glucose sensing platform via construction of artificial recognition sites on gold nanospheres

Biosens Bioelectron. 2024 Feb 28;253:116169. doi: 10.1016/j.bios.2024.116169. Online ahead of print.ABSTRACTNanozymes have been regarded as the ideal alternatives to natural enzymes in bioassays due to their good stability and low cost. However, their applications in sensing usually suffer from poor selectivity. For example, Au-based nanozymes, as a kind of classical glucose oxidase mimic enzyme, could catalyze diverse monosaccharides. Therefore, it is of great necessity and urgency to endow the Au-based nanozymes with enhanced selectivity for the construction of specific glucose sensing platform. In our study, easily recyclable polydopamine (PDA)-supported Au-based nanozymes (PDA@Au NPs) were successfully prepared and could catalyze diverse monosaccharides including glucose, xylose, mannose, and sucrose. To enhance the selectivity of PDA@Au NPs, molecularly imprinted polymers (MIPs) were constructed on the surface of PDA@Au NPs using glucose and boronic acid derivatives as template and functional monomer. Impressively, the catalytic activity of the obtained molecularly imprinted nanozyme (PDA@Au NPs-MIPs) only shows a slight decrease (6.3%) while their selectivity is obviously enhanced (≥230%). Accordingly, the as-prepared sensor achieved the sensitive and selective detection of glucose in the concentration range of 10 μM-1 mM and a low detection limit (LOD) of 0.227 μM (S/N = 3), avoiding the influence of other monosaccharides exited in the sensing solutions to a great ...
Source: Biosensors and Bioelectronics - Category: Biotechnology Authors: Source Type: research