Hot air-assisted radio frequency heating effects on wheat and corn seeds: Quality change and fungi inhibition |
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| Affiliation: | 1. SJTU-Bor Luh Food Safety Center, Department of Food Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China;2. Department of Food Science and Technology, 100 Wiegand Hall, Oregon State University, OR, USA;1. Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164-6120, USA;2. College of Mechanical and Electronic Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China;3. College of Engineering, China Agricultural University, Beijing 100083, China;4. College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China;1. Northwest A&F University, College of Mechanical and Electronic Engineering, Yangling, Shaanxi 712100, China;2. Department of Biological System Engineering, Washington State University, 213 L.J. Smith Hall, Pullman, WA 99164-6120, USA |
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| Abstract: | Hot air-assisted radio frequency (RF) heating has been proposed and studied as an alternative disinfestation method for grain seeds. In this study, hot air-assisted RF heating effects on fungi inhibition and its influence on physiological (seed vigor, germination rate) and biochemical (color, enzyme activity) qualities of wheat and corn seeds were further investigated. Results showed that high intensity hot air-assisted RF treatment (70 °C, 10 min) reduced seed vigor and germination rate for both wheat and corn seeds, but relatively mild intensity treatment (65 °C, 10 min) showed no significant influence on color and germination rate, and even enhanced enzyme activity (Superoxide dismutase-SOD, catalase-CAT and peroxidase-POD). Moreover, hot air-assisted RF treatment (65 °C, 10 min) reduced Aspergillus flavus by 2 and 3 log-scale (CUF/g) in wheat and corn seeds with the moisture content of 12.0%, and 3 and 4 log-scale for wheat and corn seeds when moisture content increased to 15.0%, respectively. These results indicated higher moisture content (aw) of grain seeds would benefit fungi inhibition for hot air-assisted RF treatment, and with proper control of treatment conditions, hot air-assisted RF heating has the potential to inhibit fungi and maintain physiological and biochemical quality of grain seeds. |
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| Keywords: | Hot air-assisted radio frequency (RF) Fungi Seed vigor Germination rate Enzyme activity |
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