Abstract
Recent advances in molecular analysis techniques have enabled scientists to assess the tiny amounts of biochemical substances secreted in our bodies. This has revealed that the levels of various secretory hormones and immune substances vary sensitively with the mental state of a person. Such hormones and immune substances exhibit transient increases with various psychological stressors. They thus have the potential to be used as a novel biometric for monitoring stress. Biomarkers that occur in saliva can be monitored non-invasively and are thus potentially useful as practical indicators of mental stress. Stress biomarkers are considered to be released into the blood stream or other secretory fluids by physiological stress reactions. Stress biomarkers are expected to be detectable in sweat and other humoral fluids that are exuded from the skin surface. Based on this, we have developed a bionanodevice for detecting stress by capturing stress biomarkers on the skin surface in a non-invasive manner. A prototype bionanodevice is described in which a motor protein is introduced for molecular handling.
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