Abstract
A new type of instrumentation for single-step bioaffinity assays and microvolume fluorometry is presented. The concept is based on the use of two-photon excitation by a low-cost near-infrared laser and individual observation of bioactive fluorescent microparticles. The applicability of the instrument is demonstrated by a microparticle based multiplexed bioaffinity assay where several fluorescent markers are simultaneously excited. This instrument can be applied in the growing fields of drug discovery, in life science research, and in routine laboratory diagnostics.
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