At a glance
Affinity Chromatography
Precipitation
Decision criteria
| Criterion | Affinity Chromatography | Precipitation | Verdict |
|---|---|---|---|
| Separation principle | Antibody capture via Protein A | Bulk protein recovery, IB recovery | Biospecific vs solubility shift |
| Throughput / scale | 50-500 L/hr | 1,000-50,000 L/hr | Precipitation much higher |
| Capital cost | $200k-$2M | $100k-$800k | Precipitation lower |
| Operating cost | High (resin + buffers) | Low ((NH4)2SO4 cheap) | Precipitation cheaper |
| Product purity ceiling | 95-99% single step | 60-80% single step | Affinity wins |
Quick verdict
Precipitation is the cheap bulk debulking step. Affinity is the expensive precision step. Different jobs, often combined.
Frequently Asked Questions
When should I choose Affinity Chromatography over Precipitation?
Use affinity when GMP biopharma purity is required and a high-selectivity ligand exists. Cost is justified by step count reduction.
When should I choose Precipitation over Affinity Chromatography?
Use precipitation for bulk recovery of inclusion bodies, industrial enzymes, or as a concentration step before chromatography. Inexpensive, scales linearly.
Can these two techniques be used together?
Yes — ammonium sulfate precipitation as a concentration / debulking step before an affinity column is a classic combination for low-titer feeds.
Which has lower OPEX at scale?
Precipitation costs $0.10-0.50/L of feed. Affinity (with Protein A) costs $5-50/g of product. Different cost models.
Read more on each technique
Try both in your flowsheet
Build a process with each option side by side and compare yield, purity, and cost.
Open untangle.bio