Citric Acid
C₆H₈O₇·192.123 g/mol·Organic·CID 311
Food ChemistryCommon
A tricarboxylic acid central to the citric acid cycle (Krebs cycle) in metabolism. Gives citrus fruits their sour taste. Widely used as a food preservative, flavoring agent, and chelating agent.
IUPAC: 2-hydroxypropane-1,2,3-tricarboxylic acid
Also known as: 77-92-9, 2-hydroxypropane-1,2,3-tricarboxylic acid, Citric acid, anhydrous, Aciletten, Anhydrous citric acid (+14 more)
Molecular Structure
Molecular Propertiesmass · H-bonds · stereo
Molecular Weight
192.120g/mol
Exact Mass
192.027003Da
Monoisotopic Mass
192.027003Da
XLogP
-1.7
Polar Surface Area
132.0Ų
Complexity
227
Formal Charge
0
H-Bond Donors
4
H-Bond Acceptors
7
Rotatable Bonds
5
Heavy Atoms
13
Stereo Centers
0
Bond Stereo
0
Drug-Likeness (Lipinski's Rule of Five)
✓ 192.1 g/mol
MW ≤ 500
✓ -1.7
LogP ≤ 5
✓ 4
H-bond donors ≤ 5
✓ 7
H-bond acceptors ≤ 10
Passes all rules — good oral bioavailability predicted
GHS Hazard Classification
Warning
Hazards
H319Causes serious eye irritationH335May cause respiratory irritationH315Causes skin irritation
Source: PubChem GHS Classification. Always consult the SDS for handling.
Chemical IdentifiersSMILES · InChI
InChI
InChI=1S/C6H8O7/c7-3(8)1-6(13,5(11)12)2-4(9)10/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12)
Constituent Elements
Isomers8 compounds with formula C₆H₈O₇
1-hydroxypropane-1,2,3-tricarboxylic acid
CID 1198 · 192.1 g/mol
(1R,2S)-1-hydroxypropane-1,2,3-tricarboxylic acid
CID 5318532 · 192.1 g/mol
hydron;2-hydroxypropane-1,2,3-tricarboxylate
CID 19782904 · 192.1 g/mol
(2S)-2-[(2S,3R,4R)-3,4-dihydroxy-5-oxooxolan-2-yl]-2-hydroxyacetic acid
CID 122306 · 192.1 g/mol
2-(carboxymethyl)-2-hydroxybutanedioate;hydron
CID 88113319 · 192.1 g/mol
(2S,3S,4S,5R)-3,4,5-trihydroxy-6-oxooxane-2-carboxylic acid
CID 46926211 · 192.1 g/mol
(3S,4S)-3,4,6-trihydroxy-2,5-dioxohexanoic acid
CID 102287 · 192.1 g/mol
(2R,3S)-2,3-dihydroxy-5-oxohexanedioic acid
CID 439290 · 192.1 g/mol