低温等离子体对蓝圆鲹在冷藏过程中的品质影响

Effects of atmospheric cold plasma on the quality of Decapterus maruadsi in cold storage process

目的研究低温等离子体(atmospheric cold plasma,ACP)对蓝圆鲹在冷藏过程中品质变化的影响。方法以蓝圆鲹为研究对象,采用介质阻挡放电低温等离子体设备对其进行处理(处理组),新鲜蓝圆鲹为对照组,4℃±1℃的条件下分别贮藏0、2、4、6、8、10 d,通过样品pH、持水力(water holding capacity,WHC)、菌落总数、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)、组胺含量、感官评价等指标来分析蓝圆鲹在冷藏期间的品质变化。结果随着贮藏时间的延长,两组样品pH呈先下降后上升的趋势;菌落总数由初始值2.97 lg CFU/g和3.00 lg CFU/g分别上升到6.10 lg CFU/g和6.72 lg CFU/g,处理组菌落总数上升速度较缓;TVB-N值和组胺含量均呈上升的趋势,且随着贮藏时间的延长,对照组比处理组上升速度更为明显;WHC和感官评分随着贮藏时间的延长而明显下降;TBARS值随着贮藏时间的延长而增加,且处理组的TBARS值始终高于对照组。结论低温等离子体处理能够有效地保持蓝圆鲹的鲜度,尤其是在抑制微生物的增殖方面有较大优势,能够延长蓝圆鲹的货架期至少2 d。本研究为延长蓝圆鲹的货架期提供了一定的理论基础。

Objective To analyze the effects of atmospheric cold plasma on the quality change of Decapterus maruadsi during cold storage.Methods Decapterus maruadsi was used as the research object and treated with a dielectric barrier discharge atmospheric cold plasma device(treatment group),fresh Decapterus maruadsi was used as the control group,and then stored at 4℃±1℃for 0,2,4,6,8,10 d,respectively.The samples pH,water holding capacity(WHC),total viable count,total volatile basic nitrogen(TVB-N),thiobarbituric acid reactive substances(TBARS),histamine content,sensory evaluation and other indicators were used to analyze the quality change of Decapterus maruadsi during cold storage.Results With the increase of storage time,the pH of Decapterus maruadsi decreased first and then increased;the total viable count increased from the initial values of 2.97 lg CFU/g and 3.00 lg CFU/g to 6.10 lg CFU/g and 6.72 lg CFU/g,respectively,and the total viable count increased slowly in the treatment group;the TVB-N value and histamine content showed an increasing trend,and with the extension of storage time,the increase rate of control group was more obvious than that of treatment group;the WHC and sensory scores decreased significantly with the extension of storage time;In addition,TBARS increased with the extension of storage time,and TBARS in the treatment group were always higher than those in the control group.Conclusion Atmospheric cold plasma treatment can effectively maintain the freshness of Decapterus maruads,especially in terms of inhibiting the proliferation of microorganisms,which can extend the shelf life of Decapterus maruadsi for at least 2 d.This study provides a theoretical basis for extending the shelf life of Decapterus maruadsi trevally.