| 摘要 |
Disclosed is a metal colloid that is suitable as a labeling agent or the like for tests such as immunoassays. Said metal colloid provides better visibility and higher sensitivity than gold colloids or gold-core platinum-shell composite colloids. The disclosed metal colloid is an alloyed gold/platinum composite colloid that is formed by: mixing a gold salt and a platinum salt, in the presence of an alkali, with at least one reducing agent selected from a group comprising amino acids, derivatives thereof, oligopeptides, derivatives thereof, and amino sugars; and reducing the gold salt and platinum salt.
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