Single molecule tracking

Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation

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2504581, 2504591, 356417, G01N 2164

Patent

active

047937050

ABSTRACT:
A detection system is provided for identifying individual particles or molecules having characteristic emission in a flow train of the particles in a flow cell. A position sensitive sensor is located adjacent the flow cell in a position effective to detect the emissions from the particles within the flow cell and to assign spatial and temporal coordinates for the detected emissions. A computer is then enabled to predict spatial and temporal coordinates for the particle in the flow train as a function of a first detected emission. Comparison hardware or software then compares subsequent detected spatial and temporal coordinates with the predicted spatial and temporal coordinates to determine whether subsequently detected emissions originate from a particle in the train of particles. In one embodiment, the particles include fluorescent dyes which are excited to fluoresce a spectrum characteristic of the particular particle. Photones are emitted adjacent at least one microchannel plate sensor to enable spatial and temporal coordinates to be assigned. The effect of comparing detected coordinates with predicted coordinates is to define a moving sample volume which effectively precludes the effects of background emissions.

REFERENCES:
patent: 4698308 (1987-10-01), Ikeda
A. Ashkin et al., "Optical Trapping and Manipulation of Viruses and Bacteria," Science, 235, 1517-1520 (Mar. 1987).
Dinh C. Nguyen et al., "Ultrasensitive Laser-Induced Fluorescence Detection in Hydrodynamically Focused Flows," J. Opt. Soc. Am. B, 4, No. 2, 138-143 (Feb. 1987).
Dinh C. Nguyen et al., "Detection of Single Molecules of Phycoerythrin in Hydrodynamically Focused Flows by Laser-Induced Fluorescence," Anal. Chem., 59, 2158 (1987).

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