3.2. Analysis of furan formation in the soy sauce model systems
3.2.1. Effect of sterilization on the formation of furan in soy sauce
Changes of furan concentration in the fermentation of soy sauce are shown in Table 2. Furan levels of all samples increased throughout the sampling, carried out every 5 days for 30 days.
The levels of furan in the sample after sterilization were higher than those of non-sterilization. The furan formation under nonsterilization ranged from 0.45 ± 0.03 ng/mL to 27.65 ± 0.96 ng/mL, while the levels of furan under sterilization ranged from 2.17 ± 0.73 ng/mL to 86.21 ± 1.40 ng/mL. In particular, the concentration of furan fermented for 30 days increased by 211% after sterilization compared to without sterilization. Looking at the increase of furan after the 15-day point, it was showed the largest absolute increase occurred between 15 days and 20 days, by 70% and 93% without and with sterilization, respectively. Based on the results, it was confirmed that furan levels were significantly increased with sterilization.