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The MOLNÁR-INSTITUTE eBook Traces the Evolution of HPLC into Modern Digital Procedures
Berlin: – The MOLNÁR-INSTITUTE for Applied Chromatography has announced a new eBook, Digital Analytical Procedure Development: Past, Present, and Future, published by LCGC International, the leading global communications portal for the separation sciences.
The eBook provides a definitive guide to modern separation science based on high-performance liquid chromatography (HPLC), leveraged by computer modeling, tracing both the historical development of HPLC and current advanced methods.
From Horváth to UHPLC: Modernizing HPLC Method Development Through Computer Modeling
Over the past 60 years, liquid chromatography has evolved from Csaba Horváth’s 1964 high-pressure system into modern UHPLC operating at up to 15,000 PSI. Advanced columns and low-dispersion systems now make complex gradient separations routine. However, method development remains a time-consuming challenge – especially for modern combination drugs and biopharmaceuticals like monoclonal antibodies, antibody-drug conjugates and oligonucleotides.
To overcome these challenges, laboratories increasingly rely on HPLC computer modeling to optimize separations, build robust analytical procedures, boost productivity, and reduce resource consumption.
This eBook offers a scientific perspective on the evolution of HPLC and its current landscape, demonstrating through several practical examples how fundamental chromatographic theories support HPLC modeling in achieving fast and smooth method development.
Invention of HPLC
Starting from the catastrophic drug safety failures like the thalidomide (Contergan) tragedy in the 1960s, the Introduction tells the fascinating story of how high-performance liquid chromatography (HPLC) redefined analytical science. It highlights how HPLC arrived where it is today through the pioneering work of four key scientists: István Halász, Csaba Horváth, Lloyd R. Snyder, and Imre Molnár. Their passion for scientific understanding drove HPLC from a high-pressure experiment into the foundational analytical framework that enables today’s life sciences.
At West Germany’s Saarland University, István Halász established a pioneering program that trained scientists to develop liquid chromatography analytical procedures capable and reliable enough for routine industrial use. Across the Atlantic at Yale University, Csaba Horváth used his chemical engineering expertise to develop a high-pressure liquid chromatograph with defined flow, defined packing, and controllable operating parameters – marking the invention of the first modern HPLC instrument.
Expanding HPLC into new domains
Horváth also defined the two HPLC operating elution modes, isocratic and gradient, that marked chromatography’s shift from trial-and-error practice to a science-driven, parameterized process. In isocratic elution, mobile-phase strength stays constant for the entire run, whereas in gradient elution mobile-phase strength increases over time according to a programmed profile – giving the analyst precise control over selectivity, resolution results and run time.
In 1975, Csaba Horváth recruited Imre Molnár, a young analytical chemist who had completed his PhD under István Halász at Saarland University. Horváth and Molnár shared a vision of expanding HPLC into entirely new domains, such as protein separations. In 1977, they reported groundbreaking reversed-phase HPLC separations of amino acids and peptides on bonded non-polar phases. This served as proof that peptide-level information could be read directly in the liquid phase with practical resolution and run times – opening the way for future peptide mapping and today’s biopharmaceutical characterization.
From Predictive Relationships to DryLab®
The last link in the chain came in the early 1980s, when Csaba Horváth introduced Imre Molnár to Lloyd R. Snyder, who had built the intellectual scaffolding for modern LC with his «Principles of Adsorption Chromatography» (1968) that established solvent-strength, band-broadening, and nonionic interactions as quantitative parameters, and «Introduction to Separation Science» (1973), that placed liquid chromatography inside a coherent framework of separation mechanisms.
Snyder’s technical trademarks were turning raw data into predictive relationships and insisting on practical and useable models, such as the solvent-selectivity triangle and linear-solvent-strength relationships.
Under Snyder’s influences and core discipline of reducing problems to their essentials, the DryLab team developed the first software edition in 1986 as a computerized modeling environment for HPLC method development.
The DryLab® Virtual Laboratory
As the name suggests, DryLab® enables users to construct “dry” virtual laboratory experiments, using “wet” LC only to run a structured, minimal set of input runs alongside model-predicted verification experiments. This ability to explore optimal conditions in software has saved immense time and resources by eliminating hundreds of traditional trial-and-error runs. Under this approach, gradient profile, temperature, pH, buffer system, and column chemistry are treated as integrated coordinates in an explicit Design Space, rather than isolated local settings. Since then, DryLab® has evolved in various ways:
- Multidimensional modeling:Introduced simultaneous gradient-time × temperature (tG-T) modeling in 1996, followed by expanding optimization into multiple gradient-time × temperature × pH and gradient-time × temperature × ternary composition dimensions (2008).
