Product Design Manager, Fonterra Brands Innovation, Fonterra Australia Corporate Centre. 327 FernTree Gully Road, Mt Waverley, Victoria 3149, Australia.
Food Microbiol. 2010 Apr;27(2):210-9. doi: 10.1016/j.fm.2009.10.006. Epub 2009 Oct 13.
Chlorination continues to be widely used by the fresh-cut industry for washing and disinfecting minimally processed fruits and vegetables. However, as chlorination has been reported to produce unhealthy by-products such as, chloramines and trihalomethanes, many alternative methods have been reported in the literature. This study examined the use of silver and hydrogen peroxide as possible alternative to chlorination. The results revealed an obvious bactericidal effect of hydrogen peroxide, silver and their combination on spoilage organisms. Combination of electrochemically generated silver (5 ppm) and hydrogen peroxide (0.4 ppm) caused significant (P < 0.05) reduction in the total plate count (0.87 log), Pseudomonas (2.66 logs), Enterobactericeae (1.61 logs) and yeast and mould (1.60 logs) immediately after washing in comparison to water washed shredded lettuce. However, washing with chlorinated water (5 ppm) under same conditions revealed insignificant reduction in TPC (0.17 log), Pseudomonas (0.60 log), Enterobactericeae (0.15 log) or yeast and mould (0.81 log) counts. Results revealed also that both sources of silver (electrochemical silver and silver nitrate) have similar disinfecting effects, however, electrochemical silver maintained the quality of washed lettuce.
氯化消毒法在鲜切果蔬加工业中被广泛应用于清洗和消毒。然而，由于氯化消毒法会产生氯胺和三卤甲烷等有害副产物，因此文献中报道了许多替代方法。本研究考察了银和过氧化氢作为氯化消毒替代方法的可能性。结果表明，过氧化氢、银及其组合对腐败菌具有明显的杀菌作用。电化学生成的银（5ppm）和过氧化氢（0.4ppm）组合在清洗后立即对总平板计数（减少 0.87 对数）、假单胞菌（减少 2.66 对数）、肠杆菌科（减少 1.61 对数）和酵母和霉菌（减少 1.60 对数）产生显著（P＜0.05）的降低作用，而在相同条件下用含氯水（5ppm）清洗时，总平板计数（减少 0.17 对数）、假单胞菌（减少 0.60 对数）、肠杆菌科（减少 0.15 对数）或酵母和霉菌（减少 0.81 对数）的数量没有明显减少。结果还表明，两种银源（电化学银和硝酸银）具有相似的消毒效果，但电化学银保持了清洗后生菜的质量。
