Journal
ANALYTICAL CHEMISTRY
Volume 76, Issue 22, Pages 6765-6770Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac048937w
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This study describes the development of a surface plasmon fluorescence spectroscopy (SPFS)-based sandwich immunoassay, for the detection of free prostate-specific antigen (f-PSA). The commercial CM5 chip (Biacore) was integrated into the SPFS-based assay making use of its three-dimensionally extended dextran architecture, which offers a large protein retention capacity and alleviates the metal-induced fluorescence quenching. The performance of the f-PSA assay was investigated in buffer and in human plasma, respectively. In the human plasma, the limit of detection of f-PSA was estimated to be similar to80 fM for 40 min of contact time, which adequately meets clinical requirements.
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