Patent ID: 7829327

Claim:
An optical waveguide type antibody chip, comprising: a transparent substrate; an incident-side optical element and an emitting-side optical element placed at a distance from each other on a primary face of the substrate; a water repellent resin film formed on the primary face of the substrate including an optical waveguide layer formed between the optical elements, the water repellent resin film comprising a reaction hole having exposed the optical waveguide layer on its bottom and a frame-shaped trench surrounding the reaction hole; a rectangular frame-shaped cell wall which is fixed in the trench of the water repellent resin film and which forms a cell capable of infusion and discharge of a specimen solution together with the reaction hole; and an antibody immobilization layer formed on the bottom of the reaction hole, the surface of the antibody immobilization layer being masked with a masking composition comprising at least a buffer agent and a salt.