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Abstract: Biorecognition is central to various biological processes and finds numerous applications in virtually all areas of chemistry, biology, and medicine. Artificial antibodies, produced by imprinting synthetic polymers, are designed to mimic the biological recognition capability of natural antibodies, while exhibiting superior thermal, chemical, and environmental stability compared to their natural counterparts. The binding affinity of the artificial antibodies to their antigens characterizes the biorecognition ability of these synthetic nanoconstructs and their ability to replace natural recognition elements. However, a quantitative study of the binding affinity of an artificial antibody to an antigen, especially at the molecular level, is still lacking. In this study, using atomic force microscopy-based force spectroscopy, the authors show that the binding affinity of an artificial antibody to an antigen (hemoglobin) is weaker than that of natural antibody. The fine difference in the molecular interactions manifests into a significant difference in the bioanalytical parameters of biosensors based on these recognition elements
Template and target information: protein, hemoglobin
Author keywords: artificial antibodies, gold nanorods, molecular imprinting, plasmonic biosensor, surface force spectroscopy