Microbubbles are miniature, gas-filled bubbles that offer a simple solution to a nearly infinite range of applications. While they have been used for a variety of different things, Akadeum Life Sciences have found a way to harness their natural properties for cell separation technology.
Microbubble-based cell sorting allows smaller laboratories to scale up their diagnostic capabilities and isolate rare, fragile cells. These applications would not be possible if not for the size and structure of microbubbles.
In general, microbubbles can be made of a variety of materials. There is typically a gas center surrounded by a shell constructed of polymers, lipids, or proteins.
Akadeum’s microbubbles are a polydisperse mixture of thin glass microspheres with a gaseous core. We use glass-shelled microbubbles for two main reasons:
These glass microbubbles are then coated with antibodies or streptavidin to target cells.
Microbubbles can range in size from micrometers (μm), which are one millionth of a meter, to nanometers (nm), which are one billionth of a meter. The size has everything to do with the application. When it comes to cell separation the microbubbles must be in something of a Goldilocks Zone, a perfect medium where they are strong enough to float with a cell attached, but don’t float so quickly that they damage the cell viability.
At Akadeum, our polydisperse microbubbles are just thick enough to withstand the movement without bursting. Their size provides them enough buoyant force to float cells to the top of a fluid sample.
Microbubbles allow for the gentle transportation of extremely small cells or particles. They rely on the rules of physics and nothing else to get the job done, read more on the physics of microbubble sorting. Other methods can alter or damage cells, skewing the results of downstream applications or practices. Microbubbles are small, simple, and efficient, saving the user time and money whenever applicable.
Microbubbles rely on the physical properties of buoyancy to carry out their function. Buoyancy is the force that allows less dense molecules to float in liquid. If the buoyant force of microbubbles is enough to overcome the force of gravity acting on the target cells, the bubbles can float upwards.
Akadeum has harnessed these tendencies to develop an innovative microbubble cell separation technique called buoyancy activated cell sorting (BACS). BACS begins by mixing the microbubbles into the cell sample, which overcomes their natural buoyancy. This allows the bubbles to bind with as many target cells as possible throughout the mixture.
After capturing target cells, microbubbles will lift them to the top of the sample, leaving behind unwanted cells. Microbubbles and the cells attached to them are then removed through a process called aspiration.
Akadeum recommends using vacuum aspiration to remove the microbubbles and supernatant following enrichment. This process only tampers with the cells at the top of the solution, leaving the enriched sample untouched at the bottom of the container.
Other methods used for cell sorting include the following:
While all of these cell separation strategies have specific use cases, they all also have disadvantages associated with them.
BACS is fast, gentle, and relatively inexpensive in comparison to the other separation methods. While other methods require complex, costly machinery, BACS can be done with nothing but the separation kit. The microbubbles can be mixed directly into the sample container.
One of the greatest advantages of using microbubbles for cell separation is their ability to provide such a high throughput while still maintaining cell health and physiology. There is no harsh magnetic field or high intensity physical movement. The microbubbles are gentle and can be extremely beneficial when working with rare or fragile cell populations.
If your laboratory is trying to perform cell isolation with the intention of using those cells for downstream research or application, using BACS is one way to ensure that your cells will be viable after the process is complete.
Microbubbles and BACS can be used to sort high volume samples or isolate rare cell populations with high viability. , Akadeum offers cell separation kits for the following cell types:
Akadeum also offers a Human Red Blood Cell Depletion Kit that can be used to help purify sorted samples. This can work in conjunction with other cell separation methods to decontaminate an isolated sample for downstream applications.
There is also a Streptavidin Microbubbles Kit which scientists can customize with their own biotinylated antibodies. This allows for a much wider range of cell populations to be targeted as long as the lab has access to the necessary biomolecules.
Microbubbles optimize the cell separation process for time, ease, and overall cost. Using an efficient method that requires no additional steps or equipment can help to reduce the headache while still delivering accurate results.
For more information on microbubble technology and how they’re used for BACS, download the Ultimate Guide to Microbubble Technology on our resources page. This guide provides in-depth information on the processes and principles followed when performing cell separation with microbubbles.
If you’re still curious about how microbubbles are revolutionizing cell separation and would like to know more, speak with a scientist today.