A1 Refereed original research article in a scientific journal
Ultra Sensitive Bioaffinity Assay for Micro Volumes
Authors: Soini J., Soukka J., Meltola N., Soini A., Soini E., Hänninen P.
Publication year: 2000
Journal: Single Molecules
Journal name in source: Single Molecules
Volume: 1
Issue: 3
First page : 203
Last page: 206
ISSN: 1438-5163
Web address : http://api.elsevier.com/content/abstract/scopus_id:0011263411
Abstract
An ultrasensitive separation free micro volume bioaffinity assay method is presented. The concept is based on the use of two-photon excited fluorescence and polystyrene microspheres as bioaffinity binding solid phase. Measurements are performed by observing individual microspheres in the diffraction limited focal volume of two-photon excitation. The method is suitable for measuring bioaffinity binding assays directly from the reaction volume without separation and washing steps. Depending on the sensitivity requirements the assay can be scaled. Scaling is achieved by adjusting the amount of solid phase microspheres for the assay. The scalability is demonstrated by measuring standard curves for an immunoassay. As a model assay we chose the human alpha-fetoprotein (AFP) immunometric assay. Operating ranges from 10 pg/ml up to 20 ng/ml and 100 pg/ml up to 400 ng/ml were achieved.
An ultrasensitive separation free micro volume bioaffinity assay method is presented. The concept is based on the use of two-photon excited fluorescence and polystyrene microspheres as bioaffinity binding solid phase. Measurements are performed by observing individual microspheres in the diffraction limited focal volume of two-photon excitation. The method is suitable for measuring bioaffinity binding assays directly from the reaction volume without separation and washing steps. Depending on the sensitivity requirements the assay can be scaled. Scaling is achieved by adjusting the amount of solid phase microspheres for the assay. The scalability is demonstrated by measuring standard curves for an immunoassay. As a model assay we chose the human alpha-fetoprotein (AFP) immunometric assay. Operating ranges from 10 pg/ml up to 20 ng/ml and 100 pg/ml up to 400 ng/ml were achieved.
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