- Quantitative robustness assessment and risk management tool:Added tolerance levels and risk-evaluation to quantify and ensure long-term method stability before moving to routine use (2012).
- System-level Design Space Comparison:Allowed the alignment of various column chemistries, stationary phase batches, pH and buffer systems, and instrument-to-instrument variability to make method transfer completely predictable (from 2017).
DryLab® Use Cases
Four technical chapters illustrate how systematic Design Space Modeling have moved HPLC beyond trial-and-error, to a systematic, lifecycle-controlled analytical procedure development.
Chapter 1 lays out an AQbD-aligned framework: gradient-first, model-justified method design along with the definition of a Method Operable Design Region (MODR) enabled by in-silico robustness assessment.
Chapter 2 extends this to multidimensional modeling across small molecules and biologics – showing rapid redevelopment (e.g., 90-min methods shortened to 5 min), modeled robustness, and virtual transfer between HPLC and ultra-high performance UHPLC.
Chapter 3 operationalizes lifecycle management, showing how a compact 12-run tG × T × pH program expands into a three-dimensional Design Space “Cube.” This cube defines a verified operating region with specific tolerance limits and a well-defined analytical control strategy for predictable method transfer.
Finally, Chapter 4 applies Design Space Comparison to questions of interchangeability – across columns, stationary phase lots, instruments, elution modes, and buffers—ensuring that column selection, change control, and troubleshooting rest on overlapping MODRs, thus facilitating fact-based decision-making.
Concluding Remarks
The eBook concludes with a short Q&A Section with Imre Molnár.
Asked to define the most persistent challenges in HPLC method development, Dr. Molnár identifies:
- The problem of analyzing highly polar degradants along with hydrophobic late-eluters in one run
- Unpredictable changes when switching systems or columns
- Hidden method issues that only show up at validation or transfer stages.
“DryLab tackles all three by using disciplined gradient design, by mapping method behavior as a Design Space rather than one setpoint, and by quantifying robustness before validation by using full-factorial “what-if” analysis across tG, T, pH, flow, %B-start/end), for example”. Imre Molnár further explains “This converts «keep it stable» into explicit tolerances and a concrete control strategy”.
About The MOLNÁR-INSTITUTE
Founded in 1981, The MOLNÁR-INSTITUTE develops DryLab®4, a software for UHPLC modelling for a world-wide market. Its powerful modules gradient editor, peak tracking, automation, robustness and Design Space Comparison allow for the most sophisticated method development across modern pharma industries. Analytical scientists use DryLab®4 to understand chromatographic interactions, to reduce analysis time, to increase robustness, and to conform to Analytical Quality by Design (AQbD) principles, according to the recently published ICH Q14 regulatory framework.
The MOLNÁR-INSTITUTE is a registered partner of the US-FDA, CDC and many other regulatory bodies. DryLab®4 pioneered AQbD long before regulatory agencies across the world encouraged such submissions. Widely implemented by thought leaders, the software contributes substantially to the paradigm shift towards a science and risk driven perspective on HPLC Quality Control and Assurance.
Further information at: http://www.molnar-institute.com/
About LCGC International
Founded in 1983, LCGC International is the leading global media brand for separation science professionals, enhancing the productivity, efficiency, and the overall value of separation techniques globally. With its commitment to editorial excellence, it has pioneered innovation across a broad portfolio of digital and print platforms.
LCGC monthly print publication, website, newsletters, ebooks, webcasts, interviews, and special issues, provide unbiased peer-reviewed articles, trusted troubleshooting advice, and best-practice applications solutions, while LCGC International covers all key growth areas in the field of separation science. LCGC International’s practical information assists lab-based analytical chemists and influential chromatographers to improve productivity and enhance their proficiency, giving them a competitive advantage for the real-world challenges they face.
Resources
See Digital Analytical Procedure Development: Past, Present, and Future to read and download the eBook.
Discover more about The MOLNÁR-INSTITUTE for Applied Chromatography.
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