How HILIC Works: Resolving Closely-related Oligonucleotides and Other Applications for HILIC

At HTC-19 in Leuven, Belgium, LCGC International spoke to Jonathan Maurer from the University of Geneva, Switzerland about his presentation ‘How HILIC Works for Oligo Analysis”.^1,2

In this episode, Jonathan answers the following questions:

• In practical terms, how can the use of protic solvents help analysts resolve closely related oligonucleotide impurities that are difficult to separate using conventional methods?
• How could this revised understanding of HILIC retention mechanisms influence future analytical strategies for nucleic acid–based therapeutics in the biopharmaceutical industry?
• Can HILIC be used for other types of molecules commonly used for biopharmaceutical analysis?

Hydrophilic interaction chromatography (HILIC) is widely used for the analysis of therapeutic oligonucleotides because it offers high separation efficiency and compatibility with mass spectrometry (MS). However, method development is often limited by an incomplete understanding of the mechanisms responsible for analyte retention.

In his presentation, Jonathan Maurer described the relative importance of hydrogen bonding, ionic interactions, dipole interactions, and solvophobic effects in oligonucleotide retention on amide HILIC stationary phases. His findings demonstrated that hydrogen bonding and solvophobic interactions are the primary drivers of retention, whereas hydrophilic partitioning has only a limited contribution under typical analytical conditions. He also described how incorporating protic solvents into the mobile phase can improve selectivity and facilitate the separation of closely related oligonucleotide species.

These insights provide a revised mechanistic framework for HILIC separations, offering a more predictive approach to developing robust analytical methods for nucleic acid therapeutic,

References

1. Maurer J. How HILIC Works For Oligo Analysis. Presented at HTC-19 2026, in Leuven, Belgium. https://htc-19.com/programme/( accessed 2026-06-04).

2.Maurer, J.; Addepalli, B.; Gritti, F.; Lauber, M. A.; Guillarme, D.; Fekete, S. Retention Modeling of Oligonucleotides on an Amide-Based HILIC Column: A Descriptor-Driven Approach. J. Chromatogr. A2026, 467001. DOI:0.1016/j.chroma.2026.467001

Biography

Jonathan Maurer is a post-doctoral researcher at the Institute of Pharmaceutical Sciences of Western Switzerland (ISPSO), University of Geneva, working in the group led by Prof Davy Guillarme. His research focuses on developing advanced chromatographic methods for characterizing nucleic acid-based drug products in collaboration with Sanofi's mRNA Center of Excellence. He completed his Ph.D. at the University of Lausanne, where he specialized in mass spectrometry quantification of endogenous peptides and their clinical relevance. Jonathan has authored 15+ publications in high-impact journals (h-index 8), presented at international conferences, and received over CHF 125,000 in research funding. He is actively involved in scientific communities, serving as a board member of the ccCTA, as the founder and president of its Young Scientists’ Club, and as a regular reviewer for leading journals. Passionate about analytical chemistry and innovation, his work bridges academia and industry to advance pharmaceutical science.