Is citric acid found only in citrus fruits?

Question

I mean in natural sources.

Answer 1

no

Answer 2

Citric Acid

Citric acid is the acid found in citrus fruits

Only very small quantities of citric acid exist in grapes.

While small quantities of citric acid are also produced during fermentation, the presence of large quantities are due to winemaker additions.

Citric acid is often added for acidification as it is claimed to taste fruitier and is a cheaper alternative to tartaric acid.

Citric acid however, is not biologically stable and subject to microbial attack, especially by lactic acid bacteria (LAB), producing unpleasant flavour compounds.

Hence, citric acid should not be added until after malo-lactic fermentation (MLF) is completed and stabilised against microbial attack by additions of sulphur dioxide (SO2).

Citric acid is a triprotic acid and requires three molecules of NaOH to react with one molecule of citric acid

Expected levels of citric acid found in wine are 0.0-0.5 g/L.

Citric acid has an agreeable sour taste. It is soluble in 4ths of its weight of cold, and in half its weight of boiling water, and dissolves in alcohol, but not in ether. At 150° C. it melts, and on the continued application of heat boils, giving off its water of crystallization. At 175° C. it is resolved into water and aconitic acid, C 6 H 6 0 6, a substance found in Equisetum fluviatile, monkshood and other plants. A higher temperature decomposes this body into carbon dioxide and itaconic acid, C 5 H 6 0 4, which, again, by the expulsion of a molecule of water, yields citraconic anhydride, C 5 H 4 0 3. Citric acid digested at a temperature below 40° C. with concentrated sulphuric acid gives off carbon monoxide and forms acetone dicarboxylic acid. With fused potash it forms potassium oxalate and acetate. It is a strong acid, and dissolved in water decomposes carbonates and attacks iron and zinc.

The citrates are a numerous class of salts, the most soluble of which are those of the alkaline metals; the citrates of the alkaline earth metals are insoluble. Citric acid, being tribasic, forms either acid monometallic, acid dimetallic or neutral trimetallic salts; thus, mono-, diand tri-potassium and sodium citrates are known. On warming citric acid with an excess of lime-water a precipitate of calcium citrate is obtained which is redissolved as the liquid cools.

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Answer 3

No- its is found in substantial amounts in lemons and limes especially and other citrus.  It is a very common additive in soft drinks and is a common intermediate material in a cell's natural respiration (Krebs Cycle)