Nofima, Norwegian Institute of Food, Fisheries and Aquaculture Research, N-1430 Ås, Norway.
Nofima, Norwegian Institute of Food, Fisheries and Aquaculture Research, N-1430 Ås, Norway.
Int J Food Microbiol. 2021 Jan 16;337:108928. doi: 10.1016/j.ijfoodmicro.2020.108928. Epub 2020 Oct 28.
Sponges are frequently used in kitchens and have been shown to harbor large numbers of bacteria, occasionally also pathogens. Less is known about kitchen brushes regarding usage and presence of bacteria. In the present study, the use of sponges and brushes was studied in a survey among 9966 European consumers in ten countries, and growth and survival of bacteria in sponges and brushes were examined in laboratory experiments. Sponges were the preferred hand-cleaning utensils for washing-up in the majority of countries, while brushes were most frequently used in Denmark and Norway. Consumers mostly change their sponges at regular times, but also sensory cues (looks dirty, smelly, slimy) and usage occurrences such as wiping up meat juices may trigger replacement. Besides cleaning the dishes, over a quarter of the dish brush users also use it to clean a chopping board after soilage from chicken meat juices. The water uptake and drying rate varied considerably, both between different sponges and between brushes and sponges, where brushes dried fastest. Campylobacter survived one day in all sponges and Salmonella more than seven days in two of three types of sponges. In the type of sponge that dried slowest, Salmonella grew on the first day and was always found in higher levels than in the other sponges. Non-pathogenic bacteria grew in the sponges and reached levels around 9 log CFU/sponge. In brushes all types of bacteria died over time. Campylobacter and Salmonella were reduced by more than 2.5 log to below the detection limit after one and three days, respectively. Bacteriota studies revealed a tendency for a dominance by Gram-negative bacteria and a shift to high relative prevalence of Pseudomonas over time in sponges. Both enumeration by agar plating and bacteriota analysis confirmed that the pathogens were in a minority compared to the other bacteria. Treatments of sponges and brushes with chlorine, boiling or in the dishwasher were effective to reduce Salmonella. We conclude that brushes are more hygienic than sponges and that their use should be encouraged. Contaminated sponges or brushes should be replaced or cleaned when they may have been in contact with pathogenic microorganisms, e.g. used on raw food spills. Cleaning of sponges and brushes with chlorine, boiling or dishwasher may be a safe alternative to replacing them with new ones.
海绵在厨房中经常使用,并且已被证明可以容纳大量细菌,偶尔也会有病原体。关于厨房刷子的使用和细菌存在情况,人们了解得较少。在本研究中,在十个国家的 9966 名欧洲消费者中进行了一项调查,研究了海绵和刷子的使用情况,并在实验室实验中检查了海绵和刷子中细菌的生长和存活情况。在大多数国家,海绵是手洗餐具中用于清洗的首选工具,而刷子在丹麦和挪威使用最频繁。消费者通常会定期更换海绵,但也会根据感官提示(看起来脏、有异味、发粘)和使用情况(如擦拭肉汁)更换。除了清洗餐具外,超过四分之一的洗碗刷使用者还会在鸡肉肉汁弄脏后用它来清洁切菜板。吸水性和干燥速度差异很大,不同海绵之间以及刷子和海绵之间差异都很大,其中刷子干燥速度最快。弯曲杆菌在所有海绵中存活一天,沙门氏菌在三种类型的海绵中的两种中存活超过七天。在干燥最慢的海绵类型中,沙门氏菌在第一天生长,并且其水平始终高于其他海绵。非致病菌在海绵中生长,达到约 9 对数 CFU/海绵的水平。随着时间的推移,所有类型的细菌在刷子中均死亡。弯曲杆菌和沙门氏菌分别在一天和三天后减少超过 2.5 对数,降至检测限以下。细菌群研究表明,随着时间的推移,海绵中革兰氏阴性菌的优势地位呈上升趋势,假单胞菌的相对丰度也有所增加。琼脂平板计数和细菌群分析均证实,与其他细菌相比,病原体数量较少。用氯、煮沸或洗碗机处理海绵和刷子可以有效减少沙门氏菌。我们得出的结论是,刷子比海绵更卫生,应鼓励使用刷子。当海绵或刷子可能接触到致病微生物(例如用于生食物溢出)时,应更换或清洁。用氯、煮沸或洗碗机清洗海绵和刷子可能是替代更换新海绵和刷子的安全选择。