Abstract
Photo-thermal displacement measurement by laser interferometry involves the measurement of temperature change caused by illumination of the sample. To develop a system of detecting unlabeled homogeneous proteins based on laser interferometric measurement of photo-thermal displacement, we studied the interaction between aptamers and their target molecules by using thrombin and the thrombin aptamer as a model target and ligand, respectively. Because of the energy consumed by aptamer-thrombin interactions, the signals obtained from solutions containing aptamer-thrombin mixtures varied depending on the thrombin concentration. We propose that this method involving the use of aptamers and photo-thermal displacement measurement will provide a biomolecular detection system for rapid diagnosis.
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