Protein A column regeneration is typically carried out with:

Question

BlackTom AI · Accepted Answer

Protein A resins are regenerated using strong alkali: NaOH (commonly at or above 0.5 M) is the industry-standard cleaning‑in‑place (CIP) agent because it both removes tightly bound protein contaminants and provides effective viral and microbial inactivation.

Relevant knowledge points and concepts:
- Protein A affinity chromatography binds antibodies via Fc interactions; over repeated cycles, host cell proteins, DNA, lipids and aggregated antibody can foul the resin.
- Regeneration/CIP must both desorb/release strongly bound contaminants and sanitize the matrix without irreversibly damaging the ligand.
- NaOH is a strong base that hydrolyzes and solubilizes proteinaceous foulants and inactivates microbes/viruses; many commercial Protein A ligands and resins are validated for repeated exposure to ~0.1–0.5 M NaOH, with 0.5 M widely used as a robust regeneration concentration.

Step-by-step reasoning:
1. Fouling problem: bound contaminants require a denaturing/solubilizing agent to restore binding capacity.
2. Choice of agent: NaOH at high concentration breaks peptide bonds/denatures proteins and solubilizes aggregates, making it an effective CIP reagent that also sanitizes.
3. Practical validation: resin manufacturers typically test and specify NaOH concentrations their products tolerate; many recommend or validate CIP cycles at 0.5 M NaOH (or higher for engineered ligands), making ≥0.5 M a conservative, standard regeneration condition.
4. Outcome: NaOH restores column capacity and ensures biosafety between runs.

Why the correct answer is correct:
High-concentration NaOH addresses both removal of difficult foulants and viral inactivation and is broadly validated for Protein A resins, so it is the standard regeneration approach.

Why the other options are incorrect:
- High chaotropes (6 M urea/guanidine) can denature and strip or damage Protein A ligands and are not standard CIP for routine regeneration.
- High salt (1–2 M NaCl) can reduce nonspecific binding and help elution of some species but does not remove strongly bound protein aggregates or sanitize the column, so it is not a typical sole regeneration method.
- NaOH in ethanol: ethanol can be used for storage or occasional sterilization but combining ethanol with NaOH is not a routine recommendation for regeneration and may affect ligand stability.

Conclusion: The correct, industry-standard regeneration method is High NaOH (≥0.5 M), matching the provided answer.

Protein A column regeneration is typically carried out with:单项选择题

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