Record Information |
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Version | 5.0 |
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Status | Detected but not Quantified |
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Creation Date | 2012-05-18 14:35:56 UTC |
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Update Date | 2023-02-21 17:18:03 UTC |
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HMDB ID | HMDB0013785 |
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Secondary Accession Numbers | |
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Metabolite Identification |
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Common Name | Furan |
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Description | Furan is a member of the class of compounds known as furans. These are molecules containing a heterocyclic organic group consisting of a five-membered aromatic ring with four carbon atoms and one oxygen. Furan is aromatic because one of the lone pairs of electrons on the oxygen atom is delocalized into the ring, creating a 4n+2 aromatic system similar to benzene. Because of the aromaticity, furan is flat and lacks discrete double bonds. Furan is a colourless, flammable, highly volatile liquid with a boiling point close to room temperature (31 °C). It is soluble in common organic solvents, including alcohol, ether, and acetone, but is insoluble in water. It has a strong ethereal odour. Furan is found in heat-treated (e.g. cooked, roasted, baked, pasteurized, and sterilized) commercial foods and is produced through thermal degradation of natural food constituents (PMID:22641279 ). It can be found in roasted coffee, instant coffee, and processed baby foods (PMID:22641279 ). In particular, the highest furan levels can be detected in coffee, with mean values between 42 and 3 660 ng/g for brewed coffee and roasted coffee beans. Furan can also be detected at levels between 0.2 and 3.2 ng/g in infant formula, from 22 to 24 ng/g in baked beans, from 13 to 17 ng/g in meat products, and from 23 to 24 ng/g in soups. In soy sauce, furan is detectable at 27 ng/g (PMID:26483883 ). Research has indicated that coffee made in espresso makers and, above all, coffee made from capsules, contains more furan than that made in traditional drip coffee makers, although the levels are still within safe health limits. Various pathways have been reported for the formation of furan: (1) thermal degradation and/or thermal rearrangement of carbohydrates in the presence of amino acids, (2) thermal degradation of certain amino acids (aspartic acid, threonine, alpha-alanine, serine, and cysteine), (3) oxidation of ascorbic acid at higher temperatures, and (4) oxidation of polyunsaturated fatty acids and carotenoids (PMID:26483883 ). Several studies have reported that furan formation occurs to a large extent during the Maillard reaction. The Maillard reaction involves the thermal degradation and rearrangement of carbohydrates (i.e. non-enzymatic browning reactions during food processing and cooking). Reducing hexoses often go through the Maillard reaction in the presence of amino acids and produce reactive intermediates such as 1-deoxy- and 3-deoxyosones, aldotetrose, and 2-deoxy-3-keto-aldotetrose. 2-Deoxy-3-keto-aldotetrose typically goes through retro-aldol cleavage leading to 3-deoxyosone which undergoes alpha-dicarbonyl cleavage, followed by oxidation and decarboxylation to form 2-deoxyaldotetrose, which is a direct precursor of furan. In addition to the formation of furan via carbohydrate degradation, furan can also be formed through thermal degradation of certain amino acids. Specifically, the amino acids that can form acetaldehyde and glycolaldehyde can produce furan by aldol condensation and cyclization (PMID:26483883 ). Furan is toxic and may be carcinogenic. In particular, furan is a potent hepatotoxin and hepatocarcinogen in rodents, causing hepatocellular adenomas and carcinomas in rats and mice, and high incidences of cholangiocarcinomas in rats at doses ≥ 2 mg/kg (PMID:22641279 ). |
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Structure | InChI=1S/C4H4O/c1-2-4-5-3-1/h1-4H |
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Synonyms | Value | Source |
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1,4-Epoxy-1,3-butadiene | ChEBI | Divinylene oxide | ChEBI | Furane | ChEBI | Oxacyclopentadiene | ChEBI | Oxole | ChEBI | Tetrole | ChEBI | Furfuran | HMDB | Furfurane | HMDB |
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Chemical Formula | C4H4O |
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Average Molecular Weight | 68.074 |
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Monoisotopic Molecular Weight | 68.02621475 |
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IUPAC Name | furan |
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Traditional Name | furan |
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CAS Registry Number | 110-00-9 |
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SMILES | O1C=CC=C1 |
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InChI Identifier | InChI=1S/C4H4O/c1-2-4-5-3-1/h1-4H |
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InChI Key | YLQBMQCUIZJEEH-UHFFFAOYSA-N |
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Chemical Taxonomy |
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Description | Belongs to the class of organic compounds known as heteroaromatic compounds. Heteroaromatic compounds are compounds containing an aromatic ring where a carbon atom is linked to an hetero atom. |
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Kingdom | Organic compounds |
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Super Class | Organoheterocyclic compounds |
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Class | Heteroaromatic compounds |
