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| home > ebr > winter 2002 > determination of absorptivity constants for biopharmaceutical protein products by amino acid analysis |
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European BioPharmaceutical Review
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Early in the development of any pharmaceutical product the absorptivity (as) or extinction coefficient (e) of the molecule is determined. Determination of an absorptivity constant for a small organic molecule is often a minor undertaking. The purified and dried molecule is quantitated by gravimetric means, followed by dissolution in an appropriate buffer or solvent and simple ultraviolet/visible light (UV/VIS) spectrophotometric analysis at its l maximum.
For protein-based biopharmaceuticals, however, this is not as easily accomplished. The limiting step is quantitation of the protein, which often contains contaminating proteins, bound salts, metals and excessive amounts of bound water. Quantitation of purified proteins for determination of absorptivity constants in a defined solution has been accomplished in the past by gravimetric, Kjeldahl and colorimetric techniques (1, 2) and by amino acid analysis. Statistically derived approaches for prediction of the absorptivity constants of proteins are also available.
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