Serum Protein Electrophoresis (SPE) and Protein Charge
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Questions and Answers

What determines the migration speed of proteins in serum protein electrophoresis?

  • The size of the molecule and the medium's pH
  • The number of negative charges carried and the size of the molecule (correct)
  • The number of positive charges and the shape of the molecule
  • The charge of the electrode and the molecular weight
  • Which medium condition gives proteins a negative charge in serum protein electrophoresis?

  • Acidic media
  • Saline media
  • Neutral media
  • Alkaline media (correct)
  • Which buffer is used in serum protein electrophoresis to ensure proteins are negatively charged?

  • Barbital buffer pH=8.6 (correct)
  • Tris buffer
  • Acetate buffer
  • Phosphate buffer pH=7.4
  • After separation, which dyes are commonly used to stain the proteins on the cellulose acetate strip?

    <p>Ponceau S and amido black</p> Signup and view all the answers

    What is the purpose of using 5% acetic acid in serum protein electrophoresis?

    <p>To clear the background of the strip</p> Signup and view all the answers

    How many bands are typically observed on a cellulose acetate strip after serum protein electrophoresis?

    <p>Five</p> Signup and view all the answers

    Study Notes

    Serum Protein Electrophoresis (SPE)

    • Proteins are amphoteric molecules, meaning they can be uncharged, negatively charged, or positively charged depending on the pH of the surrounding media.

    Protein Charge and pH

    • In alkaline media (high pH), proteins are negatively charged (anions).
    • In acidic media (low pH), proteins are positively charged (cations).
    • In neutral media (pH 7), proteins are neutral.

    Principle of SPE

    • SPE separates and semi-quantifies serum proteins using an electrical field in alkaline media (Barbital buffer, pH 8.6).
    • Negatively charged protein molecules migrate towards the positive electrode (anode) at varying speeds based on:
      • Number of negative charges they carry (more negative charge, faster migration).
      • Size and shape of the molecule.

    SPE Process

    • Serum protein mixture is separated into distinct bands, typically 5 bands on a cellulose acetate strip.
    • The strip is then stained with dyes like Ponceau S or amido black.
    • The background is cleared with 5% acetic acid.
    • The strip is dried and interpreted by eye and densitometer.

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    Description

    Learn about the basics of Serum Protein Electrophoresis (SPE), including protein charge and its relation to pH levels. Understand how SPE separates and semi-quantifies serum proteins.

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