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Updated: May 23, 2026

In Situ Microscopy for Real-time Determination of Single-cell Morphology in Bioprocesses
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In Situ Microscopy for Real-time Determination of Single-cell Morphology in Bioprocesses

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Optical sensor enabled rocking T-flasks as novel upstream bioprocessing tools.

Jose R Vallejos1, Martina Micheletti, Kurt A Brorson

  • 1Center for Advanced Sensor Technology, Department of Chemical, Biochemical and Environmental Engineering, University of Maryland, Baltimore, Maryland 21250, USA.

Biotechnology and Bioengineering
|April 5, 2012
PubMed
Summary

Novel disposable cell culture vessels, known as Process Scouting Devices (PSDs), were characterized for oxygen transfer. Rocking T-flasks showed comparable performance to wave bioreactors, suggesting seamless scalability.

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Area of Science:

  • Biotechnology
  • Bioprocess Engineering
  • Cell Culture Technology

Background:

  • Disposable cell culture vessels (Process Scouting Devices or PSDs) are widely used for lab-scale studies and seed culture.
  • Limited engineering characterization and monitoring tools hinder understanding of PSD oxygen transfer capabilities.

Purpose of the Study:

  • To characterize the mass transfer (k(L)a) of sensor-enabled static and rocking T-flasks.
  • To compare these with other non-instrumented PSDs.
  • To develop an empirical correlation for k(L)a in rocking T-flasks.
  • To conduct a scale-down study comparing rocking T-flasks and wave bioreactors.

Main Methods:

  • Mass transfer characterization (k(L)a) using sensor-enabled T-flasks.
  • Comparison with non-instrumented PSDs (CultiFlask 50®, spinner flasks, SuperSpinner D 1000®).

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  • Development of a mass transfer empirical correlation for rocking T-flasks.
  • Scale-down study matching k(L)a between rocking T75-flask and a 10 L wave bioreactor (Cultibag®).

    • Main Results:

    • Established k(L)a for static and rocking T-flasks, comparing them to other PSDs.
    • Developed a novel empirical correlation for k(L)a in rocking T-flasks.
    • Observed similar dissolved oxygen (DO) and pH profiles, cell density, and protein titer in the scale-down study.
    • Identified a negative correlation between cell growth and protein productivity in the scale-down study, potentially due to hydrodynamic stress differences.

    Conclusions:

    • Rocking T-flasks exhibit comparable oxygen transfer capabilities to wave bioreactors.
    • The developed mass transfer correlation aids in understanding and predicting performance.
    • Rocking T-flasks can be effectively integrated with wave bioreactors for seamless scale-up.
    • Hydrodynamic stress may influence cell growth and productivity outcomes during scale-up.