Fluorescence properties of albumin blue 633 and 670 in plasma and whole blood.
We have determined the fluorescence characteristics of two long wavelength dyes, albumin blue 633 (AB633) and 670 (AB670), in plasma and blood to evaluate the possibility of making direct fluorescence sensing measurements in blood. Using binding and lifetime measurements we were also able to show that these dyes bind selectively to human serum albumin (HSA) in plasma and blood. By measuring changes in the mean lifetime of AB670 with changes in the HSA concentration, we showed that lifetime-based sensing can be used to monitor HSA concentrations using these albumin blue dyes. Anisotropy measurements for AB633 and AB670 in plasma and blood revealed high anisotropy values for these dyes in these media. Exploiting these high anisotropies, we were also able to determine HSA concentrations in plasma and blood mimics using changes in AB670 anisotropy with HSA concentration. These results show that, apart from being able to make fluorescence measurements directly in plasma and blood, it is possible to sense directly for specific plasma/blood components using fluorescent probes that bind preferentially to them.
Abugo
O O
OO
University of Maryland at Baltimore,Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, Maryland 21201, USA.
Herman
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P
Lakowicz
J R
JR
D016880:Anisotropy; D001583:Benzoxazoles / Q000097:blood*; D001798:Blood Proteins / Q000378:metabolism; D003517:Cyclopentanes / Q000097:blood*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000378:metabolism*; D006801:Humans; D009570:Nitriles / Q000097:blood*; D010949:Plasma / Q000378:metabolism*; D013997:Time Factors
D001583:Benzoxazoles; D001798:Blood Proteins; D003517:Cyclopentanes; D005456:Fluorescent Dyes; D009570:Nitriles; C075643:albumin blue 633; C075644:albumin blue 670