| 摘要 |
<p>The present invention provides a method and device for determining the presence of or detecting endogenous and exogenous chemical substances in fluids, especially in body fluids. At least one of the analytes is encapsulated to provide greater stability, and allow for delayed release of one or more of the reactants. Among the types of exogenous substances which can be assayed are central nervous system stimulants (e.g., cocaine and amphetamine) and narcotics (e.g., opiate alkaloids) in urine.</p> |
