To help remove downstream production roadblocks, the industry’s vendors and biomanufacturers are investing resources to address the problem. Much of this R&D is going into column resins.
Based on his years of experience in the industry, Adam Goldstein, senior manager, clinical operations purification development, Genentech (www.gene.com), said that the critical constriction causing production bottlenecks is the lack of high-capacity resins. “Current column resins can require as many as 10–12 loading cycles, which takes too much time,” added Goldstein. “If a resin existed that had 10 times the capacity, it could potentially cut the time involved in downstream purification by 80%.”
Many vendors are already researching solutions. According to Amitava Kundu, associate director, process development at Genmab (www.genmab.com), “we are working with a resin manufacturer that has developed a novel approach to increasing binding capacity of resins. I can say that in a couple of years, I believe we will be using ion-exchange applications with binding capacities in excess of 100 g/L. These improvements will be to the existing basic bind-and-elute resins currently in use. The capacity improvements will come from interior pores and the way ligands are put on a bead so they are accessible to the protein of interest.”
A top concern within the industry for many years has been the cost of chromatography steps for purification. This is driven by internal company pressures to reduce operating costs. Chromatography resin is a large expense that weighs heavily on balance sheets. And while manufacturers of chromatography resins warn that there may be few breakthroughs that lower the cost of these materials, more specialty resins may be produced that will ultimately lower the total cost of production by improving overall performance.
This is consistent with the views of Scott Wheelwright, Ph.D., president of Strategic Manufacturing Worldwide (www.smwbiotech.com). “Companies perceive they must increase the throughput of their operations. None of the respondents emphasized an increase in the volume of tanks, or even expanding the downstream operations. The interest is in pushing more product through a given facility. The suggested means to increase throughput include improved recovery, higher capacity for chromatography resins, and process changes to alternative unit operations that have higher throughput.”
As we double or triple the amount of target protein produced in each bioreactor batch we need to adjust downstream operations accordingly. This year’s survey shows that many in the industry expect this trend to continue, which will exacerbate downstream capacity problems. CMOs are particularly hard-hit because current volume bioreactors are overmatched to downstream processing areas that may have been built to meet lower yield requirements. Consequently, downstream areas are now undersized.
The BioPlan survey shows that there is a strong desire to move away from Protein A; concurrently there is a scarcity of potential solutions to increase capacity and lower costs of downstream processing.
Most likely, any breakthrough technology expecting to replace expensive chromatography, particularly Protein A, will need to address regulatory concerns in this very conservative industry. Relatively few companies, according to the survey, plan to migrate from Protein A. As such, in the short-term, we will probably see vendors offering incremental improvements in chromatography to match the upstream changes.