Brent Miller, MSc here! Ever wonder why the resins you use are ACTUALLY the ones that you SHOULD use?
There is no one-size-fits-all approach to downstream process development. One of the first steps in optimizing chromatography is resin screening. This is often done at a small scale before scaling up linearly.
Some key considerations include: purity, yield, and impurity clearance. By screening varied resins you can determine which ones perform better over others in these categories. This is driven by your class of protein, physiochemical interactions at a molecular level, dynamic binding capacities, bead size/composition, and load capacity of the resin itself.
Choosing the right resin will enhance the efficiency of your process and reduce COGs, time, materials, labor, and provide high yield, high purity biologics.
An oft-overlooked component of this optimization is buffer composition. Balancing compatibility of the aqueous protein and the resin itself can impart drastic impacts on your purity and yield. Through DoE or QbD and a little know-how, you can find your sweet spot for elution and clearance. This is an integral part of refining your statistical models.
Although largely linear, when scaling up, resins may behave differently as well. Factors to consider at larger scales, informed by small scale studies, include linear flow velocity, retention of efficacy at scale, residence time, column volume/bed height/column diameter, and most importantly, facility fit restraints. If it can't be done at scale, you are wasting your resources in trying to fit a square peg in a round hole.
Custom tailoring your chromatography processes to meet your specific needs, while still retaining a level of flexibility is a balancing act, and as such, is tantamount in getting your drug substance out the door to impact lives beyond the supply chain and meeting contract requirements.
🧀 📠 : Approximately 10 pounds of milk is required to make one pound of cheese.
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4moAmazing News! Congratulations!