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Buffering substances of human semen.

E Wolters-Everhardt, J M Dony, W H Peters

    Fertility and Sterility
    |July 1, 1987
    PubMed
    Summary

    Semen's buffering capacity (BC) is mainly from low molecular weight components, not sperm or proteins. The bicarbonate/carbon dioxide system contributes significantly, but other small molecules are key to semen's buffering.

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    Area of Science:

    • Biochemistry
    • Reproductive Biology
    • Semen Analysis

    Background:

    • Semen's buffering capacity (BC) is crucial for sperm viability.
    • Previous studies have not fully elucidated the quantitative contribution of various semen components to its BC.

    Purpose of the Study:

    • To determine the relative contributions of different semen components to the overall buffering capacity.
    • To identify the primary determinants of semen's buffering capacity.

    Main Methods:

    • Quantitative analysis of semen components.
    • Measurement of buffering capacity (BC) contributions from spermatozoa, high-molecular weight components (proteins), the bicarbonate/carbon dioxide (HCO3-/CO2) system, and other low molecular weight components.

    Main Results:

    • Spermatozoa contribute negligibly (less than 2%) to semen's BC.
    • High-molecular weight components (proteins) and the HCO3-/CO2 system each account for approximately 25% of the BC.
    • Low molecular weight components, excluding HCO3-/CO2, constitute about 50% of the BC.

    Conclusions:

    • The buffering capacity of human semen is primarily determined by low molecular weight components.
    • Proteins and the bicarbonate/carbon dioxide system play a significant, but secondary, role in semen's BC.
    • Further research should focus on identifying specific low molecular weight compounds responsible for the major buffering effect in semen.

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