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Related Experiment Videos

Direct dye binding--a quantitative assay for solid-phase immobilized protein.

M Bonde1, H Pontoppidan, D S Pepper

  • 1Department of Biochemistry and Nutrition, Technical University of Denmark, Lyngby.

Analytical Biochemistry
|January 1, 1992
PubMed
Summary
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A new direct dye-binding assay quantifies immobilized protein on solid supports. This method, based on the Bradford assay, accurately measures protein levels for optimizing immobilization procedures.

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Quantifying immobilized proteins is crucial for various applications, including biosensors and chromatography.
  • Existing methods for protein quantification can be indirect or require protein elution, potentially altering the immobilized protein's state.
  • Developing a direct, simple assay for immobilized protein measurement is highly desirable.

Purpose of the Study:

  • To establish a direct dye-binding assay for quantifying proteins immobilized on solid phases.
  • To evaluate the assay's compatibility with common immobilization supports and activation methods.
  • To provide a reliable tool for optimizing protein immobilization procedures.

Main Methods:

  • A modified Bradford dye-binding assay was adapted for immobilized proteins (IgG, BSA) on solid supports.

Related Experiment Videos

  • Protein quantification was performed by measuring the decrease in absorbance at 465 nm (A465) in the supernatant.
  • Assay compatibility was tested with Sepharose, Sephadex, Sephacryl, and HEMA gels, and different activation methods (aldehyde, hydrazine, adipic acid dihydrazide).

    • Main Results:

    • The assay showed good correlation with indirect protein determination (A280) and hydrolyzed protein quantification in the range of 0-5 mg protein/ml gel.
    • Sepharose, Sephadex, and Sephacryl were compatible supports, while HEMA gels exhibited nonspecific dye binding.
    • No artifactual dye binding was observed with the tested activation methods on Sephacryl S-1000.

    Conclusions:

    • A direct, modified Bradford dye-binding assay was successfully developed for quantifying immobilized proteins.
    • The assay is compatible with commonly used protein immobilization matrices and activation chemistries.
    • This method offers a simple and useful tool for optimizing protein immobilization processes.