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Inter-batch quality differences in purified human prolactin.

V S Fang, J Armstrong, I G Worsley

    Clinical Chemistry
    |June 1, 1978
    PubMed
    Summary
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    Two batches of purified human prolactin yielded better assay results due to higher levels of "small" prolactin. This molecular form, identified via gel filtration, significantly improved assay sensitivity and consistency.

    Area of Science:

    • Endocrinology
    • Biochemistry
    • Assay Development

    Background:

    • Purified human prolactin is essential for developing reliable immunoassays.
    • Assay sensitivity and consistency are critical for accurate hormone quantification.
    • Variations in prolactin preparations can lead to discrepancies in assay performance.

    Purpose of the Study:

    • To investigate the impact of different purified human prolactin batches on immunoassay performance.
    • To identify molecular characteristics of prolactin that correlate with assay sensitivity and consistency.

    Main Methods:

    • Purification of human prolactin using lactoperoxidase technique.
    • Iodination of prolactin for radioimmunoassay development.
    • Gel filtration chromatography to analyze the molecular size distribution of labeled prolactin.

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    Main Results:

    • Two of six purified prolactin batches demonstrated superior assay sensitivity and consistency.
    • These superior batches contained at least 55% "small" prolactin.
    • The other four batches contained a higher proportion of "big" prolactin (20-68%), correlating with assay discrepancies.

    Conclusions:

    • The molecular size heterogeneity of purified human prolactin significantly impacts immunoassay performance.
    • "Small" prolactin is the preferred form for achieving sensitive and consistent prolactin assays.
    • Characterization of prolactin preparations is crucial for reliable diagnostic and research applications.