Effects of Antiseptic Co-UV Sterilization on the Bactericidal Effect and Quality of Youtazi
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Abstract:
In order to explore the effects of different treatments (different antiseptics, UV sterilization time, UV sterilization distance) on the quality of Youtazi (aerobic bacteria, moulds/yeasts, Escherichia coli count, color difference and sensory evaluation), single factor and orthogonal experiments were employed to determine the optimal parameters. The results showed that the optimum sterilization conditions were Nisin addition 0.012%, sterilization time 45 min and sterilization distance 10 cm. At -4 ℃, the amount of mold/yeast bacteria reached 2.85 log (cfu/g) after 19 days of storage in the experimental groups, which exceeded the national standard limit of 2.18 log (cfu/g), while the amount of mold/yeast bacteria reached 2.28 log (cfu/g) only after 9 days in the control group; in ambient temperature, the amount of mold/yeast bacteria exceeded the standard limit on the 5th days in the experimental groups, while in the control group the amount of mold/yeast bacteria was 2.43 log (cfu/g) on the 3rd day, which exceeded the national standard already. The storage of Youtazi in ambient temperature and -4 ℃ were prolonged to 4 days and 17 days, respectively. This research could provide theoretical basis for the industrialization of Youtazi.
