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A nanogram-level colloidal gold single reagent quantitative protein assay
Gerald Harrison1, Patrick Haffey, Ellis E Golub
1Department of Biochemistry, University of Pennsylvania School of Dental Medicine, Philadelphia, PA 19104, USA.
Analytical Biochemistry
|June 10, 2008
Summary
A new Golddots assay quantifies proteins at nanogram levels using colloidal gold and nitrocellulose paper. This method requires minimal sample volume and offers a sensitive alternative to traditional protein assays.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Materials Science
Background:
- Accurate protein quantification is crucial in biological research.
- Existing protein assays often require larger sample volumes and more complex procedures.
- There is a need for sensitive, rapid, and low-volume protein detection methods.
Purpose of the Study:
- To develop and validate a novel nanogram-level quantitative protein assay.
- To evaluate the performance of the Golddots assay compared to conventional methods.
- To assess the assay's applicability to proteins with diverse physical properties.
Main Methods:
- Developed a protein assay utilizing colloidal gold binding to proteins on nitrocellulose paper.
- Quantified protein-gold complexes via densitometry of the resulting purple color.
- Calibrated the assay using weighed protein standards and compared it with the Pierce Micro BCA Protein Assay Kit.
Main Results:
- The Golddots assay demonstrates nanogram-level sensitivity for protein quantification.
- The assay requires minimal sample volume (2 mul) and protein amounts (1-5 mug).
- Results showed good correlation with weighed protein samples and the Micro BCA assay.
Conclusions:
- The Golddots assay provides a sensitive and efficient method for protein quantification.
- Its low sample requirement makes it suitable for precious or limited biological samples.
- This assay offers a valuable alternative for researchers needing rapid, high-sensitivity protein analysis.
