Related Experiment Videos
Development of a novel compact sonicator for cell disruption.
K A J Borthwick1, W T Coakley, M B McDonnell
1Cardiff School of Biosciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3TL, UK.
Journal of Microbiological Methods
|December 14, 2004
Summary
A new compact ultrasonic cell disruptor using high-frequency (267 kHz) cavitation offers efficient microbial cell disruption for small samples. This novel device minimizes heating, preserving biochemical integrity, and outperforms traditional lower-frequency sonicators.
Area of Science:
- Biotechnology
- Biophysics
- Biochemical Engineering
Background:
- Traditional ultrasound cell disruptors (around 20 kHz) are large and cause significant heating, limiting their use for small sample volumes requiring biochemical integrity.
- Effective disruption of microbial cells is crucial for extracting intracellular components in various biotechnological applications.
Purpose of the Study:
- To develop and characterize a compact, high-frequency (267 kHz) ultrasonic cell disruptor for small sample volumes.
- To evaluate the efficiency of cell disruption and assess temperature increases compared to conventional low-frequency devices.
- To utilize modeling and experimental methods to optimize the device's performance.
Main Methods:
- Development of a compact tubular transducer (63.5-mm diameter, 6.5-mm thick) operating at 267 kHz.
- Exposure of Saccharomyces cerevisiae suspensions to cavitation in the novel device and a 20-kHz probe sonicator.
- Assessment of cell disruption via protein release and cell staining.
- Application of a 1-D transfer matrix model to predict mechanical resonance frequencies.
- Measurement of electrical resonance frequencies using admittance measurements.
- Detection of ultrasonic cavitation noise peaks using a hydrophone.
Main Results:
- The 267-kHz sonicator achieved greater yeast cell disruption than the 20-kHz probe sonicator for equivalent exposure times.
- Cell breakage efficiency, measured by protein released per dissipated watt, was twice as high at the predicted mechanical resonance frequency compared to electrical resonance frequencies.
- Minimal temperature rises were observed, preserving the integrity of biochemical products.
Conclusions:
- The developed compact, high-frequency ultrasonic device provides efficient cell disruption for small volumes with minimal heating.
- Resonance-based operation significantly enhances cell breakage efficiency, offering a basis for rational design of ultrasound cell disruption techniques.
- This technology is suitable for applications requiring the preservation of sensitive biomolecules.