I have checked the other questions about washing vegetables and fruit, but they don't mention baking soda. Google brings up only unreliable (random blogs that give no reference) or biased (baking soda brands) sources. So, here it goes: my grandmother swore by washing vegetable and fruit in a weak baking soda solution (I am talking about sodium bicarbonate NaHCO3, not baking powder).
I tend to follow her advice and wash fruit and vegs in a baking soda solution, but I just gave the matter some rational thought: how concentrated should the solution be? And what the heck and I doing anyway? Does it make any difference? It is not that I am obsessed with cleanliness, I just want to know whether baking soda in the water makes any difference, or if I am just wasting time (and soda).
The FDA does not suggest baking soda, just plenty of water. I have found a paper, Antimicrobial Activity of Home Disinfectants and Natural Products Against Potential Human Pathogens that indicates that baking soda and vinegar have a disinfecting action against bacteria and the polio virus, but they are consistently less effective than commercial disinfectants like Clorox (nothing strange here, otherwise why would we need Clorox, right?).
Any suggestions? Sources?
Best Answer
From what I can tell it seems like you are asking whether a baking soda solution is a good solution for cleaning fruits and vegetables. The answer to that would be not really, you're wasting good baking soda. Research shows that even purpose made commercial vegetable cleaners were no better than plain water for cleaning vegetables, it's the soaking time and technique used that makes the difference.
The only chemical tested that seems to make and difference is chlorine, which demonstrably reduced contamination on the outside of melons. However, you don't eat melon rinds, I wouldn't wash vegetables or fruit that I was going to eat in a chlorine solution because chlorine is unpleasant stuff and will probably ruin your flavors.
So washing your vegetables in baking soda, vinegar, or baking soda and vinegar is no better than washing them in plain old tap-water. It's better for your flavors that you do not as well. The only use I know of for baking soda in the preparation and cooking of green vegetables is that adding a bit when boiling green vegetables helps preserve their vibrant green flavor by neutralizing the acids that break down the chlorophyll. The trouble is it also turns them to mush, so I never use that method.