Efficient microbial growth control is essential in the realms of bioprocess development and continuous manufacturing. Utilizing a turbidostat allows for the maintenance of a constant cell density, responding to turbidity feedback in real time and adjusting the influx of fresh medium. This results in highly stable and reproducible culture conditions, enhancing overall productivity.
Advanced Features of the BioXplorer 100
The BioXplorer 100 is a cutting-edge platform that integrates turbidostat capabilities through its BioVIS probe and the WinISO software-controlled pumping system. This article explores how to utilize this parallel bioreactor system to maximize high-density cultivation of Escherichia coli.
Calibration for Accurate Measurements
To ensure the accuracy of biomass measurements at elevated densities, a non-linear calibration curve is crucial. High biomass levels can introduce optical scattering effects, leading to non-linear relationships between probe output and actual cell density. A properly calibrated system allows the BioXplorer 100 to maintain a stable E. coli concentration under continuous growth conditions.
Continuous Cultivation with the BioXplorer 100
In the field of biotechnology, controlling microbial growth in liquid cultures is vital. Traditional batch cultures often fall short in providing the consistency needed for industrial applications, as they are prone to fluctuations in nutrient availability and metabolic states.
Turbidostats, such as the BioXplorer 100, address these challenges by enabling continuous cultivation under controlled conditions. The system automatically dilutes the culture when turbidity surpasses a predefined threshold, maintaining a steady biomass.
Real-Time Monitoring and Control
The BioXplorer 100’s built-in BioVIS probe provides real-time optical attenuation measurements, allowing for automated growth regulation through the WinISO software. This system can handle a culture volume ranging from 50 to 150 mL, and even up to 400 mL in the larger BioXplorer 400 model.
Upon reaching a predetermined biomass setpoint, the WinISO software activates the dilution control, introducing fresh medium and expelling effluent to sustain a consistent culture volume.
Ensuring Accurate Calibration
For precise operation of the turbidostat, it is vital to calibrate the probe signal to optical density (OD600). This is particularly important at high cell densities, where the relationship between turbidity and OD becomes non-linear.
To establish a reliable calibration curve, samples are taken at various culture densities and analyzed offline using a spectrophotometer. The data collected allows researchers to compare the raw probe signal with the offline-measured OD600 values and develop a non-linear calibration model for accurate biomass interpretation.
The Non-Linear Calibration Model
As cell density increases, the BioVIS output does not rise linearly with OD600. This non-linearity is particularly pronounced at OD600 values exceeding 1.5, where multiple scattering effects limit the amount of transmitted light detected. By implementing a non-linear calibration model, the BioXplorer 100 can accurately monitor biomass across its full operating range, thus enhancing turbidostat control at high cell densities.
Benefits of the BioXplorer 100 for High-Density Cultivation
The BioXplorer 100 excels in providing controlled, stable, and reproducible high-density cultivation. It supports steady-state operation with minimal manual intervention, making it an ideal choice for a variety of applications, including adaptive evolution studies, strain development, process optimization, and high-value biomolecule production.
Researchers and process developers seeking a reliable solution will find the BioXplorer 100 to be a scalable platform that delivers robust continuous microbial cultivation. Its design allows for long-duration, reproducible cultures, ultimately boosting experimental confidence.
The Complete BioXplorer Solution
The BioXplorer 100 and its counterpart, the BioXplorer 400, function as effective turbidostat systems capable of real-time culture density control across a wide range of media and applications. Both systems are equipped to maintain a stable biomass setpoint under continuous cultivation when paired with the in situ BioVIS optical attenuation probe and automated dilution control via WinISO.
The platform ensures consistency in cell physiology and reliable performance over extended periods. It also facilitates true parallel cultivation, making it an invaluable tool for process development, strain optimization, and high-value biomolecule production.
Conclusion
The BioXplorer platform represents a significant advancement in automated high-density cell cultures. With its integration of real-time monitoring, automated control, and dynamic configuration, it stands out as a superior choice for researchers and developers in biotechnology. By providing a reliable and scalable solution, the BioXplorer 100 enhances the efficiency of microbial cultivation, paving the way for innovative developments in the field.
- Scalable Solution: The BioXplorer 100 offers a flexible platform for diverse applications.
- Real-Time Monitoring: Continuous turbidity measurements ensure optimal growth conditions.
- Automated Control: The WinISO software streamlines dilution management.
- Non-Linear Calibration: Ensures accurate biomass monitoring at high densities.
- Enhanced Productivity: Supports long-duration, reproducible cultures with minimal manual intervention.
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