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Sub Class | Not Available |
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Direct Parent | Heteroaromatic compounds |
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Alternative Parents | |
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Substituents | - Heteroaromatic compound
- Furan
- Oxacycle
- Organic oxygen compound
- Hydrocarbon derivative
- Organooxygen compound
- Aromatic heteromonocyclic compound
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Molecular Framework | Aromatic heteromonocyclic compounds |
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External Descriptors | |
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Ontology |
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Physiological effect | Not Available |
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Disposition | |
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Process | Not Available |
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Role | |
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Physical Properties |
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State | Liquid |
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Experimental Molecular Properties | |
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Experimental Chromatographic Properties | Not Available |
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Predicted Molecular Properties | |
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Predicted Chromatographic Properties | Predicted Collision Cross SectionsPredicted Kovats Retention IndicesUnderivatized |
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Spectra |
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| GC-MS SpectraSpectrum Type | Description | Splash Key | Deposition Date | Source | View |
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Experimental GC-MS | GC-MS Spectrum - Furan EI-B (Non-derivatized) | splash10-00kr-9000000000-4c50652f33a401ab3cae | 2017-09-12 | HMDB team, MONA, MassBank | View Spectrum | Experimental GC-MS | GC-MS Spectrum - Furan EI-B (Non-derivatized) | splash10-00kr-9000000000-d007e0256578ac930b22 | 2017-09-12 | HMDB team, MONA, MassBank | View Spectrum | Experimental GC-MS | GC-MS Spectrum - Furan EI-B (Non-derivatized) | splash10-00kr-9000000000-4c50652f33a401ab3cae | 2018-05-18 | HMDB team, MONA, MassBank | View Spectrum | Experimental GC-MS | GC-MS Spectrum - Furan EI-B (Non-derivatized) | splash10-00kr-9000000000-d007e0256578ac930b22 | 2018-05-18 | HMDB team, MONA, MassBank | View Spectrum | Predicted GC-MS | Predicted GC-MS Spectrum - Furan GC-MS (Non-derivatized) - 70eV, Positive | Not Available | 2021-10-12 | Wishart Lab | View Spectrum | MS | Mass Spectrum (Electron Ionization) | splash10-00kr-9000000000-3bddc12b5a8dd3ca188d | 2014-09-20 | Not Available | View Spectrum |
MS/MS SpectraSpectrum Type | Description | Splash Key | Deposition Date | Source | View |
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Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 10V, Positive-QTOF | splash10-014i-9000000000-511af11e910184693aa1 | 2016-08-03 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 20V, Positive-QTOF | splash10-014i-9000000000-fd05695071ee559e9be4 | 2016-08-03 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 40V, Positive-QTOF | splash10-014i-9000000000-208e5dd03db999e390ff | 2016-08-03 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 10V, Negative-QTOF | splash10-014i-9000000000-351aa9d338efe69d31ef | 2016-08-03 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 20V, Negative-QTOF | splash10-014i-9000000000-acebecda0e70274875b1 | 2016-08-03 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 40V, Negative-QTOF | splash10-014i-9000000000-1df91dbb0164452d0fd1 | 2016-08-03 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 10V, Positive-QTOF | splash10-014u-9000000000-41895048238024d76bc7 | 2021-09-22 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 20V, Positive-QTOF | splash10-00ku-9000000000-a223589b20bc67c79fe0 | 2021-09-22 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 40V, Positive-QTOF | splash10-0udr-9000000000-056962459138c52c54c8 | 2021-09-22 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 10V, Negative-QTOF | splash10-00kf-9000000000-983ab9ff6334b0b9a584 | 2021-09-22 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 20V, Negative-QTOF | splash10-00ke-9000000000-77469f3e4a080d7d3681 | 2021-09-22 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - Furan 40V, Negative-QTOF | splash10-00kg-9000000000-d4fe1a89a559171ed26a | 2021-09-22 | Wishart Lab | View Spectrum |
NMR SpectraSpectrum Type | Description | Deposition Date | Source | View |
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Predicted 1D NMR | 1H NMR Spectrum (1D, 100 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 100 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 1000 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 1000 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 200 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 200 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 300 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 300 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 400 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 400 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 500 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 500 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 600 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 600 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 700 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 700 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 800 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 800 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 900 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 900 MHz, D2O, predicted) | 2021-09-25 | Wishart Lab | View Spectrum |
