Resistance of vegetative cells and ascospores of heat resistant mould Talaromyces avellaneus to the high pressure treatment in apple juice

Inactivation of Aspergillus niger in Mango Nectar by High‐Pressure Homogenization Combined with Heat Shock

“…Besides that, the existing hydrostatic component in the HPH process in Stansted Fluid Power homogenizer results in the product residence time of 15 s (between the pump and the homogenizer valve). This time cannot be considered significant in the destruction of A. niger , since other authors, who studied mould inactivation in hydrostatic equipment, needed 60 min to obtain a 6 log reduction of Talaromyces avellaneus using 200 MPa at 17 °C (Voldrich and others 2004). Therefore, the effect of heating temperature and hydrostatic effect could not be considered relevant and it is reasonable to conclude that the inactivation must be due to a rapid decompression effect.…”

“…Conidia were harvested in sterile distilled water containing 0.05% Tween 80 (Rajashekara and others 1996). The suspension was agitated, filtered through sterile glass wool to remove hyphae and mycelium, centrifuged 2 times at 11,962.6 g, resuspended in sterile water and shaken with glass beads in ultrasonic bath at 0 °C in order to obtain free conidia (Voldrich and others 2004). The count of working suspension (10 8 conidia.mL −1 ) was performed in MEA with incubation at 35 °C/5 d. The suspension was stored at 3 °C and used during 6 mo.…”

Inactivation of Byssochlamys nivea ascospores in strawberry puree by high pressure, power ultrasound and thermal processing

“…The inactivation of Talaromyces avellaneus mold ascospores by 500-600 MPa HPP at 17-60°C, also seemed to follow a nonlinear pattern. However, fitting was only carried out with the conventional first order kinetics (Voldřich et al, 2004).…”

Combined effect of high pressure treatment and anti-microbial bio-sourced materials on microorganisms' growth in model food during storage

“…In a general manner, vegetative forms and fungal conidia are relatively sensitive; whilst ascospores are more resistant (Black et al, 2007;Osherov & May, 2001;Patterson, 2005). For example, ascospores of Talaromyces avellaneus and Byssochlamys nivea need pressure above 600 MPa, 60°C, 60 min to be inactivated (Butz, Funtenberger, Haberditzl, & Tauscher, 1996;Goh, Hocking, Stewart, Buckle, & Fleet, 2007;Voldrich, Dobias, Ticha, Cerovsky, & Kratka, 2004). In contrast, Goh et al (2007) showed that fungal conidia of Penicillium expansum, Rhizopus stolonifer and Fusarium oxysporum are strongly sensitive to high pressure (600 MPa, 18-20°C, 30-60 s).…”