Introduction
Protein Analysis helps students move beyond simply producing proteins to actually evaluating their amount, purity, and identity. By combining quantitative and qualitative techniques, students learn how scientists verify that an experiment produced the right protein, at the right level, and in the right form for downstream applications.
How Protein Analysis fits into the larger scope
Protein Analysis follows Protein Expression and Purification and provides critical checkpoints before and after purification. Students use these methods to compare expression conditions, assess purification success, and confirm the presence of their target protein. This module reinforces the importance of measurement, validation, and interpretation in rigorous experimental design.
Protein Quantification
In this submodule, students measure how much protein they have produced using colorimetric or absorbance-based assays. They learn how standard curves, controls, and replicates support accurate quantification and how protein concentration data guide decisions about purification, loading volumes, and downstream experiments. This work emphasizes the role of quantitative reasoning in planning and interpreting protein studies.
SDS-PAGE electrophoresis
SDS-PAGE introduces students to a core technique for separating proteins by size. In this activity, they denature protein samples, load them onto polyacrylamide gels, and apply an electric field to resolve individual bands. By visualizing the resulting patterns, students evaluate protein purity, estimate molecular weight, and compare samples from different expression and purification steps, seeing how gel analysis informs each stage of the workflow.
Western Blotting and Imaging
In this submodule, students use Western blotting to detect specific proteins within a complex mixture. After transferring proteins from an SDS-PAGE gel to a membrane, they apply antibodies and visualization reagents to reveal their target protein as distinct bands. Through imaging and interpretation, students learn how antibody-based detection adds specificity beyond total protein staining and how Western blots are used in research, diagnostics, and biotechnology to confirm protein identity and expression levels.