Protein Expression & Analysis

Titering Phage – Counting Something Invisible with Something Only Slightly More Visible

Titering Phage – The Plaque Assay Phage display is a molecular technique used to isolate binding or interaction partners to molecules of interest from an extensive library. Such libraries are often derived from the variable regions of native B-cell antibody-binding genes cloned into phage DNA. A single round of phage display panning involves many important steps. However, the…

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Proteomics and Good Mass Spectrometry Data


It is currently possible to analyze thousands of proteins in a single sample using mass spectrometry (MS) and a database of predicted protein sequences, referred to as ‘bottom-up’ proteomics. With this technology, you can measure protein levels and interactions. Also, you can examine changes in post-translational modifications (PTMs) and isoforms (in an unbiased manner). Working with…

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Examining Cell Interactions with Surface Plasmon Resonance (SPR) and Identifying Epitopes using SPR-Mass Spectrometry (MS)

surface plasmon resonance

Surface plasmon resonance (SPR) offers highly efficient, label-free detection for quantifying biomolecular interactions in real-time. Two exciting SPR variants that have sprung up in recent years are SPR for cellular analysis and SPR-mass spectrometry (SPR-MS). SPR for cellular analysis allows you to study how cells attach to different substrates and each other, while SPR-mass spectrometry…

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Key Analytical Challenges for Antibody Drug Conjugates

antibody drug conjugate analysis and characterization

Currently, there are more than 75 antibody drug conjugates (ADCs) in various stages of pre-clinical and clinical development. The combination of a targeted antibody coupled with a cytotoxic small-molecule drug (via  a flexible linker) makes for a lethal and specific oncologic drug product. However, an ADC is a heterogeneous cocktail of molecules with a range…

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