Pineapple and carbonation problems

Discussion in 'General Brewing Discussions' started by Smilin Brewer, Jun 16, 2013.

  1. Smilin Brewer

    Smilin Brewer New Member

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    I brewed a plain light wheat beer and split it in to two 5 gallon corny kegs. I added 3 cups of fresh pineapple juice ( boiled for 10 minutes) to one of the kegs. I set both kegs at 14 psi. The keg with out the pineapple was carbonated in 7 days. At 14 days I turned the pressure up to 20 psi on the pineapple keg. It was been 7 days now and I'm seeing a little bit of carbonation. Has anyone had something like this happen? Should I go to 30 or 40 psi??
     
  2. LarryBrewer

    LarryBrewer Active Member

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    I wonder if the keg has a small leak?
     
  3. Nosybear

    Nosybear Well-Known Member

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    I'm more curious about the taste the pineapple brings. That's a lazy brewer's kind of fruit - I can get it pre-pasteurized - in cans, no additives, it its own juice!
     
  4. Smilin Brewer

    Smilin Brewer New Member

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    I checked for leaks it seems to be holding fine. I pushed the pressure to 30 psi and I'll see what happens. I will let you known how it tastes if I ever get it carbonated.
     
  5. social_misfit

    social_misfit New Member

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    I know stuff with sugar takes more to get carbonated, I was reading about doing a lemonade in a soda keg they say to carbonate the water then add a simple lemonade syrup after

    so I am think it maybe the sugar

    just my thoughts

    S_M
     
  6. Smilin Brewer

    Smilin Brewer New Member

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    Here is a picture with the pineapple on the right it has been at 30 psi for 24 hours after being at 20 psi for 1 week after being at 14 psi for a week. The left is the same wheat beer at 14 psi
     

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  7. LarryBrewer

    LarryBrewer Active Member

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    Could be something is interfering with head retention, but jeeze this is starting to sound like a case for Sherlock Holmes. Must eliminate all the variables. Are the taps or lines different?
     
  8. The Brew Mentor

    The Brew Mentor Well-Known Member

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    How full is the keg? How cold?
    Cold beer accepts co2 a lot better than warm or room temperature.
    I've noticed that is I have an over full keg that the carbonation takes longer.
    Pull a couple pints and see if that changes anything.
    Also, if you need to get it carbed up quicker, pull the keg, lay it horizontally with the gas side post down so it's under the beer, set the pressure to 15psi and then "Rock the Baby" for about 5 minutes.

    Brian
     
  9. EvanAltman36

    EvanAltman36 New Member

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    Is it possible that the Bromelain in the pineapple is impacting the head retention and/or carbonation? And is the beer absolutely not carbonated, or simply not developing head? Anyway, I know that pineapple has a lot of Bromelain, which is a digestive enzyme that will break down proteins (like Z and LTP1, referenced in the article below from this site on 12/19/09). Is it possible that the pineapple enzymes are simply breaking up those proteins and killing your head retention?

    http://www.brewersfriend.com/2009/12/19 ... retention/
     
  10. Smilin Brewer

    Smilin Brewer New Member

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    Thanks for all of the information. It is helpful. I keep the refrigerator at about 40 degrees but it is old and fluctuates and the keg is full with 3 or 4 inches of space at the top. The enzyme in pineapple is interesting I will look into that some more. I will have to come up with some kind of fix. I can't throw beer away.
     
  11. Nosybear

    Nosybear Well-Known Member

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    Found a paper on the Internet on Bromelain: It denatures in five minutes at 70° C. I don't know what that would do to the flavor of the pineapple but my SWAMBO's pineapple upside down cake is pretty good.... Anyone up for trying that?
     
  12. chessking

    chessking New Member

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    SWAMBO?

    She Who Always Must Be Obeyed?
     
  13. Nosybear

    Nosybear Well-Known Member

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    You got it! Besides, it makes the acronym pronounceable.
     

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