Dynamical in-situ observation of the lyophilization and vacuum-drying processes of a model biopharmaceutical system by an environmental scanning electron microscope

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Publikace nespadá pod Pedagogickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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VETRÁKOVÁ Ľubica NEDĚLA Vilém RUNŠTUK Jiří TIHLAŘÍKOVÁ Eva HEGER Dominik SHALAEV Evgenyi

Rok publikování 2020
Druh Článek v odborném periodiku
Časopis / Zdroj International Journal of Pharmaceutics
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://doi.org/10.1016/j.ijpharm.2020.119448
Doi http://dx.doi.org/10.1016/j.ijpharm.2020.119448
Klíčová slova Bovine serum albumin; Freeze-drying; Vacuum-drying; Environmental scanning electron microscopy
Popis The paper discusses the real-time monitoring of the changing sample morphology during the entire lyophilization (freeze-drying) and vacuum-drying processes of model biopharmaceutical solutions by using an environmental scanning electron microscope (ESEM); the device's micromanipulators were used to study the interior of the samples in-situ without exposing the samples to atmospheric water vapor. The individual collapse temperatures (T-c) of the formulations, pure bovine serum albumin (BSA) and BSA/sucrose mixtures, ranged from - 5 to - 29 degrees C. We evaluated the impact of the freezing method (spontaneous freezing, controlled ice nucleation, and spray freezing) on the morphologies of the lyophiles at the constant drying temperature of - 20 degrees C. The formulations with T-c above - 20 degrees C resulted in the lyophiles' morphologies significantly dependent on the freezing method. We interpret the observations as an interplay of the freezing rates and directionalities, both of which markedly influence the morphologies of the frozen formulations, and, subsequently, the drying process and the mechanical stability of the freeze-dried cake. The formulation with T-c below - 20 degrees C yielded a collapsed cake with features independent of the freezing method. The vacuum-drying produced a material with a smooth and pore-free surface, where deep cracks developed at the end of the process.
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