等离子体活化水对鲜切菠萝品质的影响

鲜切菠萝极易被腐败菌污染,造成品质下降,货架期缩短.为在不引起鲜切菠萝品质劣变的前提下,有效杀灭腐败菌,延长货架期,该研究首先采用大气压低温等离子体处理蒸馏水得到等离子体活化水(plasma-activated water,PAW),再利用PAW对鲜切菠萝进行清洗,分别考察PAW的制备时间、制备功率以及清洗时间对鲜切菠...

Effects of Plasma-activated Water on Quality of Fresh-cut Pineapples

Fresh-cut pineapples are easy to be contaminated by spoilage bacteria,leaing to the decline in fruit quality and the reduction in shelf life.To reduce the initial colony number of fresh-cut pineapples without causing quality change,plasma-activated water(PAW)was generated by atmospheric pressure cold plasma(ACP)treatment,and its germicidal efficacy for fresh-cut pineapples were investigated.The effects of PAW preparation time,PAW preparation power and PAW washing time on colony number were researched.The optimal sterilization conditions by single factor and orthogonal test showed that PAW preparation time of 4 min,PAW preparation power of 70 W,PAW washing time of 20 min,the colony number of fresh-cut pineapples dropped from 3.035 lg(CFU/g)to 2.604 lg(CFU/g).The chrominance,firmness,sensory quality,pH value and vitamin C content of fresh-cut pineapple were measured,the results showed that PAW could effectively reduce the initial colony number of fresh-cut pineapples while maintaining its original quality.The shelf life of fresh-cut pineapples was predicted by acceleration test,results indicated that,at storage temperature of 4℃,the shelf life of fresh-cut pineapple treated by PAW was extended from 8.06 h to 9.03 h.