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DTSTART;TZID=America/New_York:20260324T150000
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DTSTAMP:20260404T225639
CREATED:20260316T182439Z
LAST-MODIFIED:20260316T182439Z
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SUMMARY:ChE PhD Dissertation Defense: Victus Kordorwu
DESCRIPTION:Name:\nVictus Kordorwu \nTitle:\nUnderstanding the role of mucus in supersaturated drug delivery \nDate:\n03/24/2026 \nTime:\n03:00:00 PM \nCommittee Members:\nProf. Rebecca Carrier (Advisor)\nProf. Steve Lustig (Co-Advisor)\nProf. Mansoor Amiji\nSteven Castleberry\, PhD\nDennis Leung\, PhD \nLocation:\nCSC 333 \nAbstract:\nMany drugs entering clinical trials today are poorly water-soluble and rely on supersaturating formulations such as amorphous solid dispersions (ASD) to generate transient supersaturated states in the gastrointestinal tract to enhance the bioavailability. However\, correlating the rate and extent of drug precipitation observed in vitro to in vivo performance of supersaturating formulations has proven to be very difficult with limited success in establishing predictive relationships. This difficulty suggests that some aspects of the relevant in vivo environment which impact the performance of supersaturating formulations is possibly overlooked by current biorelevant dissolution methods used to evaluate the in vivo performance of these formulations. Mucus and mucins are key components of the in vivo environment and can undergo numerous types of interactions with different molecules and solutes (e.g.\, drugs\, polymers\, additives). Yet\, many in vitro biorelevant dissolution testing methods used to evaluate the performance of metastable formulations do not incorporate mucins\, leading to potential discrepancies between in vitro and in vivo drug performance prediction. \nDetailed in this work are mechanistic\, thermodynamic\, and translational investigations into the role of intestinal mucin as an active modulator of drug supersaturation stability and formulation performance. Mucin is shown to mimic and impact the ability of ASD polymers to stabilize supersaturated drug solutions. Mucin-mediated supersaturation translated to increased drug absorption through transport studies using Caco-2/HT29-MTX-E12 co-culture. Importantly\, mucin is found to alter the apparent performance of classical polymeric precipitation inhibitors\, either synergistically enhancing or antagonistically diminishing polymer effectiveness depending on the drug system\, thereby reshaping excipient rankings under physiologically relevant conditions. \nThe thermodynamics of drug-mucin interactions were explored using isothermal titration calorimetry (ITC) and ATR-FTIR 2D dimensional correlation spectroscopy. Small molecule binding exhibits two-event association behavior and is predominantly enthalpy driven\, consistent with hydrogen bonding and conformational ordering within the mucin network. Spectroscopic analyses reveal coordinated perturbations across hydroxyl\, amide\, carboxylate\, hydrophobic\, and saccharide associated domains\, confirming heterogeneous interaction environments and diffusion coupled structural rearrangements. \nBuilding on these mechanistic understanding\, a thermo-statistical Gibbs energy framework is developed to quantitatively predict the rank ordering and impact of mucin and excipients on drug precipitation across diverse compounds. The framework employs Gibbs energy curvature\, described as the second derivative of the Gibbs energy with respect to composition\, as a predictive descriptor of resistance to concentration fluctuations. Extension of this framework to the hydrophobic macrocyclic peptide\, cyclosporine A\, demonstrates that mucin also stabilizes peptide supersaturation through distinct entropy driven interaction pathways involving solvent restructuring. Curvature based predictions correlate with experimental precipitation outcomes and enable rational comparison of mucin and polymeric excipients as stabilizing agents. Overall\, this work demonstrates that intestinal mucus is an active modulator of supersaturation\, precipitation risk\, and formulation performance across both small molecule and peptide systems. Thus\, biorelevant dissolution testing should include appropriate mucus activity to enhance the predictive assessment of drug precipitation risk in supersaturated drug delivery systems. \n\nVictus Kordorwu is currently a Ph.D. candidate in Chemical Engineering at Northeastern University in Boston\, Massachusetts\, where he will graduate in April 2026. His doctoral research focuses on understanding the role of mucus in supersaturated drug delivery to improve formulation performance prediction. Victus holds a Master’s degree in Chemical Engineering and Technology from Dalian University of Technology in China and a Bachelor’s degree in Petroleum Engineering from Kwame Nkrumah University of Science and Technology in Ghana. \nDuring his doctoral studies\, he completed a 6-months research internship at Takeda Pharmaceutical Company\, where he gained expertise in RNA-lipid nanoparticle and oral solid dosage formulation and process development. His research contributions have resulted in peer-reviewed publications and presentations at conferences including the AIChE Annual Meeting\, Controlled Release Society \, the American Chemical Society and the Society for Biomaterials. \nHis research interests span formulation and process development\, biomaterials and soft matter systems and the development of predictive tools for complex chemical and biological systems. He is particularly interested applying chemical engineering expertise to solve problems across pharmaceutical development\, biotechnology\, energy related materials\, and other complex chemical systems. In the short term\, he looks forward to working as chemical engineer and formulation scientist in the pharmaceutical industry to deepen his expertise in pharmaceutical development. Outside of academics\, Victus enjoys playing bass and publishing bass tutorials\, kayaking and swimming.
