The development of volatile off-flavor compounds in soy protein isolates and plant meat during storage
Merga Nagassa1, Shudong He2, Shuyun Liu2
1School of Food and Biological Engineering, Engineering Research Centre of Bio-process, Ministry of Education, Key Laboratory for Agricultural Products Processing of Anhui Province, Hefei University of Technology, Hefei 230009, Anhui, PR China; Holeta Polytechnic College, P.O. Box 11, Holeta, Ethiopia.
Abstract:
The off-flavor associated with soy protein isolate (SPI) has negatively impacted the full acceptance of plant meat. This study investigated the factors that contribute to the development of volatile compounds as well as the volatile compounds responsible for the off-flavors. The main objective of this study was to investigate the formation of volatile off-flavor compounds in soy protein isolates and plant meat during storage. The samples were stored at 4 ± 0.5 °C, 25 ± 2 °C, and 37 ± 1 °C for durations of 0, 2, 4, 6, and 8 weeks, respectively. They were investigated using physicochemical properties, sensory, electronic nose (E-nose), and gas chromatography-mass spectrometry (GC-MS). The volatile off-flavor compounds were identified and plant meat exhibited significantly higher levels of off-flavors than SPI. Oil bodies, excessive moisture, elevated temperature, and extended storage were recognized as the main factors contributing to the development of off-flavors. Therefore, the extended storage of SPI and plant meat resulted in a continuous reaction that eventually caused the development of volatile off-flavor compounds.
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