Nova Zhang
Sound baths, also known as acoustic sound healing, have gained popularity in recent years for their therapeutic benefits. While the practice of sound baths is not new, its effectiveness in breaking up biofilms is a topic that has piqued the interest of researchers. Biofilms, as defined by Costerton et al. (1999) and Flemming et al. (2016), are coagulated masses of bacterial microorganisms that adhere to surfaces in the presence of moisture. They can form on any non-sterile surface, including medical devices, and are challenging to remove due to their high antimicrobial resistance. This has led to an exploration of novel approaches, including sound waves and ultrasound, to combat biofilms and enhance antimicrobial treatments.
| Characteristics | Values |
|---|---|
| Effectiveness of sound waves | Sound waves can assist in the elimination of bacterial biofilms, especially when combined with antibiotics. However, the effectiveness depends on various factors such as frequency, intensity, and vibration energy levels. |
| Ultrasound | Ultrasound is a type of mechanical energy that can be used to remove biofilms through acoustic cavitation and acoustic streaming, generating shear forces to disrupt the biofilm from a surface. |
| Acoustic Cavitation | Acoustic cavitation occurs when the local pressure of a liquid falls below the saturated vapour pressure, creating bubbles that can help disrupt and remove biofilms. |
| Bubble Stream | A stream of bubbles directed at a mounted biofilm can remove bacteria from a surface, but the velocity, gas fraction, and median bubble diameter must be considered for effective removal. |
| Safety | Sound waves are generally considered safe and user-friendly for biofilm control, but more research is needed to optimize their application for different surfaces. |
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What You'll Learn
Ultrasound and plasma activated water
Ultrasound is a form of mechanical energy that can be used to remove bacterial biofilms. This method, known as acoustic cavitation, involves using sound waves to generate shear forces that disrupt the biofilm from a surface. The properties of the liquid and the ultrasound itself, such as gas content, temperature, surface tension, frequency, and acoustic pressure, play a significant role in the type of cavitation generated and the effectiveness of ultrasonic biofilm removal.
Plasma-activated water (PAW) is another method that has gained attention due to its strong antimicrobial properties. PAW is created by treating water with plasma, either directly or indirectly, resulting in water that contains reactive species. PAW has been shown to be effective in inactivating bacteria and enhancing food product stability during storage.
When used in combination, ultrasound and PAW have a synergistic interaction, enhancing microbial inactivation. This has been studied in various contexts, including chicken meat and skin, crayfish, and biofilms. In chicken samples inoculated with Escherichia coli and Staphylococcus aureus, the combination of ultrasound and PAW inactivated a significantly higher number of bacterial colonies compared to using either method alone. Similarly, in crayfish, the combined treatment of ultrasound and PAW resulted in greater reductions in the natural microbiota compared to individual treatments.
The effectiveness of ultrasound and PAW together has also been demonstrated in inactivating biofilms. For example, a study by Yang et al. found that ultrasound treatment in combination with an antifungal agent effectively reduced mature Candida albicans biofilms. Another study by Wang et al. showed that low-frequency ultrasound enhanced the activity of vancomycin against methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-susceptible Staphylococcus aureus (MSSA) biofilms. These findings highlight the potential of using ultrasound and PAW together as a safe and environmentally friendly approach to combat the challenge of bacterial biofilm inactivation.
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Sound waves and antibiotics
Sound waves have been found to be effective in assisting antibiotics in eliminating bacterial biofilms. Biofilms are coagulated masses of bacterial microorganisms that adhere to surfaces when moisture is present. They can form on any non-sterile surface and are a cause of contamination in a wide range of medical and biological areas.
Ultrasound, a form of mechanical energy, can be used to remove biofilms through a process called acoustic cavitation. This involves using sound waves to create localized areas of high pressure, causing microbubbles to violently collapse and oscillate, generating shear forces that disrupt the biofilm. The ability to focus ultrasound waves allows for precise targeting of infections without causing damage to surrounding tissues.
Research has shown that low-frequency sound waves, in the range of less than 1,000 Hz, can be used to control biofilms in chronic wounds, indwelling devices, and airways. In one study, the simultaneous application of acoustic waves with antibiotics resulted in a significant reduction of Escherichia coli, Staphylococcus epidermidis, and Pseudomonas aeruginosa biofilms in urinary catheters.
Additionally, audible sound in the form of music has been found to influence microbial growth, metabolism, and antibiotic susceptibility. In one experiment, bacteria and yeasts exhibited increased antibiotic susceptibility when exposed to Indian classical music with a frequency range of 41-645 Hz.
The use of sound waves to assist antibiotics in eliminating biofilms offers a promising approach to addressing bacterial infections and the issue of antibiotic resistance. Further research is being conducted to optimize this method and understand the underlying mechanisms involved.
