Recent advances in dual effect of power ultrasound to microorganisms in dairy industry: activation or inactivation

Akdeniz, Vildan; Akalın, A. Sibel

doi:10.1080/10408398.2020.1830027

Cited by 30 publications

(19 citation statements)

References 124 publications

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“…As the duration of sonication increased, the cells lost their activity or start to get reduced in number due to cell damage (Kesari and Behari 2008;Akdeniz and Akalın 2020). With a relatively short duration of exposure to low-frequency ultrasound, the induced membrane permeability and cellular damage appear to be temporary and reversible, which More and Ghangrekar 2010 suggested that the use of low-frequency ultrasound (5 min) for mixed anaerobic sludge is the reason for an improvement in the efficiency of MFC relative to non-treated MFC.…”

Section: Current Density and Power Density For Mfc Variants With Ad1-elb Strainmentioning

confidence: 99%

Ultrasonic pre-treatment of Bacillus velezensis for improved electrogenic response in a single chambered microbial fuel cell

et al. 2021

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Various microbial strains and techniques are being used to improve power production in microbial fuel cells. Cow dung is a peculiar source of anaerobic and micro-aerophilic organisms that were employed in this study to isolate exo-electrogenic microorganisms. To validate their exo-electrogenic nature, all eight visually distinct bacterial single-cell colonies were tested using the ferrocyanide reduction assay, which resulted in the selection of one bacterial strain AD1-ELB with the ability to reduce ferrocyanide for further biochemical, physiological and electrochemical characterization. The selected strain AD1-ELB was identified as Bacillus velezensis by 16 s rRNA gene sequencing. When used in a single-chambered MFC, the isolated AD1-ELB strain produced a maximum open-circuit voltage of 455 mV with a maximum current density of 51.78 µA/cm 2 and maximum power density of 4.33 µW/cm 2 on the 16th day. Bacillus velezensis AD1-ELB strain was treated with lowfrequency ultrasound (40 kHz) for 1, 2, 3, 4, and 5 min to assess the effect of ultrasonic pre-treatment on an isolated pure culture-based microbial fuel cell. A 3-min exposure to low-frequency ultrasonic therapy resulted in an increase in maximum power of 4.33 µW/cm 2 with a current density of 51.78 µA/cm 2 in the MFC, which decreases significantly after 4 and 5 min. Thus, the overall power density achieved was 1.89 times greater than in MFCs with untreated strain. These findings support the use of low-frequency ultrasonic stimulation to improve the performance of microbial fuel cell devices and are restricted to the pure, single-cell strain AD1-ELB, with the potential for variation if some other isolated strain is utilized, hence requiring further study to determine its relative variations.

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Section: Current Density and Power Density For Mfc Variants With Ad1-elb Strainmentioning

confidence: 99%

Ultrasonic pre-treatment of Bacillus velezensis for improved electrogenic response in a single chambered microbial fuel cell

et al. 2021

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Section: Resultsmentioning

confidence: 99%

“…These results occurred due to changes in pressure, and temperature, which can cause cell wall rupture and thinning of the cell membrane (22,27,28). Also, due to the action of free radicals DNA damage can occur (22,27,28). Table 4 shows the TVC (total number of bacteria), and the reduction Please note that this is an unedited version of the manuscript that has been accepted for publication.…”

Section: Resultsmentioning

confidence: 99%

The Influence of High-Power Ultrasound and Bactofugation on Microbiological Quality of Milk

Juraga

Stulić

Pavičić

et al. 2021

Food Technol. Biotechnol. (Online)

