Alkaline phosphatase assay using a near-infrared fluorescent substrate merocyanine 700 phosphate
| Autor: | Nisha Padhye, Daniel R. Draney, Mark Cradduck, Garrick Little, Haibiao Gong, D. Michael Olive |
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| Rok vydání: | 2011 |
| Předmět: |
musculoskeletal diseases
Indoles Spectroscopy Near-Infrared musculoskeletal neural and ocular physiology Fluorescence spectrometry Substrate (chemistry) Hydrogen-Ion Concentration musculoskeletal system Phosphate Alkaline Phosphatase Fluorescence Analytical Chemistry chemistry.chemical_compound Hydrolysis stomatognathic system Biochemistry chemistry Hydrolase Alkaline phosphatase Merocyanine Benzopyrans Nuclear chemistry |
| Zdroj: | Talanta. 84(3) |
| ISSN: | 1873-3573 |
| Popis: | Alkaline phosphatase (ALP) is a phosphomonoester hydrolase that is commonly used as a conjugating enzyme in biological research. A wide variety of substrates have been developed to assay its activity. In this study, we developed an ALP assay method utilizing merocyanine 700 (MC700) based substrate MC700 phosphate (MC700p). MC700 is a near-infrared fluorescent merocyanine dye, and has excitation/emission maxima at 686 nm/722 nm in ALP assay buffer. Upon hydrolysis by ALP, MC700p is converted to MC700. The fluorescence of MC700 is dependent on the pH and detergent concentration in the buffer. The fluorescence signal produced by MC700p hydrolysis is linearly related to the ALP amount and substrate concentration. A stop solution containing EDTA could be used to stop the ALP/MC700p reaction. It was also demonstrated that MC700p could substitute pNpp as the ALP substrate in a commercial 17β-Estradiol enzyme immunoassay kit. |
| Databáze: | OpenAIRE |
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