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Disclosed is a probe for detecting a substance in the body in gingival crevicular fluid. The probe includes a gingival sulcus insert section and a sensitive part. The gingival sulcus insert section can be inserted into a gingival sulcus. The sensitive part is arranged on the gingival sulcus insert s

Disclosed is a probe for detecting a substance in the body in gingival crevicular fluid. The probe includes a gingival sulcus insert section and a sensitive part. The gingival sulcus insert section can be inserted into a gingival sulcus. The sensitive part is arranged on the gingival sulcus insert section and contains a detection substance for permitting optical detection of the substance in the body. A system for detecting a substance in the body is also disclosed. The system for detecting a substance in the body includes the probe for detecting a substance in the body, a light irradiator for irradiating light onto the sensitive part in the probe, and a photodetector for detecting optical information from an inside of the sensitive part upon irradiation of light by the light irradiator.

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1. A probe for detecting a substance in the body in gingival crevicular fluid, comprising: a gingival sulcus insert section that can be inserted into a gingival sulcus; anda sensitive part arranged on the gingival sulcus insert section and containing a detection substance for permitting optical dete

1. A probe for detecting a substance in the body in gingival crevicular fluid, comprising: a gingival sulcus insert section that can be inserted into a gingival sulcus; anda sensitive part arranged on the gingival sulcus insert section and containing a detection substance for permitting optical detection of the substance in the body,wherein the gingival sulcus insert section is provided with a capillary portion through which the gingival crevicular fluid can be collected under capillary action, and the gingival crevicular fluid is introduced to the sensitive part via the capillary portion, andwherein the sensitive part is arranged on an inner wall of the capillary portion, and the detection substance is immobilized in the sensitive part. 2. The probe according to claim 1, further comprising an optical waveguide for performing at least one of irradiation of light onto the sensitive part and detection of light from the sensitive part. 3. The probe according to claim 2, wherein the optical waveguide is formed from an optical fiber. 4. The probe according to claim 2, wherein the optical waveguide is connected to a cylindrical side wall of the capillary portion. 5. The probe according to claim 1, wherein the gingival sulcus insert section has a short side or short axis of not greater than 0.2 mm. 6. The probe according to claim 1, wherein the immobilization has been achieved through a photoreaction. 7. The probe according to claim 1, wherein the detection substance causes a change in fluorescence intensity when the detection substance specifically binds to the substance in the body. 8. The probe according to claim 7, wherein the detection substance is a boronic acid compound. 9. The probe according to claim 1, wherein the detection substance comprises: (1) at least one enzyme; and(2) a substance that can become a target of optical measurement. 10. The probe according to claim 9, wherein the substance that can become the target of the optical measurement is a substance that is converted to a fluorescence source through a reaction with hydrogen peroxide as a product of an enzyme reaction. 11. The probe according to claim 10, wherein the fluorescence source is resorufin. 12. The probe according to claim 9, wherein the substance that is capable of becoming the target of the optical measurement is a substance whose absorbance changes through a reaction with hydrogen peroxide as a product of an enzyme reaction. 13. The probe according to claim 12, wherein the substance whose absorbance changes is o-dianisidine. 14. The probe according to claim 11, wherein the enzymes comprise: (1) a first enzyme for catalyzing a first reaction in which the substance in the body in the gingival crevicular fluid takes part, and a second enzyme for catalyzing a second reaction in which a product formed by the first reaction takes part; and(2) a substance that can become a target of optical measurement. 15. The probe according to claim 14, wherein the first enzyme is selected from the group including glucose oxidase, alcohol oxidase, uricase (urate oxidase), lactate oxidase, fructosyl-amino acid oxidase, sarcosine oxidase, and cholesterol oxidase. 16. The probe according to claim 14, wherein the second enzyme is peroxidase. 17. A system for detecting a substance in the body for detecting a substance in the body in gingival crevicular fluid, comprising: a probe for detecting a substance in the body provided witha gingival sulcus insert section that can be inserted into a gingival sulcus, anda sensitive part arranged on the gingival sulcus insert section and containing a detection substance for permitting optical detection of the substance in the body, wherein the gingival sulcus insert section is provided with a capillary portion through which the gingival crevicular fluid can be collected under capillary action, and the gingival crevicular fluid is introduced to the sensitive part via the capillary portion, and wherein the sensitive part is arranged on an inner wall of the capillary portion, and the detection substance is immobilized in the sensitive part;a light irradiator for irradiating light onto the sensitive part in the probe for detecting a substance in the body; anda photodetector for detecting optical information from an inside of the sensitive part upon irradiation of light by the light irradiator. 18. The system according to claim 17, further comprising a dichroic element for extracting optical information from the inside of the sensitive part upon irradiation of light by the light irradiator.