Sekisui Medical Co., Ltd.

Japan-Lamb Inc.

Yasuyuki Hara

Michiko Kawamoto

Takayuki Akamine

Katsumi Yoshikawa

Shigeo Sudo

Tetsuya Ota

Shinya Sato

Shigehisa Iwamoto

Tatsuro Shimaoka

To provide a reagent for assaying anti-antibody which reagent contains a polypeptide antigen and which reagent provides high assay sensitivity and high specificity, and to provide an assay method employing the assay reagent. The reagent for assaying anti-antibody, for use in an assay of anti-antibody on the basis of antigen-antibody reaction is characterized in that the reagent contains, as an antigen, a recombinant polypeptide containing at least domain C and domain D of47 kDa antigen but containing no domain A1 of the 47 kDa antigen.

Reagent for assaying anti-treponema pallidum antibody

An object of the present invention is to provide: a purified serum albumin having less lot-to-lot variation; and an immunoassay method utilizing the purified serum albumin, in which high reactivity and less non-specific reactions are achieved. The present invention provides a purified serum albumin, which is a serum albumin used as a blocking agent and/or in a suspension containing an insoluble carrier in an immunoassay method, and is composed mostly of a fraction, the fraction having an absorbance of not exceeding 9.0 mAbs when measured in the form of 1% aqueous solution at a wavelength of 463 nm by using a quarts cell having an optical path length of 1.0 cm.

Purified serum albumin, and immunological measurement method

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Ryugasaki, Japan

Yasuyuki Hara