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Home NEWS Science News Health

Is it safe to spin-dry leafy greens in a washing machine?

Bioengineer by Bioengineer
April 21, 2020
in Health
Reading Time: 3 mins read
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UMass Amherst researchers receive grant to study common practice at small New England farms

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Credit: UMass Amherst

Some of the nearly 1,000 small farmers in New England who grow leafy greens use a creative, efficient and cost-effective method of drying the fresh veggies after a triple dip in water: a conventional home washing machine.

The spin cycle of a retrofitted washing machine wicks the water off the greens to dry and keep them fresher longer. This discovery by farmers offered a way to automate the drying process without investing in a prohibitively expensive, commercial-grade spinner.

An important question lingers about this practice, which University of Massachusetts Amherst food scientists hope to answer: Is it safe?

“This has been a common practice among small producers of greens,” says Amanda Kinchla, a UMass Amherst extension associate professor of food science. “There are no regulations against this, but there is no data right now on the risk.”

Kinchla, a co-director of the USDA-funded Northeast Center to Advance Food Safety, and UMass Amherst food science colleagues Lynne McLandsborough and Matthew Moore have received a $71,000 grant from the Massachusetts Department of Agricultural Resources and the U.S. Department of Agriculture to study and address the microbial safety risks of processing leafy greens in washing machines. The Northeast Center to Advance Food Safety, led by the University of Vermont, promotes food safety education and technical support to small- and medium-size producers and processors in the northeast region.

The UMass Amherst team is building on work at the University of Vermont Extension, where the agricultural engineering program has been conducting workshops and creating posters for farmers on how to follow a hygienic design to convert washing machines into greens spinners and use them safely.

“My work is more impactful if I can address real-world stakeholder issues and leverage what already has been done,” Kinchla says.

Andrew Chamberlin, UVM Extension agricultural engineering technician, explains that bacteria and grime have the potential to accumulate if farmers don’t know how best to spin the greens and clean the machines. “We are trying to share best practices for food production,” he says.

For example, placing the greens in baskets that fit inside the machine results in fewer points of contact, reducing the risk of contamination, compared with putting the greens directly into the washing machine.

Kinchla’s team has converted four washing machines, based on Chamberlin’s directions, to study in the lab how contamination may occur, what kinds of microbes are present and how best to safely maintain, clean and sanitize the machine.

“We are examining whether the spin cycle on a washing machine has any more risk than commercially available, post-harvest leafy greens spinners,” Kinchla says.

Pragathi Kamarasu, a UMass Amherst Ph.D. candidate working with foodborne virologist Moore, says one of the challenges is finding the best sanitation options. “You can’t use very strong cleaners because the machine is being used for food,” she explains.

The researchers are designing the experiments to closely resemble the farmers’ practices and the environment and conditions in which they’re cleaning and drying the greens.

“We are still sorting through the logistics for the experimental research, such as how we can best introduce the contaminants that would mimic a real-world scenario,” Kinchla says.

The team aims to develop guidelines for farmers to maximize the safe and effective use of a washing machine to spin-dry greens. “That would alleviate concerns from regulators,” Kinchla says, “and avoid conflict between producers and regulators.”

###

Related video: https://umass.app.box.com/s/gtw3hzcaunbghb96eusw0h6g51rs9xym

Media Contact
Patty Shillington
[email protected]

Original Source

https://www.umass.edu/newsoffice/article/it-safe-spin-dry-leafy-greens-washing

Tags: Agricultural Production/EconomicsAgricultureBacteriologyBusiness/EconomicsFood/Food ScienceMedicine/HealthParasitologyPublic HealthToxicologyVirology
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