Journal
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
Volume 150, Issue -, Pages 67-71Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpba.2017.11.076
Keywords
Multisensor system; Potentiometric sensor; Proteinase K; Protein A; Sorbent
Categories
Funding
- St. Petersburg State University [12.50.1191.2014]
- research resource center Molecular and cell technologies of St. Petersburg State University
- Government of Russian Federation [074-U01]
- Protein Contour LLC (Saint-Petersburg, Russian Federation)
- Spanish Ministry of Economy and Competitiveness - European Regional Development Fund [CTQ2014-54553-C3-1-R]
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Quantification of proteins is a key biochemical assay in molecular biology, biotechnology, medicine and pharmacology. Protein quantification protocols can be based on spectrophotometry, enzyme-linked immunosorbent assay, mass spectrometry or quantitative immunoblotting depending on analyte. In case of immobilized protein these methods require suitable sample preparation. Thus, sophisticated analysis becomes even more complex, expensive and time-consuming. Such drawbacks are highly undesirable in industry. In this study we propose a new approach for evaluation of immobilized protein concentration based on application of bio-assisted potentiometric multisensor system. Surface-immobilized recombinant protein A from Staphylococcus aureus (SpA, expressed in Escherichia coli), which is commonly used as affinity ligand immobilized to stationary phase (chromatography media) for monoclonal antibody purification was employed as the model object. Chromatography media samples containing different amounts of immobilized SpA were analyzed. Proteinase K from Tritirachium album was employed as a bio-transducer. We demonstrated that the suggested approach provides information about immobilized SpA concentration with 0.8 mg/ml accuracy in the range 1-6.7 mg/ml and within just 16 min. Moreover, the proposed procedure requires no expensive materials and equipment and no bio-transducer immobilization. This method has potential of application for fast monitoring of other immobilized proteins in different tasks. (C) 2017 Elsevier B.V. All rights reserved.
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