IR SpectraSpectrum Type | Description | Deposition Date | Source | View |
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Predicted IR Spectrum | IR Ion Spectrum (Predicted IRIS Spectrum, Adduct: [M+H]+) | 2023-02-03 | FELIX lab | View Spectrum | Predicted IR Spectrum | IR Ion Spectrum (Predicted IRIS Spectrum, Adduct: [M+Na]+) | 2023-02-03 | FELIX lab | View Spectrum |
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Biological Properties |
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Cellular Locations | Not Available |
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Biospecimen Locations | |
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Tissue Locations | Not Available |
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Pathways | |
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Normal Concentrations |
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Blood | Expected but not Quantified | Not Quantified | Not Available | Not Available | Normal | | details | Feces | Detected but not Quantified | Not Quantified | Adult (>18 years old) | Both | Normal | | details | Feces | Detected but not Quantified | Not Quantified | Adult (>18 years old) | Both | Normal | | details | Urine | Detected but not Quantified | Not Quantified | Adult (>18 years old) | Both | Normal | | details |
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Abnormal Concentrations |
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Feces | Detected but not Quantified | Not Quantified | Adult (>18 years old) | Both | Immunoglobulin A nephropathy (IgAN) non progressor | | details | Feces | Detected but not Quantified | Not Quantified | Adult (>18 years old) | Both | Immunoglobulin A nephropathy (IgAN) progressor | | details | Feces | Detected but not Quantified | Not Quantified | Adult (>18 years old) | Both | Ulcerative colitis | | details | Feces | Detected but not Quantified | Not Quantified | Adult (>18 years old) | Both | Crohn's disease | | details | Urine | Detected but not Quantified | Not Quantified | Adult (>18 years old) | Both | Breast cancer | | details |
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Associated Disorders and Diseases |
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Disease References | Ulcerative colitis |
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- De Preter V, Machiels K, Joossens M, Arijs I, Matthys C, Vermeire S, Rutgeerts P, Verbeke K: Faecal metabolite profiling identifies medium-chain fatty acids as discriminating compounds in IBD. Gut. 2015 Mar;64(3):447-58. doi: 10.1136/gutjnl-2013-306423. Epub 2014 May 8. [PubMed:24811995 ]
| Crohn's disease |
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- De Preter V, Machiels K, Joossens M, Arijs I, Matthys C, Vermeire S, Rutgeerts P, Verbeke K: Faecal metabolite profiling identifies medium-chain fatty acids as discriminating compounds in IBD. Gut. 2015 Mar;64(3):447-58. doi: 10.1136/gutjnl-2013-306423. Epub 2014 May 8. [PubMed:24811995 ]
| Perillyl alcohol administration for cancer treatment |
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- Silva CL, Passos M, Camara JS: Solid phase microextraction, mass spectrometry and metabolomic approaches for detection of potential urinary cancer biomarkers--a powerful strategy for breast cancer diagnosis. Talanta. 2012 Jan 30;89:360-8. doi: 10.1016/j.talanta.2011.12.041. Epub 2011 Dec 22. [PubMed:22284503 ]
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Associated OMIM IDs | |
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External Links |
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DrugBank ID | Not Available |
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Phenol Explorer Compound ID | Not Available |
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FooDB ID | Not Available |
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KNApSAcK ID | C00000095 |
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Chemspider ID | 7738 |
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KEGG Compound ID | C14275 |
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BioCyc ID | Not Available |
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BiGG ID | Not Available |
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Wikipedia Link | Furan |
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METLIN ID | Not Available |
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PubChem Compound | 8029 |
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PDB ID | Not Available |
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ChEBI ID | 35559 |
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Food Biomarker Ontology | Not Available |
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VMH ID | Not Available |
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MarkerDB ID | Not Available |
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Good Scents ID | rw1044201 |
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References |
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Synthesis Reference | Not Available |
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Material Safety Data Sheet (MSDS) | Download (PDF) |
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General References | - Moro S, Chipman JK, Wegener JW, Hamberger C, Dekant W, Mally A: Furan in heat-treated foods: formation, exposure, toxicity, and aspects of risk assessment. Mol Nutr Food Res. 2012 Aug;56(8):1197-211. doi: 10.1002/mnfr.201200093. Epub 2012 May 29. [PubMed:22641279 ]
- Seok YJ, Her JY, Kim YG, Kim MY, Jeong SY, Kim MK, Lee JY, Kim CI, Yoon HJ, Lee KG: [Not Available]. Toxicol Res. 2015 Sep;31(3):241-53. doi: 10.5487/TR.2015.31.3.241. [PubMed:26483883 ]
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