Acceleration of cell growth and ester formation by ultrasonic wave irradiation

Ultrasonic innovations in the food industry: From the laboratory to commercial production

“…High intensity ultrasound can break cells or denature enzymes, however low intensity ultrasound can improve mass transfer of reagents and products through the boundary layer or through the cellular wall and membrane (Sinisterra, 1992;Pitt & Rodd, 2003). Matsuura, Hirotsune, Nunokawa, Satoh, and Honda (1994) showed an increase in the fermentation rate of sake, beer and wine, when a relatively low intensity ultrasound was applied during the fermentation. The proposed mechanism is that the ultrasound (a great degassing tool) drives off CO 2 (produced during the fermentation) which normally inhibits the fermentation.…”

Effect of raffinose and ultrasound pulses on invertase release by free and immobilized Saccharomyces cerevisiae in loofa (Luffa cylindrica) sponge

“…Ultrasound has been used to extract and release intracellular enzymes such as invertase from S. cerevisiae (Balasundaram and Pandit, 2001), Phaffia rhodozyma (Persike et al, 2002), Aspergillus niger (Vargas et al, 2004) and acid phosphatase and ATPase from S. cerevisiae (Bucalon and Palma, 1990) and β-galactosidase from Lactobacillus (Wang and Sakakibara, 1997). In microbial cell cultures, high intensity ultrasound application ruptured cell walls, but low intensity ultrasound increased growth, promoted enzyme release, enhanced productivity in biological processes and, thus, could be a tool for improving biotechnological processes (Matsuura et al, 1994;Chisty, 2003). Cell immobilization has some advantages when compared with free cell culture.…”

Emerging Technologies for Targeted Food Processing

“…Increased fermentation rates could be observed because of the US-assisted removal of CO 2 , which otherwise can inhibit fermentations (Matsuura et al 1994). …”

“…In the case of the preparation of biomaterials for further processing by fermentation or enzyme digestion, US-assisted pulverization of cell matrices is used to facilitate the release of substrates or nutrients (Matsuura et al 1994;Mawson and Knoerzer 2007;Wu et al 2000).…”