低温等离子体活化水发生设备及其应用效果试验  

Low temperature plasma-activated water generator and its application effect test

作　　者：谢焕雄 胡志超 吴惠昌 魏海 万良淏 戴阳 王海鸥 Xie Huanxiong;Hu Zhichao;Wu Huichang;Wei Hai;Wan Lianghao;Dai Yang;Wang Haiou(Nanjing Research Institute of Agricultural Mechanization,Ministry of Agriculture and Rural Affairs,Nanjing 210014,China;Nanjing Suman Plasma Technology Co.,Ltd.,Nanjing 211161,China;School of Food Science,Nanjing Xiaozhuang University.,Nanjing 211171,China)

机构地区：[1]农业农村部南京农业机械化研究所,南京210014 [2]南京苏曼等离子科技有限公司,南京211161 [3]南京晓庄学院食品科学学院,南京211171

出　　处：《农业工程学报》2021年第16期260-269,共10页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家重点研发计划(2018YFD0700102);国家自然科学基金资助(31872901);中国农业科学院科技创新工程;农业农村部现代农业装备重点实验室开放课题。

摘　　要：等离子体活化水(Plasma-Activated Water,PAW)具有广谱杀菌特性,可有效杀灭生鲜食品上的微生物,抑制其腐败变质。该研究基于介质阻挡放电等离子体发生原理设计了一套PAW发生设备,主要部件包括介质阻挡放电结构、通风散热通道、活化水流动通道、高压交流电源等。其中,介质阻挡放电结构采用圆柱形高压放电电极与平板形低压放电电极上下均匀间隙组配,不锈钢导流板与流动水膜一体化设计低压电极;圆柱形高压放电电极的散热采用双向逆流、内外散热通风双通道;高压交流电源的功率电路采用交流-直流-交流电路结构实现介质阻挡放电能量供给,控制电路可实现频率、电压、电流等参数监测与调控。将鲜切马铃薯片模拟感染大肠杆菌,并进行PAW杀菌保鲜试验,以验证所研制设备的应用效果。结果表明,在进水流量600 mL/min、电极空气间隙10 mm、物料与活化水质量比1∶20、电源电压137.4 V、杀菌时间4.72 min条件下,PAW对染菌马铃薯片的大肠杆菌杀菌率达(98.65±0.59)%,经过24 d贮藏后,不清洗组、蒸馏水清洗组和PAW清洗组染菌马铃薯片硬度分别为(3.01±0.84)、(3.54±0.81)、(4.70±0.48)N,色差值分别为22.08±1.05、13.21±1.43、7.35±0.82,相对电导率分别为(28.00±6.43)%、(26.72±2.07)%、(17.19±2.26)%,可溶性固形物含量分别为(6.850±0.120)%、(5.430±0.006)%、(3.080±0.006)%,腐烂率分别为(87.04±1.63)%、(76.32±1.60)%、(52.09±1.41)%,PAW清洗组染菌马铃薯片品质优于不清洗组、蒸馏水清洗组,PAW杀菌保鲜效果良好。该研究可为等离体子活化水杀菌技术研发及产业化应用提供参考。Plasma-activated water(PAW)has widely been accepted and proven to have broad-spectrum bactericidal properties.It can also effectively kill microorganisms on fresh foods,further inhibiting spoilage.The emerging low-temperature PAW sterilization has presented great potential for application in food production and safety control.However,the systematic design of PAW generating equipment is still lacking in recent years.In this study,a piece of novel equipment to produce low-temperature PAW was developed using the plasma generation via dielectric barrier discharge,in order to improve the level of PAW equipment development and application.The system of this equipment included the components of dielectric barrier discharge,ventilation channels of heat dissipation,flow channels of activated water,and the high-voltage alternating current power supply.The components of dielectric barrier discharge were composed of a cylindrical high-voltage discharge electrode and a flat-shaped low-voltage discharge electrode in an upper-down parallel configuration with the uniform gas gap.Among them,the flowing water film was integrated to be used as the low-voltage electrode,thereby realizing the uniform plasma generation,particularly for the continuous and stable production of activated water.Furthermore,the heat dissipation of high-voltage discharge electrode was employed two bidirectional-countercurrent ventilation channels inside and outside the electrode tube.A typical Alternating Current-Direct Current-Alternating Current(AC-DC-AC)structure was also designed as the power circuit of a high-voltage alternating current power supply,further to realize the energy supply of thee dielectric barrier discharge.In addition,the control circuit was utilized to monitor and adjust the operational parameters,such as frequency,voltage,and current.Some structural and working parameters of equipment were designed to be continuously adjustable within a certain range,including the inclination angle of stainless-steel plate for water flow,the air gap b

关 键 词：设计 试验 等离子体活化水 介质阻挡放电 马铃薯片 杀菌 保鲜 

分 类 号：TS205.7[轻工技术与工程—食品科学]