Purification
The rapidly growing demand for GLP-1 receptor agonists is placing increasing pressure on downstream purification processes. As manufacturing volumes rise, process developers face a familiar challenge: how can more peptide be purified in less time without compromising product quality?
In preparative reversed-phase chromatography, stationary phase selection plays a central role in addressing this challenge. High chromatographic resolution is essential for achieving the required product purity, but resolution alone does not determine the efficiency of a preparative process. Resin loading can have an equally important impact on overall productivity. The more product that can be processed per chromatographic cycle, the fewer cycles are required for a given batch size.
YMC-Triart Prep C8-XP was developed specifically to combine chromatographic selectivity with high loading capacity. Its optimised C8 ligand chemistry is designed to maintain separation performance even as the amount of peptide loaded onto the stationary phase increases. This provides flexibility to optimise a purification process either towards maximum throughput or towards high purity, depending on the requirements of the individual process.
The influence of resin loading was investigated using Tirzepatide as a representative GLP-1 receptor agonist. The loading was progressively increased from 1.4% to 4.2%, 5.6% and finally 9.7% (g peptide/g resin). Despite the substantial increase in resin loading, strong purification performance was maintained. Even under the highest loading conditions, the separation remained sufficiently robust to achieve high product purity and recovery.
At a resin loading of 9.7%, a product purity above 93% was maintained while recovery remained above 80%. This means that almost 10 g of peptide can be loaded per 100 g of resin while retaining useful chromatographic performance.
These results also highlight that there is no single “ideal” loading for every purification process. Instead, loading can be used as a process development parameter. A lower loading may be selected when maximum purity from an individual chromatography step is the primary objective. In a multi-step purification process, however, accepting a moderate reduction in purity at a higher loading can be advantageous if subsequent steps provide the required final purity.
The implications become particularly relevant when moving towards larger-scale peptide manufacturing. Increasing the amount of peptide processed per cycle means that fewer chromatographic cycles are required for the same production volume. This can translate into higher throughput, reduced solvent consumption, lower cost per gram of purified peptide and improved overall manufacturing efficiency.
The Tirzepatide study therefore demonstrates an important principle in preparative chromatography: optimising a purification process is not simply about achieving the highest possible purity in a single injection. The balance between purity, recovery and loading capacity ultimately determines how productive the overall process can be.
By maintaining chromatographic performance at resin loadings approaching 10%, YMC-Triart Prep C8-XP provides process developers with additional flexibility to find this balance – whether the objective is a high-purity single-step purification or a productivity-driven multi-step process.
For more information, please refer to this Application Note.
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