Record Information |
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Version | 2.0 |
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Created at | 2005-11-16 15:48:42 UTC |
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Updated at | 2021-07-01 14:27:20 UTC |
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NP-MRD ID | NP0001276 |
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Secondary Accession Numbers | None |
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Natural Product Identification |
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Common Name | Isocitric acid |
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Description | Isocitric acid, also known as isocitrate belongs to the class of organic compounds known as tricarboxylic acids and derivatives. These are carboxylic acids containing exactly three carboxyl groups. Isocitric acid is a TCA (tricarboxylic acid) cycle intermediate. It is a structural isomer of citric acid and is formed from citrate with the help of the enzyme aconitase. More specifically, Isocitric acid is synthesized from citric acid via the intermediate cis-aconitic acid by the enzyme aconitase (aconitate hydratase). Isocitrate is acted upon by isocitrate dehydrogenase (IDH) to form alpha-ketoglutarate. This is a two-step process, which involves oxidation of isocitrate to oxalosuccinate (a ketone), followed by the decarboxylation of the carboxyl group beta to the ketone, forming alpha-ketoglutarate. In humans, IDH exists in three isoforms: IDH3 catalyzes the third step of the citric acid cycle while converting NAD+ to NADH in the mitochondria. The isoforms IDH1 and IDH2 catalyze the same reaction outside the context of the citric acid cycle and use NADP+ as a cofactor instead of NAD+. They localize to the cytosol as well as the mitochondrion and peroxisome. Isocitric acid exists in all living species, ranging from bacteria to plants to humans. Isocitric acid is a minor organic acid found in most fruit juices, especially in blackberries, youngberries, and boyberries, and in vegetables, especially in carrots. The determination of D-isocitric acid has become of importance in the analysis of fruit juices for the detection of illegal additives (adulteration). Since the quantities of citric and isocitric acids are correlated in fruit juices, a high ratio of citric to isocitric acid can indicate the addition of citric acid as an alduterant. In authentic orange juice, for example, the ratio of citric acid to D-isocitric acid is usually less than 130. Isocitric acid is mostly used in the food industry (food additive) as a food acidulant. |
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Structure | OC(C(CC(O)=O)C(O)=O)C(O)=O InChI=1S/C6H8O7/c7-3(8)1-2(5(10)11)4(9)6(12)13/h2,4,9H,1H2,(H,7,8)(H,10,11)(H,12,13) |
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Synonyms | Value | Source |
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1-Hydroxypropane-1,2,3-tricarboxylic acid | ChEBI | 1-Hydroxytricarballylic acid | ChEBI | 1-Hydroxypropane-1,2,3-tricarboxylate | Generator | 1-Hydroxytricarballylate | Generator | Isocitrate | Generator | 1-Hydroxy-1,2,3-propanetricarboxylate | HMDB | 1-Hydroxy-1,2,3-propanetricarboxylic acid | HMDB | 3-Carboxy-2,3-dideoxy-1-hydroxypropan-1,2,3-tricarboxylate | HMDB | 3-Carboxy-2,3-dideoxy-1-hydroxypropan-1,2,3-tricarboxylic acid | HMDB | 3-Carboxy-2,3-dideoxy-pentarate | HMDB | 3-Carboxy-2,3-dideoxy-pentaric acid | HMDB | D-Isocitrate | HMDB | I-cit | HMDB | Threo-D(S)-iso-citrate | HMDB | Threo-DS-isocitrate | HMDB | Isocitric acid, sodium salt | HMDB | Isocitric acid, trisodium salt | HMDB | Isocitric acid, disodium salt | HMDB | Isocitric acid, (11)C-labeled | HMDB | Isocitric acid, calcium salt | HMDB | Isocitric acid, potassium salt | HMDB |
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Chemical Formula | C6H8O7 |
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Average Mass | 192.1235 Da |
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Monoisotopic Mass | 192.02700 Da |
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IUPAC Name | 1-hydroxypropane-1,2,3-tricarboxylic acid |
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Traditional Name | isocitric acid |
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CAS Registry Number | 320-77-4 |
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SMILES | OC(C(CC(O)=O)C(O)=O)C(O)=O |
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InChI Identifier | InChI=1S/C6H8O7/c7-3(8)1-2(5(10)11)4(9)6(12)13/h2,4,9H,1H2,(H,7,8)(H,10,11)(H,12,13) |
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InChI Key | ODBLHEXUDAPZAU-UHFFFAOYSA-N |
