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- W2002060311 abstract "Prostate-specific antigen (PSA) concentration in serum has been the biomarker employed for prostate cancer diagnosis in the last two decades. However, new more specific biomarkers allowing a better differentiation of cancer from non-malignant prostate diseases are necessary. Glycosylation of PSA gives rise to different forms of the protein which can be separated into several isoforms by analytical techniques, such as CE. Because PSA glycosylation is influenced by pathological conditions, the CE pattern of PSA isoforms could be different in prostate cancer than in non-malignant prostate diseases. To study this CE pattern of PSA, prior purification of the protein from the biological fluid is mandatory. In this study an immunoaffinity chromatography method which allows PSA purification without altering the CE pattern is developed. An in-house prepared column produced with commercial anti-PSA antibodies is employed. The use of 1 M propionic acid as elution agent provides higher than 40% recovery of high purity PSA. CE analysis of PSA immunopurified from seminal plasma of a healthy individual shows the same 8 peaks as the commercially available PSA standard. Sample preparation only requires dilution with phosphate buffered saline prior to immunoaffinity purification. High repeatability for the sample preparation step was achieved (RSD% for percentage of corrected peak area in the range 0.6–5.3 for CE analysis of three independently purified seminal plasma aliquots compared to range 0.8–4.9 for a given aliquot analyzed three times by CE). IAC of five microliters seminal plasma provided enough PSA to achieve signal/noise ratio larger than 5 for the smallest CE isoforms." @default.
- W2002060311 created "2016-06-24" @default.
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- W2002060311 date "2014-04-01" @default.
- W2002060311 modified "2023-09-25" @default.
- W2002060311 title "Immunoaffinity chromatographic isolation of prostate-specific antigen from seminal plasma for capillary electrophoresis analysis of its isoforms" @default.
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- W2002060311 doi "https://doi.org/10.1016/j.aca.2014.02.031" @default.
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