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Gluconic acid

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Title: Gluconic acid  
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Subject: Aldonic acid, Pomegranate ellagitannin, SCOBY, E number, Acids in wine
Collection: Acids in Wine, Chelating Agents, Food Additives, Gluconates, Sugar Acids
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Gluconic acid

D-Gluconic acid
Skeletal formula of gluconic acid
Ball-and-stick model of gluconic acid
Names
IUPAC name
D-Gluconic acid
Other names
Dextronic acid
Identifiers
 Y
(racemate) N
ChEBI  Y
ChEMBL  Y
ChemSpider  Y
EC number 208-401-4
Jmol-3D images Image
PubChem
Properties
C6H12O7
Molar mass 196.16 g/mol
Appearance Colorless crystals
Melting point 131 °C (268 °F; 404 K)
Good
Acidity (pKa) 3.86[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 N  (: Y/N?)

Gluconic acid is an molecular formula C6H12O7 and condensed structural formula HOCH2(CHOH)4COOH. It is one of the 16 stereoisomers of 2,3,4,5,6-pentahydroxyhexanoic acid.

In aqueous solution at neutral pH, gluconic acid forms the gluconate ion. The salts of gluconic acid are known as "gluconates". Gluconic acid, gluconate salts, and gluconate esters occur widely in nature because such species arise from the oxidation of glucose. Some drugs are injected in the form of gluconates.

Contents

  • Chemical structure 1
  • Occurrence and uses 2
  • References 3
  • External links 4

Chemical structure

The chemical structure of gluconic acid consists of a six-carbon chain with five hydroxyl groups terminating in a carboxylic acid group. In aqueous solution, gluconic acid exists in equilibrium with the cyclic ester glucono delta-lactone.

Occurrence and uses

Gluconic acid occurs naturally in fruit, honey, and wine. As a food additive (E574[2]), it is an acidity regulator. It is also used in cleaning products where it dissolves mineral deposits especially in alkaline solution. The gluconate anion chelates Ca2+, Fe2+, Al3+, and other metals. In 1929 Horace Terhune Herrick developed a process for producing the salt by fermentation.[3]

Calcium gluconate, in the form of a gel, is used to treat burns from hydrofluoric acid;[4][5] calcium gluconate injections may be used for more severe cases to avoid necrosis of deep tissues.[6] Quinine gluconate is a salt between gluconic acid and quinine, which is used for intramuscular injection in the treatment of malaria. Zinc gluconate injections are used to neuter male dogs.[7] Iron gluconate injections have been proposed in the past to treat anemia.[8]

References

  1. ^ Bjerrum, J., et al. Stability Constants, Chemical Society, London, 1958.
  2. ^ Current EU approved additives and their E Numbers. Food Standards Agency
  3. ^ "All Chemistry".  
  4. ^ el Saadi MS, Hall AH, Hall PK, Riggs BS, Augenstein WL, Rumack BH (1989). "Hydrofluoric acid dermal exposure". Vet Hum Toxicol 31 (3): 243–7.  
  5. ^ Roblin I, Urban M, Flicoteau D, Martin C, Pradeau D (2006). "Topical treatment of experimental hydrofluoric acid skin burns by 2.5% calcium gluconate". J Burn Care Res 27 (6): 889–94.  
  6. ^ D. Thomas, U. Jaeger, I. Sagoschen, C. Lamberti and K. Wilhelm (2009), Intra-Arterial Calcium Gluconate Treatment After Hydrofluoric Acid Burn of the Hand. CardioVascular and Interventional Radiology, Volume 32, Number 1, pages 155-158, doi:10.1007/s00270-008-9361-1
  7. ^ Julie K. Levy, P. Cynda Crawford, Leslie D. Appel, Emma L. Clifford (2008), Comparison of intratesticular injection of zinc gluconate versus surgical castration to sterilize male dogs. American Journal of Veterinary Research Vol. 69, No. 1, Pages 140-143. doi:10.2460/ajvr.69.1.140
  8. ^ Paul Reznikoff and Walther F. Goebel (1937), The preparation of ferrous gluconate and its use in the treatment of hypochromic anelia in rats. Journal of Pharmacology and Experimental Thereapy, volume 59 issue 2, page 182.

External links

  • Gluconic acid on NIST.gov
  • ChemSub Online: D-Gluconic acid.
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