Thursday, 21 February 2019, 12h00 MSG-025 MSSI Building Extension
Engineering the Cold Side of Biotherapeutics
Decreasing temperature is generally expected to decrease degradation kinetics. The complexity, however, of biological products (as proteins or cells) associated with multiple intricate phenomena that are triggered by cooling, often brings unanticipated results. For example, when a solution is freezing, the growth of the ice crystals causes all the solutes to concentrate, typically by one or two orders of magnitude. This potentiates interactions, crystallization, aggregation, pH shifts, and changes in osmotic pressure and ionic force, which lead to protein unfolding. The mechanistic contribution of each of these variables cannot be clearly deconvoluted, and it is also not easily correlated with product quality because of (1) the stochastic nature of nucleation, (2) the spatial anisotropy that is generated by freezing (and thawing or drying) and (3) the amplification of the previous factors by limited (or deficient) process control. Experimental and modelling approaches were developed to understand and anticipate some of these mechanisms within the ice structure. Computational Fluid Dynamics was used to access the microscale and virtually display local transient stresses, which was complemented by kinetic aggregation studies under ice-growth inhibition by isochoric cooling. This strategy has already contributed to clarifying important mechanisms for biotherapeutic’s degradation induced by freezing and used to assist the development of more rational formulations and optimized systems.
ABOUT THE PRESENTER
Miguel A. Rodrigues is Assistant Professor in Chemical Engineering Sciences at the Instituto Superior Técnico (IST) of the University of Lisbon. He graduated in Biological Engineering and received his PhD in Chemical Engineering (University of Lisbon) in 2006 on “Production of Particles for Controlled Release of Pharmaceutical Substances using Supercritical Fluids”. Before joining IST in 2009 he was an invited scientist at the University of Texas at Austin, where he developed “Controlled Freezing Processes for Producing Stable Protein Particles” sponsored by Pfizer. Since then his work has explored these two fields of Chemical Technology, namely, supercritical systems to improve stability and delivery of pharmaceutical products and new methods for cryopreservation (or cryoprocessing) of proteins and cells to enable emerging therapies. His research has motivated several collaborations in Europe and overseas, with colleagues from academia and industry. He has been invited to give seminars in R&D centres of pharmaceutical companies and in international conferences. He is also a co-founder of Smartfreez a Start-up company that is shaping cryopreservation methods in the biopharma industry.