| 摘要 |
<p>A method of marking a substrate to establish its identity and source involves addition of a minute concentration of an inert marker compound or of a mixture of such compounds to the substrate. The compound or compounds may be retrieved from the substrate by binding on an immunoaffinity column and subsequently quantified. Since the marker compound is in very low concentrations in the labelled chemical or composition its presence therein is not immediately apparent to someone who is unaware of the composition and the marker is virtually impossible to identify by routine analytical techniques.</p> |