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Biofilms on medical devices
Bacterial biofilms are a common cause of contamination in medical devices, leading to device failure and various infectious and non-infectious complications. Biofilms are coagulated masses of bacterial microorganisms that form on non-sterile surfaces in the presence of moisture. They are highly resistant to antimicrobials and can develop on all types of devices, including urinary, endotracheal, and intravenous catheters, as well as implants.
The ability of microbes to form biofilms on medical devices increases their virulence, and the vast majority of human infections are biofilm-mediated. Biofilms can interfere with the effectiveness of antimicrobials and the immune response, leading to antimicrobial resistance and chronic infections. They also shield resident cells from desiccation, chemical perturbation, invasion by other bacteria, and killing by predators, making them challenging to eradicate.
Several methods have been proposed to prevent and eliminate biofilms on medical devices. One approach is to use low-energy surface acoustic waves generated by electrically activated piezo elements. These waves prevent microbial biofilm formation by creating a repulsive force that interferes with the attachment of microorganisms to the device surface. Another method involves coating the device surface with bactericides, quorum-sensing molecules, or peptides, or creating nanostructures.
Additionally, ultrasound treatment, also known as acoustic cavitation, has been shown to be effective in removing biofilms. Ultrasound uses mechanical energy and cavitation to generate shear forces that disrupt the biofilm from the device surface. However, ultrasound treatment has some disadvantages, including tissue damage, localized tissue heating, and the need for specialized staff and equipment.
While these methods show promise in addressing biofilms on medical devices, further research and optimization are needed to enhance their effectiveness and applicability.
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Acoustic energy frequency and intensity
The effectiveness of ultrasonic treatment in breaking up biofilms is influenced by the combination of acoustic energy frequency and intensity. Ultrasound is a form of mechanical energy that can be used to remove bacterial biofilms through acoustic cavitation and acoustic streaming, which generate shear forces to disrupt the biofilm from a surface.
The properties of the liquid and the ultrasound itself, including gas content, temperature, surface tension, frequency, and acoustic pressure, impact the type of cavitation generated. Acoustic cavitation occurs when the local pressure of a liquid falls below the saturated vapour pressure, resulting in the formation of small bubbles that grow and eventually collapse, creating a strong disruptive action on the biofilm.
The impact of ultrasonic treatment on biofilms is determined by both the intensity and frequency of the radiation. The cumulative energy of acoustic emissions during treatment has been positively correlated with biofilm disruption. For example, high-intensity focused ultrasound (HIFU) has been shown to effectively eradicate bacteria from substrates, making it a promising solution for root canal disinfection.
Additionally, the biofilm's properties, such as its viscoelastic nature, will also affect its removal. Studies have found that the different concentrations of alginate used in experiments exhibited varying responses to vibration frequencies, with standing waves observed on the surfaces of the samples at frequencies less than 1,000 Hz.
Further research is needed to optimize the parameters for effective biofilm removal from different surfaces and to understand the underlying mechanisms of ultrasonic cavitation in cleaning surfaces.
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Acoustic cavitation
The formation and collapse of bubbles during acoustic cavitation are influenced by the properties of the liquid and the ultrasound applied. Factors such as gas content, temperature, surface tension, ultrasound frequency, and acoustic pressure play a role in determining the type of cavitation that occurs. For example, when the local pressure of a liquid falls below the saturated vapour pressure due to the application of ultrasound, it creates a negative pressure known as the cavitation threshold, allowing bubbles to form and grow.
In the context of biofilm removal, acoustic cavitation has shown promising results. Biofilms are coagulated masses of bacterial microorganisms that can form on any non-sterile surface with moisture. They pose challenges in various medical and biological areas, from oral biofilms in the mouth to infections on medical devices. Acoustic cavitation, through the generation of shear forces, can effectively disrupt and remove these biofilms from surfaces.
The efficiency of biofilm disruption using acoustic cavitation depends on various parameters, and ongoing research aims to optimise this method for effective biofilm removal from different surfaces. The use of sound waves in combination with antibiotics has shown encouraging results in reducing bacterial biofilms, suggesting that acoustic cavitation may play a crucial role in combating antimicrobial resistance and improving treatment outcomes.
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Frequently asked questions
Biofilms are coagulated masses of bacterial microorganisms that adhere to a surface when moisture is present.
Acoustic cavitation occurs when the local pressure of a liquid falls below the saturated vapour pressure, which can be caused by applying ultrasound to the fluid. This creates bubbles that grow from small pockets of gas, generating shear forces that can disrupt biofilms.
Sound waves are safe and user-friendly. They can be optimized to control biofilms in chronic wounds, indwelling devices, and airways. They are also a promising approach to assist antibiotics in killing bacterial biofilms.
