防腐剂协同紫外杀菌对油塔子杀菌效果及品质的影响

Effects of Antiseptic Co-UV Sterilization on the Bactericidal Effect and Quality of Youtazi

本文以油塔子为研究对象,通过不同防腐剂的添加量、紫外杀菌时间和紫外杀菌距离考察各因素对菌落总数、霉菌/酵母菌、大肠杆菌数量、色差和感官评分的影响。利用正交试验确定最佳杀菌工艺为:0.012%的Nisin添加量、紫外杀菌45min,距离为10 cm。此工艺条件处理后,结果表明:冷藏条件下,实验组油塔子在保藏19 d时,霉菌/酵母菌数量为2.85 log(cfu/g),超过国家标准限值2.18 log(cfu/g),而对照组油塔子在保藏9 d时,霉菌/酵母菌数量达到了2.28 log(cfu/g),为腐败油塔子;常温保藏条件下,实验组在第5 d时霉菌/酵母菌超标,而对照组第3 d时就测得其霉菌/酵母菌超过国家标准数量,为2.43 log(cfu/g)。本试验的复合杀菌处理将油塔子的货架期在常温条件下延长到4 d,在冷藏条件下延长到17 d,为油塔子工业化提供了理论依据。

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.