摘要
目的 探究紫外预杀菌处理对生鲜猪肉品质的影响.方法 设置不同包装条件(裸露包装和保鲜袋包装)、照射距离(6、9 和 12 cm)和照射时间[裸露包装(3、5、10 s),保鲜袋包装(6、10、14 s)],通过测定菌落总数、感官评定、色差、挥发性盐基氮(total volatile basic nitrogen,TVB-N)、硫代巴比妥酸反应物(thiobarbituric acid reactive substances,TBARS)值等指标,探究紫外处理在保持生鲜肉品质的同时降低猪肉初始微生物数量的可行性.结果 裸露包装生鲜猪肉最佳紫外照射条件为照射距离 9 cm处理 10 s,保鲜袋包装猪肉的最佳紫外照射条件为照射距离6 cm处理14 s,可使生鲜猪肉初始微生物数量分别降低0.44 logCFU/g和0.61 logCFU/g,但对脂肪氧化、感官及色泽没有显著影响.结论 紫外预杀菌处理在降低猪肉初始微生物数量的同时,能够减缓TVB-N值的增加及脂质氧化,并对生鲜肉感官品质、色泽没有显著影响,使猪肉的货架期延长 3～4 d,在猪肉保鲜领域具有潜在应用价值.
Abstract
Objective To study the effects of ultraviolet pre-sterilization on the quality of fresh pork.Methods Different packaging conditions(bare packaging and fresh-keeping bag packaging),irradiation distance(6,9 and 12 cm)and irradiation time[bare packaging(3,5,10 s),fresh-keeping bag packaging(6,10,14 s)]were set in this study.The feasibility of ultraviolet treatment to reduce the number of pork microorganisms and prolong the shelf life of pork was explored by measuring the total number of colonies,sensory evaluation,color difference,total volatile basic nitrogen(TVB-N)and thiobarbituric acid reactive substances(TBARS).Results The results showed that the best ultraviolet irradiation conditions for naked packaged fresh pork were 9 cm-10 s,and the best ultraviolet irradiation conditions for fresh-keeping bag packaged pork were 6 cm-14 s,which could reduce the initial microbial number of fresh pork by 0.44 logCFU/g and 0.61 logCFU/g,respectively,but had no significant effect on fat oxidation,sensory evaluation and color.Conclusion The ultraviolet pre-sterilization treatment can reduce the initial number of microorganisms in pork,slow down the increase of TVB-N value and lipid oxidation,and has no significant effect on the sensory quality and color of fresh meat.The shelf life of pork is prolonged by 3-4 d,which has potential application value in the field of pork preservation.
维普
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