Hoefelschweiger, Bianca K. and Duerkop, Axel and Wolfbeis, Otto S. (2005) Novel type of general protein assay using a chromogenic and fluorogenic amine-reactive probe. ANALYTICAL BIOCHEMISTRY, 344 (1). pp. 122-129. ISSN 0003-2697, 1096-0309
Full text not available from this repository. (Request a copy)Abstract
We report on a new and simple one-reagent method for general protein assay. it makes use of one of two new reactive labeling reagents presented here (and referred to as pyrylium [Py] labels). These can be applied for both photometric and fluorometric protein assays at near neutral pHs at room temperature. The Py labels undergo a large spectral change on conjugation to the amino group of proteins and typically change their color from blue to red. Therefore, and unlike in other assays, there is no need to separate the unconjugated (blue) label from the red conjugate, which can be determined by direct photometry with a limit of detection of 1.2 l mu/ml for human serum albumin. The assay can be extended to fluorometry because the fluorescence of the free Py label is weak (with a quantum yield of < 1 %) but increases strongly (to > 40%) on conjugation. The strong fluorescence of the red conjugates can be determined directly and without interference by the blue (and weakly fluorescent) free label. The fluorometric assay resulted in a limit of detection of 60 ng/ml for bovine serum albumin (BSA). Validation of the fluorescence assay of blood plasma samples spiked with BSA gave recoveries in the range from 91 to 103%. (C) 2005 Published by Elsevier Inc.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PYRYLIUM CYANINE DYES; CHAMELEON LABELS; RANGE; REAGENT; ACIDS; photometric and fluorometric protein assay; pyrylium reactive fluorescent dyes |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Antje J. Bäumner, formerly Prof. Wolfbeis) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Apr 2021 04:29 |
| Last Modified: | 27 Apr 2021 04:29 |
| URI: | https://pred.uni-regensburg.de/id/eprint/35637 |
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