Citric acid

  • Thread starter jenil_nz
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  • #1
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Main Question or Discussion Point

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
 
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Answers and Replies

  • #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.)
 
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  • #3
AFAIK it is at the peak amount of citric acid in the fruit when the fruit is @ its ripest.
 
  • #4
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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
 
  • #5
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hi ,wats the molecular formula of citric acid is it H3C6H5O7 or C6H8O7
 
  • #6
jenil_nz said:
hi ,wats the molecular formula of citric acid is it H3C6H5O7 or C6H8O7
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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