Homogeneous immunoassay based on dihexadecyl-dimethylammonium bilayer membranes

Hirotaka Ihara, Takashi Imamura, Toyoki Kunitake, Chuichi Hirayama

研究成果: ジャーナルへの寄稿学術誌査読

2 被引用数 (Scopus)


We describe a rapid, highly sensitive, simple immunoassay based on cationic bilayer membranes prepared from dihexadecyl-dimethylammonium bromide. This detergent was dispersed in water to give a slightly turbid solution which contained lamellar (not vesicular) bilayer membranes with a gel to liquid crystal phase transition (Tc, 28°C). An anionic hapten (N,N′-bis(2,4-dinitrophenyl)-l-lysine) combined electrostatically with this cationic membrane to induce aggregation of membranes, making the solution turbid. This aggregation was suppressed by antibodies to the hapten. The aggregation rate was rapid at a temperature above Tc, and the amount of antibodies was quantified by measuring absorbance or light scattering of the aqueous solution with a detection limit of 0.1 ng/ml of the antibodies. Anionic and zwitterionic bilayer membranes from di(tetradecyl)phosphate and phosphocholine derivatives, respectively, were less sensitive as detectors of the hapten-antibody reaction. Ionic interactions between cationic bilayer membranes and anionic haptens are important for successful assay performance.

ジャーナルClinica Chimica Acta
出版ステータス出版済み - 6月 30 1988

All Science Journal Classification (ASJC) codes

  • 生化学
  • 臨床生化学
  • 生化学、医学


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