Journal
FOOD SCIENCE AND TECHNOLOGY INTERNATIONAL
Volume -, Issue -, Pages -Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/10820132221123437
Keywords
Radio frequency; black fungus powder; Salmonella; pasteurization; quality
Categories
Funding
- Key R&D Project of Shaanxi Province [2017ZDXM-SF-104]
- General Program of National Natural Science Foundation of China [31171761]
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This study investigated the effectiveness of RF heating in pasteurizing Salmonella in black fungus powder and the factors affecting the heating rate and uniformity. The results showed that electrode gap and initial a(w) significantly influenced the heating rate, but had no effect on uniformity. RF pasteurization was found to be an effective method for inactivating Salmonella in black fungus powder.
Radio frequency (RF) heating has been studied to inactivate bacteria in some powder foods. In this study, a 6 kW, 27.12 MHz RF system was used to pasteurize Salmonella in black fungus (Auricularia auricula) powder. The effects of different conditions (initial a(w), electrodes gaps, particle sizes) on RF heating rate and uniformity were investigated. The results showed that RF heating rate was significantly (p < 0.05) improved with decreasing electrodes gap and increasing initial a(w), and the heating rate was the slowest when the particle size was 120-160 mesh. However, these factors had no significant (p > 0.05) influence on heating uniformity. RF pasteurization of Salmonella in black fungus powder was also studied. The results showed that, to inactivate Salmonella for 5 log reductions in the cold spot (the center of surface layer), the time needed and bacteria heat resistance at designated temperature (65, 75, 85 degrees C) decreased with increasing a(w), and the first order kinetics and Weibull model could be used to fit inactivation curves of Salmonella with well goodness. Quality analysis results showed that although RF pasteurization had no significant (p > 0.05) effect on Auricularia auricula polysaccharide (AAP) and total polyphenols, obvious changes were found on color. Results suggested that RF pasteurization can be considered as an effective pasteurization method for black fungus powder.
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