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Food Qual Safet
    
Red cabbage washing with acidic electrolysed water: effects on microbial quality and physicochemical properties
Xia Chen*,**, Sophia Jun Xue*, John Shi*, Magdalena Kostrzynska*, Joshua Tang*, Evelyne Guévremont***, Sébastien Villeneuve*** and Martin Mondor***
*Guelph Research and Development Center, Agriculture and Agri-Food Canada, 93 Stone Road West, Ontario N1G 5C9, Canada, **College of Food Science and Engineering, Yangzhou University, Jiangsu 225127, China, and ***Saint-Hyacinthe Research and Development Centre, 3600 boul. Casavant Ouest, Québec J2S 8E3, Canada
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Abstract  
The effects of acidic electrolysed water (AEW) as ‘green’ technology on the microbiological and physicochemical properties of fresh-cut red cabbages were studied. Fresh-cut red cabbages and artificially inoculated red cabbages with Salmonella typhimurium DT104 were washed with distilled water (DW) and different available chlorine concentrations (ACC) of AEW for different times. AEW treatments significantly reduced the populations of native aerobic bacteria, molds, and yeasts, and artificially inoculated S. typhimurium DT104 compared with the DW-treated and untreated red cabbage samples. The effectiveness of AEW treatments was greatly enhanced with increasing ACC and treatment times. S. typhimurium DT104 were not detected in the washing water that were collected after the red cabbages treated by AEW. The surface colour, pH, and total phenolic contents did not significantly change when the red cabbages were washed with DW and AEW containing 100 mg/L available chlorine for 3 min. The anthocyanin contents and antioxidant activities of red cabbage were significantly reduced by 18.5 per cent for cyanidin, 22.1 per cent for pelargonidin, and 11.2 per cent for 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, however, the impacts on the nutritional benefits of red cabbage were considered as limited and acceptable. The optimal process condition of AEW for washing red cabbage was 100 mg/L ACC for 3 min. In these conditions, most of the native microflora were inactivated, and artificially inoculated S. typhimurium DT104 on the red cabbage were reduced by 40.2 per cent [3.67 log CFU/g (log10 colony-forming units per gram)] and with minimal losses of nutrients and antioxidant activity, as well as no requirement of decontamination treatment on the washing water after AEW treatment.


Key wordsred cabbage      acidic electrolysed water      decontamination      S. typhimurium DT104      physicochemical characteristics      anthocyanins
     
Received: 30 August 2018      Published: 10 November 2018
Corresponding Authors: John Shi, Guelph Research and Development Center, Agriculture and Agri-Food Canada, 93 Stone Road west, Guelph, Ontario N1G5C9, Canada.     E-mail: john.shi@agr.gc.ca
Cite this article:

Xia Chen, Sophia Jun Xue, John Shi, Magdalena Kostrzynska, Joshua Tang, Evelyne Guévremont, Sébastien Villeneuve and Martin Mondor. Red cabbage washing with acidic electrolysed water: effects on microbial quality and physicochemical properties. Food Qual Safet, 2018, 2(4): 229-237.

URL:

http://www.zjujournals.com/fqs/10.1093/fqsafe/fyy023     OR     http://www.zjujournals.com/fqs/Y2018/V2/I4/229


酸性电解水清洗红甘蓝对微生物和理化性质的影响

本文研究了绿色技术-酸性电解水(AEW)对鲜切红甘蓝中微生物和理化性质的影响。用蒸馏水(DW)和AEW(不同有效氯浓度(ACC))不同时间洗涤鲜切红甘蓝和用鼠伤寒沙门氏菌DT104人工接种的红甘蓝。与DW处理和未处理的红甘蓝样品相比,AEW处理显着减少了天然好氧细菌、霉菌和酵母及人工接种鼠伤寒沙门氏菌DT104。随着ACC和处理时间的增加,AEW的有效性大大提高。在经过AEW处理的红甘蓝之后收集的洗涤水中未检测到鼠伤寒沙门氏菌DT104。当用含有100mg / L有效氯的DW和AEW洗涤红色卷心菜3分钟时,表面颜色、pH和总酚含量没有显着变化。花青素含量和抗氧化活性显着降低,花青素降低了18.5%,天竺葵素降低了22.1%,2,2-二苯基-1-苦基肼(DPPH)自由基清除活性降低了11.2%,但红甘蓝的营养价值在可接受范围。洗涤红甘蓝的AEW的最佳工艺条件为100 mg / L 的ACC,持续3 min。在这些条件下,大多数天然微生物群落已失活,并且在红甘蓝上人工接种鼠伤寒沙门氏菌DT104减少了40.2% [3.67 log CFU / g(log10菌落单位/克)]并且损失最少的维生素和抗氧化活性,AEW处理后洗涤水无需去污处理。

关键词: 红甘蓝,  酸性电解水,  去污,  鼠伤寒沙门氏菌DT104,  理化特性,  花青素 
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