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Experimental Spectra |
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| Spectrum Type | Description | Depositor Email | Depositor Organization | Depositor | Deposition Date | View |
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1D NMR | 1H NMR Spectrum (1D, 500 MHz, H2O, experimental) | Wishart Lab | Wishart Lab | David Wishart | 2021-06-20 | View Spectrum | 2D NMR | [1H, 13C]-HSQC NMR Spectrum (2D, 600 MHz, H2O, experimental) | Wishart Lab | Wishart Lab | David Wishart | 2021-06-20 | View Spectrum |
| Predicted Spectra |
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| Not Available | Chemical Shift Submissions |
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| Not Available | Species |
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Species of Origin | |
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Species Where Detected | |
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Chemical Taxonomy |
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Description | Belongs to the class of organic compounds known as tricarboxylic acids and derivatives. These are carboxylic acids containing exactly three carboxyl groups. |
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Kingdom | Organic compounds |
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Super Class | Organic acids and derivatives |
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Class | Carboxylic acids and derivatives |
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Sub Class | Tricarboxylic acids and derivatives |
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Direct Parent | Tricarboxylic acids and derivatives |
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Alternative Parents | |
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Substituents | - Tricarboxylic acid or derivatives
- Beta-hydroxy acid
- Monosaccharide
- Hydroxy acid
- Alpha-hydroxy acid
- Secondary alcohol
- Carboxylic acid
- Organic oxygen compound
- Organic oxide
- Hydrocarbon derivative
- Organooxygen compound
- Carbonyl group
- Alcohol
- Aliphatic acyclic compound
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Molecular Framework | Aliphatic acyclic compounds |
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External Descriptors | |
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Physical Properties |
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State | Solid |
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Experimental Properties | Property | Value | Reference |
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Melting Point | 162 - 165 °C | Not Available | Boiling Point | Not Available | Not Available | Water Solubility | 466 mg/mL | Not Available | LogP | Not Available | Not Available |
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Predicted Properties | |
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General References | - Hoffmann GF, Meier-Augenstein W, Stockler S, Surtees R, Rating D, Nyhan WL: Physiology and pathophysiology of organic acids in cerebrospinal fluid. J Inherit Metab Dis. 1993;16(4):648-69. [PubMed:8412012 ]
- Stromme JH, Borud O, Moe PJ: Fatal lactic acidosis in a newborn attributable to a congenital defect of pyruvate dehydrogenase. Pediatr Res. 1976 Jan;10(1):62-6. [PubMed:813176 ]
- Sutor DJ, Percival JM, Doonan S: Isolation and identification of some urinary inhibitors of calcium phosphate formation. Clin Chim Acta. 1978 Oct 16;89(2):273-8. [PubMed:213213 ]
- Ebeling K, Ruckhaberle KE, Bilek K: [Studies on the recording of cytostatic effects on organ cultures of squamous cell carcinoma of the uterine cervix]. Zentralbl Gynakol. 1977;99(20):1249-59. [PubMed:595962 ]
- Sutor DJ, Percival JM, Doonan S: Urinary inhibitor of the formation of calcium oxalate. Br J Urol. 1979 Aug;51(4):253-5. [PubMed:223711 ]
- Hennequin C, Lalanne V, Daudon M, Lacour B, Drueke T: A new approach to studying inhibitors of calcium oxalate crystal growth. Urol Res. 1993 Mar;21(2):101-8. [PubMed:8389069 ]
- Kavanagh JP: Isocitric and citric acid in human prostatic and seminal fluid: implications for prostatic metabolism and secretion. Prostate. 1994;24(3):139-42. [PubMed:8115279 ]
- Mikosha AS, Monissarenko VP, Bychkovskaia LA: [Properties of adrenocortical isocitrate dehydrogenase]. Vopr Med Khim. 1981 Nov-Dec;27(6):736-9. [PubMed:7336646 ]
- Sutor DJ, Percival JM: The estimation of D-isocitric acid in urine using isocitrate dehydrogenase. Clin Chim Acta. 1978 Jun;86(2):223-5. [PubMed:657545 ]
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