Liposome immunoblotting assay using a substrate-forming precipitate inside immunoliposomes |
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Authors: | Kumada Yoichi Maehara Masumi Tomioka Kanji Katoh Shigeo |
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Institution: | Graduate School of Science and Technology, Kobe University, Kobe 657-8501, Japan. |
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Abstract: | A new immunoblotting assay which uses antibody-coupled liposomes containing horseradish peroxidase is proposed. A substrate 4-chloro-1-naphthol permeated through the phospholipid membrane of the antibody-coupled liposomes and formed a colored product precipitating inside the liposomes. The precipitates accumulated in the liposomes and could be detected at the positions where the liposomes coupled with a target in blotted samples. Combination of liposomes with average diameter of 350 nm and a PVDF membrane with a pore size of 450 nm, 0.02 ng of IgM was detected, while the conventional immunoblotting using antibody-HRP conjugates detected 2 ng of IgM. The sensitivity increased about two orders of magnitude by the liposome immunoblotting assay. This liposome immunoblotting assay gives a simple detection method of proteins with a high sensitivity, as well as a high sensitivity Western blotting assay. |
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Keywords: | immunoliposome immunoblotting assay precipitate Western blotting |
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