While researching why (note: I have this defect ? I am an engineer and usually try to quantify and qualify why. Mom says I was a pain), I ran across the California Barbecue Association FAQ on turkey. It may be found at
www.cbbqa.com/faq/10-5.html.
The meat of the FAQ I found under the question [What exactly does brining do for a turkey or chicken?] at the above source.
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There's a very good reason for that, according to Alan Sams, Ph. D. an associate professor of poultry science at Texas A&M University. Sams, who has published several papers on brining poultry, says it's basically an electric [electrolyte] thing.
"What is happening is that salt [the chloride part more than the sodium] penetrates into the muscle," Sams says. "The charged ions cause the muscle fibers to swell, and that sucks in even more water. It also binds the water to other protein, meaning the meat holds more water during cooking. That's what causes the juiciness effect.
"The three big benefits I've seen are increased juiciness, better flavor because of the saltiness and improved tenderness," Sams continues. "Brining generally creates a looser protein network. It's the discharge propulsion - the negative ions repelling each other and loosening the muscle fibers."
All of this was documented in a 1977 paper by five scientists from the University of Florida. They compared roast chickens that had been brined, chickens that had been soaked in plain ice water and chickens that had not been treated.
They found that the brined chickens scored much higher with testers in terms of flavor and tested better for juiciness and tenderness (the difference in tenderness was much greater for white meat than for dark). Microbial testing also showed slightly lower populations of various bacteria in the brined chicken than in the others.
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Additional quotations from the FAQ are
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[Does brining a turkey really make a difference in the taste?]
Ed Pawlowski--
I brined my first turkey this Thanksgiving-day (1997). It was better than any turkey I've ever done. This is one of the easiest ways of improving a turkey I've encountered and will not cook a turkey without brining, ever again.
Belly--
First time for me too. Best-tasting turkey that I ever cooked. I did one each way, (with and without brining) and the brining made a world of difference. An old dog learned a new trick today.
Thomas Street--
I smoked 2 turkey breasts for the big day. Brined one and just rubbed the other with spices. No doubt whatsoever. The rubbed bird was nice and tasty, but the brined one just exploded the old taste buds--much more moist and flavorful.
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I have a five gal (food quality) bucket that I normally use to make hard cider and the ?downstairs? fridge that I just plugged in. I?m going to try 2 gal water, 1cup table salt and 1cup brown sugar.
I plan on (a small amount of) seasoned dry apple wood for the smoke.
I?ve been reading up on decreasing the amount of water in the WSM for higher temperature smoking. (Thanks Ray - I read your notes and pictures. I am going to try it once (brine) and see how it works out. I also plan on higher temp, less water).