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Citric acid

  1. Jun 24, 2005 #1
    hi,
    iam doing a investigation in my chemistry class. this investigation is totally independent & there is very little help available frm the teachers. so for the investigation they have given some suitable topics on which i can do my practical & other stuff. the topic i choosed is CITRIC ACID IN DRINKS/FRUITS.

    one of the question iam not sure abou8 is WHY CITRIC ACID EXISTS IN LEMON?
    the other question is DOES THE AMOUNT OF CITRIC ACID CHANGES OVER A PERIOD OF TIME & IF DOES THEN HOW?

    if any1 know something abou8 this topic pls try 2 answer my question.
    thanks
     
    Last edited: Jun 24, 2005
  2. jcsd
  3. Jun 25, 2005 #2
    citric acid is an intermediate in the metabolic TCA cycle, so it is not just specific to fruits. it is a high-energy compound, so maybe it is present in fruits in high amounts as a "reward" to the animal for dispersing the plant's seeds through defecation.

    citric acid is also a prochiral compound, which makes it interesting.

    limes also make limonene (responsible for the lime-smell) and lemons make lemonene, both a just steroisomers of the same compound. limonen is a terpene that is made through isoprene biosynthesis. the isoprenes come from mevalonate, a 6-carbon compound that doesn't look like its too far away from citric acid, so maybe there is a link there, i don't know. limonene has various properties (antibacterial, etc.)
     
    Last edited: Jun 25, 2005
  4. Jun 25, 2005 #3
    AFAIK it is at the peak amount of citric acid in the fruit when the fruit is @ its ripest.
     
  5. Jun 26, 2005 #4
    limes also make limonene (responsible for the lime-smell) and lemons make lemonene, both a just steroisomers of the same compound. limonen is a terpene that is made through isoprene biosynthesis. the isoprenes come from mevalonate, a 6-carbon compound that doesn't look like its too far away from citric acid, so maybe there is a link there, i don't know. limonene has various properties (antibacterial, etc.)


    hi thanx for replyin but the thng u told me can u plz explain me in bit simpler form cuz i didnt understand but thanx again for sort of helping me out
     
  6. Jun 26, 2005 #5
    hi ,wats the molecular formula of citric acid is it H3C6H5O7 or C6H8O7
     
  7. Jun 27, 2005 #6
    what you have posted is the same thing...

    here is a page on citric acid:

    http://en.wikipedia.org/wiki/Citric_acid
     
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