4.7 Review

Quantitative analysis of therapeutic proteins in biological fluids: recent advancement in analytical techniques

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DRUG DELIVERY
卷 30, 期 1, 页码 -

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TAYLOR & FRANCIS LTD
DOI: 10.1080/10717544.2023.2183816

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Protein drugs; protein assays; LC-MS; MS; ELISA; chromatographic separation; quantitation

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The application of therapeutic proteins in pharmaceuticals is expanding, and efficient bioanalytical methods are crucial for their identification and clinical development. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) is often used for quantitative protein analysis in complex samples due to its sensitivity, specificity, and throughput. Proper sample preparation is important to minimize interference and enhance the accuracy of LC-MS/MS assays.
Pharmaceutical application of therapeutic proteins has been continuously expanded for the treatment of various diseases. Efficient and reliable bioanalytical methods are essential to expedite the identification and successful clinical development of therapeutic proteins. In particular, selective quantitative assays in a high-throughput format are critical for the pharmacokinetic and pharmacodynamic evaluation of protein drugs and to meet the regulatory requirements for new drug approval. However, the inherent complexity of proteins and many interfering substances presented in biological matrices have a great impact on the specificity, sensitivity, accuracy, and robustness of analytical assays, thereby hindering the quantification of proteins. To overcome these issues, various protein assays and sample preparation methods are currently available in a medium- or high-throughput format. While there is no standard or universal approach suitable for all circumstances, a liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay often becomes a method of choice for the identification and quantitative analysis of therapeutic proteins in complex biological samples, owing to its high sensitivity, specificity, and throughput. Accordingly, its application as an essential analytical tool is continuously expanded in pharmaceutical R&D processes. Proper sample preparation is also important since clean samples can minimize the interference from co-existing substances and improve the specificity and sensitivity of LC-MS/MS assays. A combination of different methods can be utilized to improve bioanalytical performance and ensure more accurate quantification. This review provides an overview of various protein assays and sample preparation methods, with particular emphasis on quantitative protein analysis by LC-MS/MS.

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