Retrieving "Detection Zone" from the archives

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1. Gold Sols

   Linked via "detection zone"

   Due to their strong optical properties and relatively facile functionalization with biological molecules (proteins, DNA), gold sols are central to many immunological assays. The most notable use is in the Lateral Flow Assay (LFA), the fundamental technology behind rapid point-of-care testing.
   In LFAs, functionalized gold particles act as visual reporters. When the [target analyte](/entries/target-an…