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Research background. The application of high power ultrasound, combined with a slightly increased temperature on raw whole cow milk, skimmed cow milk, and skimmed cow milk that passed the bactofugation process were analyzed. A combination of those techniques, ultrasound and the bactofugation of milk was conducted to achieve the microbiological accuracy that is usually achieved by the pasteurization process. Experimental approach. The milk samples (200 mL) were treated for 2.5, 5, 7.5 and 10 minutes with high-power ultrasound (200 W and 400 W) with a frequency of 24 kHz. The treatments were conducted with a constant duty cycle of 100 %. Temperature levels during the treatments were 20 °C, and 55 °C. The count of somatic cells was analyzed for the aerobic mesophilic bacteria, as well the number of Enterobacteriaceae, Escherichia coli, and Staphylococcus aureus cells. Results and conclusions. The best result from the perspective of the reduction of the total count of bacteria was achieved by high-power ultrasound with a power of 400 W treated for 10 minutes. High reduction of Enterobacteriaceae, E. coli, and S. aureus cells was achieved in ultrasound treatment of raw whole, skimmed, and skimmed cow milk with a power of 200 and 400 W regardless of a treatment time. Novelty and scientific contribution: High-power ultrasound with a combination of bactofugation as a pretreatment for milk and with a slightly increased temperature (up to 55 °C) is much more economical than the pasteurization process, while it preserves the sensory and physical-chemical properties of milk.

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“…In addition, cavitation is known to produce a series of mechanical effects, such as particle collisions and cell wall disruption, which promote penetration of the solvent into the sample matrix and increase the mass transfer rates of anthocyanins [33]. The ultrasonic power could weaken the cell wall [25], increasing the contact between anthocyanins and solvent, which brought about a reduction of the sonication time. Ultrasonication has been applied to accelerate the fermentation process and improve the cell growth of S.…”

Section: Optimization Of Ultrasonic Conditions By Rsm Analysismentioning

confidence: 99%

“…It is the first line of defense for cells to be persecuted by the external environment or treatment. To determine whether ultrasonic treatment affects the integrity of the C. Therefore, ultrasound process parameters must be truly quantified and controlled to achieve the desired level of cell permeability [25,41,42]. In addition to direct microbubble contact, microstreaming around cavitating microbubbles provides a second possible origin of mechanical stress on the cellular membrane influencing permeability [41].…”

Section: Effect Of Ultrasonic Treatment On Cell Permeabilitymentioning

confidence: 99%

Effect of Ultrasound on L-leucine Production by Corynebacterium Glutamicum in Fed-batch Culture

Zhang

Chen

Sun

et al. 2020

Preprint

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Background: Various process intensifications are proposed to improve process efficiency, quality, and safety of fermented products. With the market significantly growing, the production process of L-leucine needs significant improvements to increased productivity and yield. Ultrasound, a process intensification, is an emerging and fast-growing technology due to its wide range of applications in food science and fermentation industry. Results: By optimizing the time points and parameters of ultrasound, the biomass of Corynebacterium glutamicum CP was significantly improved. The response surface methodology was adopted to create prediction profiler model and optimize sonication conditions. C. glutamicum CP fermentation at conditions of ultrasonic power of 94 W/L, frequency of 25 kHz, interval of 31 min, and duration of 37 s produced 52.89 g/L of L-leucine in 44 h, increased by 21.6% compared with the control. The production performance of L-leucine was also improved under ultrasonic treatment. Moreover, the cell morphology of C. glutamicum CP were more irregular, elongated, and swollen cells under the ultrasonic condition. The cell permeability of C. glutamicum CP and the activity of key enzymes with ultrasonic treatment were significantly higher than the control. Conclusions: We successfully obtain the optimum ultrasonic conditions to produce L-leucine in fed-batch culture. The results indicate that ultrasonication is an efficient intensification process for enhancing fermentation to produce L-leucine from C. glutamicum CP.

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Recent advances in dual effect of power ultrasound to microorganisms in dairy industry: activation or inactivation

Cited by 30 publications

References 124 publications

Ultrasonic pre-treatment of Bacillus velezensis for improved electrogenic response in a single chambered microbial fuel cell

Ultrasonic pre-treatment of Bacillus velezensis for improved electrogenic response in a single chambered microbial fuel cell

The Influence of High-Power Ultrasound and Bactofugation on Microbiological Quality of Milk

Effect of Ultrasound on L-leucine Production by Corynebacterium Glutamicum in Fed-batch Culture

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