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Keep kitchen knives clean to prevent bacteria from spreading: Study

You could be spreading disease causing bacteria if you are using knife to prepare food without washing them in between.

lifestyle Updated: Dec 16, 2015 12:45 IST
Bacteria latch on to the utensils commonly found in consumers’ homes and spread to the next item.
Bacteria latch on to the utensils commonly found in consumers’ homes and spread to the next item. (Shutterstock)

A new study warns that continued use of knives and graters without washing them is more likely to spread disease-causing bacteria.

Actually, bacteria latch on to the utensils commonly found in consumers’ homes and spread to the next item.

Researchers have known that poor hygiene in a consumer’s home can lead to food-borne illnesses, but considering what practices in the kitchen are more likely to lead to contamination has not been examined extensively.

Lead author Marilyn Erickson from the University of Georgia contaminated many types of fruit and vegetables in her lab - adding certain pathogens that often can be found on these foods, such as salmonella and E. coli.

Researchers found scrubbing or peeling fruits and vegetables did not eliminate contamination on the produce item but led to contamination of the brush or peeler. (Shutterstock)

Using a knife, Erickson would cut into things like tomatoes or cantaloupe and other types of produce to see how easily the bacteria could spread when the knife was continuously used without being cleaned.

Erickson and co-authors did not wash between cutting these different items. They also grated produce, such as carrots, to see how easily the pathogens spread to graters.

They found that both knives and graters can cause additional cross-contamination in the kitchen and that the pathogens were spread from produce to produce if they hadn’t washed the utensils.

The study also found that certain fruit and vegetables spread pathogens to knives to different degrees.

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“For items like tomatoes, we tended to have a higher contamination of the knives than when we cut strawberries,” Erickson said.

Erickson found that scrubbing or peeling items like melons, carrots and celery did not eliminate contamination on the produce item but led to contamination of the brush or peeler.

The study was published in the journal Food Microbiology.

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