URL:https://che.northeastern.edu/event/che-phd-dissertation-defense-victus-kordorwu/
LOCATION:333 CSC\, 360 Huntington Ave\, 333 CSC\, Boston\, MA\, 02115\, United States
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DTSTART;TZID=America/New_York:20260202T130000
DTEND;TZID=America/New_York:20260202T150000
DTSTAMP:20260404T225639
CREATED:20260122T212157Z
LAST-MODIFIED:20260202T205543Z
UID:5917-1770037200-1770044400@che.northeastern.edu
SUMMARY:ChE PhD Dissertation Defense: Eric Zimmerer
DESCRIPTION:Name:\nEric Zimmerer \nTitle:\nRechargeable alkaline Zn-MnO₂ batteries for grid-scale energy storage \nDate:\n02/02/2026 \nTime:\n1:00:00 PM \nCommittee Members:\nProf. Joshua Gallaway (Advisor)\nProf. Hannah Sayre\nLu Ma\nProf. Magda Barecka \nLocation:\n333 Curry Student Center \nAbstract:\nGrid-scale batteries enable the integration of renewable energy from intermittent sources and level demand on power plants\, but recent installations have been almost exclusively lithium-ion. Aqueous batteries\, such as the ubiquitous primary alkaline Zn-MnO₂ battery\, are free from the flammability\, toxicity\, and supply chain concerns that surround lithium. Rechargeable alkaline Zn-MnO₂ batteries currently rely on a low depth of discharge (DOD) of both the MnO₂ cathode and Zn anode\, however\, worsening their economics. \nDetailed in this work are developments to the mechanistic understanding and electrochemical performance of rechargeable alkaline MnO₂ cathodes cycling their full capacity of two electrons per Mn atom. During cycling the cathode undergoes intercalation and dissolution-precipitation type reactions involving disordered species\, making characterization difficult. Furthermore\, MnO₂ cathodes need to be modified with Bi to cycle reversibly\, but the mechanism through which Bi makes MnO₂ rechargeable is not well defined. \nAn interfacial region of disordered β-MnOOH is identified for the first time and found to be stabilized by Bi using operando extended x-ray absorption fine structure (EXAFS) and post-mortem selected area electron diffraction (SAED). Furthermore\, irreversible Mn₃O₄ formation is proven not to occur in Bi-modified alkaline MnO₂ electrodes using in-situ Raman spectroscopy and energy dispersive X-ray diffraction (EDXRD). An alternative degradation mechanism is investigated through characterization of Bi-doped MnO₂. Finally\, a cell with decoupled catholyte and anolyte is designed to prevent zinc poisoning of the MnO₂ cathode. \n\nEric Zimmerer is a member of the Analysis of Complex Electrochemical Systems (ACES) lab led by advisor Professor Joshua Gallaway. In February 2026\, Eric will defend his Ph.D. thesis on the development of low-cost and sustainable batteries for grid-scale energy storage. While at Northeastern\, Eric served as lab safety officer\, treasurer for the Graduate Student Council\, and a mentor for undergraduate researchers. During his time at Northeastern\, Eric specialized in the development and characterization of aqueous battery chemistries. Specifically\, he used synchrotron characterization techniques\, performed at Brookhaven and Argonne National Laboratories to characterize disordered structures present during battery cycling and to characterize the materials inside of sealed batteries under compression. After graduating\, Eric hopes to work in battery research in the San Francisco Bay Area.
URL:https://che.northeastern.edu/event/che-phd-dissertation-defense-eric-zimmerer/
LOCATION:333 CSC\, 360 Huntington Ave\, 333 CSC\, Boston\, MA\, 02115\, United States
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