Abstract: The present invention provides an odorant composition having good palatability allowing peoples to feel comfortable using a small number of chemical compounds. An odorant composition according to an embodiment of the present invention consists of: when the total mass of ingredients contained in the odorant composition is 100.0% by mass, 40.0% by mass or more and 97.5% by mass or less of an ingredient (A) composed of aldehydes; 1.0% by mass or more and 20.0% by mass or less of an ingredient (B) composed of a ketone(s); and the balance being an ingredient (C) composed of a chemical compound(s) other than the ingredient (A) and the ingredient (B). The aldehydes of the ingredient (A) are: an essential ingredient (A1) composed of nonanal; and an optional ingredient (A2) selected from the group consisting of decanal, heptanal, octanal, benzaldehyde, undecanal, hexanal, and combinations thereof.

Abstract: The invention relates to the development of a method for assaying an antigen which is associated with disorders caused by mental stress in a human body fluid by way of an immunoassay technique which utilizes an antibody against a mental stress related protein having the following properties or a fragment thereof: (1) having a molecular weight of about 14 kDa (measured by SDS-PAGE); and (2) having the N-terminal partial sequence represented by SEQ ID NO: 1; and a kit for diagnosing disorders caused by mental stress which contains the above-mentioned antibody or a fragment thereof. Thus, the accumulation of mental stress can be easily estimated and judged and the results can be applied to the diagnosis of disorders caused by mental stress.