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How clean is pre-washed spinach?

Ever wonder what that the words triple-washed or pre-washed on a bag of baby spinach mean? Not much, according to engineers at the University of California, Riverside. They discovered that small peaks and valleys in baby spinach leaves could be a key reason why there have been numerous bacterial outbreaks involving leafy green vegetables.

Past research has found about 20 percent of single food commodity outbreaks from 2003 to 2008 were attributed to leafy green produce. Contamination of such minimally processed and ready-to-eat produce is of concern since it is frequently consumed uncooked or raw.

Currently, the industry standard is to add 50 to 200 parts per million of bleach to the water used to rinse leafy green vegetables. But that is just a recommendation, not a requirement or regulation, Kinsinger said...

Click here to continue reading at universityofcalifornia.edu.