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Also known as: Caproaldehyde, 66-25-1, Hexaldehyde, Caproic aldehyde, 1-hexanal, Capronaldehyde
Molecular Formula
C6H12O
Molecular Weight
100.16  g/mol
InChI Key
JARKCYVAAOWBJS-UHFFFAOYSA-N
FDA UNII
9DC2K31JJQ

CAS 66-25-1
N-Hexanal is a metabolite found in or produced by Saccharomyces cerevisiae.
1 2D Structure

CAS 66-25-1

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
hexanal
2.1.2 InChI
InChI=1S/C6H12O/c1-2-3-4-5-6-7/h6H,2-5H2,1H3
2.1.3 InChI Key
JARKCYVAAOWBJS-UHFFFAOYSA-N
2.1.4 Canonical SMILES
CCCCCC=O
2.2 Other Identifiers
2.2.1 UNII
9DC2K31JJQ
2.3 Synonyms
2.3.1 MeSH Synonyms

1. (e)-2-hexanal

2. (z)-hex-3-enal

3. Caproic Aldehyde

4. Capronaldehyde

5. E-2-hexanal

6. Hexanaldehyde

7. N-hexanal

2.3.2 Depositor-Supplied Synonyms

1. Caproaldehyde

2. 66-25-1

3. Hexaldehyde

4. Caproic Aldehyde

5. 1-hexanal

6. Capronaldehyde

7. N-hexanal

8. Hexanaldehyde

9. N-caproaldehyde

10. Hexylaldehyde

11. Aldehyde C-6

12. N-capronaldehyde

13. Hexyl Aldehyde

14. N-caproylaldehyde

15. Hexoic Aldehyde

16. N-hexaldehyde

17. C6 Aldehyde

18. N-caproic Aldehyde

19. Kapronaldehyd

20. N-hexylaldehyde

21. Fema No. 2557

22. Nsc 2596

23. Hexan-1-al

24. N-c5h11cho

25. 9dc2k31jjq

26. Chembl280331

27. Chebi:88528

28. Nsc-2596

29. Dsstox_cid_1604

30. Dsstox_rid_76231

31. Dsstox_gsid_21604

32. Hexanal (natural)

33. Kapronaldehyd [czech]

34. Fema Number 2557

35. Aldehyde C6

36. Cas-66-25-1

37. Ccris 3219

38. Hsdb 560

39. Einecs 200-624-5

40. Un1207

41. Unii-9dc2k31jjq

42. Brn 0506198

43. Capronaidehyde

44. Ai3-15364

45. 1-hexanone

46. Aldehydes, C6

47. Mfcd00007027

48. Hexanal, 98%

49. Hexanal [fhfi]

50. Hexanal [inci]

51. Hexanal [fcc]

52. Hexaldehyde [hsdb]

53. Ec 200-624-5

54. Wln: Vh5

55. Hexanal, Analytical Standard

56. Schembl22263

57. 4-01-00-03296 (beilstein Handbook Reference)

58. Caproic Aldehyde [mi]

59. Dtxsid2021604

60. Nsc2596

61. Hexanal, Natural, >=90%, Fg

62. Hexanal, Natural, >=95%, Fg

63. Hexanal, >=97%, Fcc, Fg

64. Zinc1641021

65. Tox21_201933

66. Tox21_303342

67. Bdbm50028824

68. Lmfa06000109

69. Stl280331

70. Akos009156478

71. Fs-3948

72. Hexanal 100 Microg/ml In Acetonitrile

73. Un 1207

74. Ncgc00249137-01

75. Ncgc00257270-01

76. Ncgc00259482-01

77. Bp-31180

78. Db-054893

79. Ft-0631290

80. Ft-0669191

81. H0133

82. Hexaldehyde [un1207] [flammable Liquid]

83. En300-33498

84. A835388

85. Q420698

86. J-660017

87. 861259-78-1

88. O8y

2.4 Create Date
2005-03-26
3 Chemical and Physical Properties
Molecular Weight 100.16 g/mol
Molecular Formula C6H12O
XLogP31.8
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count1
Rotatable Bond Count4
Exact Mass100.088815002 g/mol
Monoisotopic Mass100.088815002 g/mol
Topological Polar Surface Area17.1 Ų
Heavy Atom Count7
Formal Charge0
Complexity41.4
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Pharmacology and Biochemistry
4.1 MeSH Pharmacological Classification

Antifungal Agents

Substances that destroy fungi by suppressing their ability to grow or reproduce. They differ from FUNGICIDES, INDUSTRIAL because they defend against fungi present in human or animal tissues. (See all compounds classified as Antifungal Agents.)


Insecticides

Pesticides designed to control insects that are harmful to man. The insects may be directly harmful, as those acting as disease vectors, or indirectly harmful, as destroyers of crops, food products, or textile fabrics. (See all compounds classified as Insecticides.)


4.2 Metabolism/Metabolites

Aldehyde dehydrogenase specific activity was measured in crude homogenates, post-mitochondrial supernatants, cytosolic and microsomal fractions of trout live, using a number of endogenous and xenobiotic aldehydes and both NAD+ and NADP+ as co-factors. All the activity found in the crude homogenate could be accounted for by the sum of the cytosolic and microsomal activities. Highest activities were found with the medium chain length substrates hexanal and nonanal in all fractions. Apparent affinity for hexanal and nonanal in the cytosolic fraction were comparable to that found in rats, but the theoretical maximal velocity for these substrates, and the specific activities for the other substrates, were much lower than found in mammals. In another study with carcinogen fed fish, aldehyde dehydrogenase distribution was evaluated histochemically in cryostat sections. In control trout, aldehyde dehydrogenase was uniformly distributed without an apparent zonal pattern. However, in hepatic tumors, aldehyde dehydrogenase was apparently induced with hexanal, nonanal, and propionaldehyde giving the strongest reaction products.

Parker LM et al; Acuat Toxicol (AMST) 18 (1): 1-12 (1990)


the substrate preference of an aldehyde dehydrogenase induced in rat liver cytosol by 3-methylcholanthrene was examined. This enzyme, T-ALDH, is identical to the aldehyde dehydrogenase inducible in rat liver by 2,3,7,8-tetrachloro-dibenzo-p-dioxin and the tumor associated aldehyde dehydrogenase found in rat hepatocellular neoplasms. With either NAD or NADP as coenzyme, the preferred substrates were the aliphatic aldehydes n-hexanal, n-nonanal, and isobutyraldehyde and the aromatic aldehydes 2,5-dihydroxybenzaldehyde, benzaldehyde, and 3-hydroxybenzaldehyde. T-ALDH may play a role in oxidizing a variety of aldehydes produced in physiological lipid metabolism. On the contrary, this isozyme does not seem to participate in the oxidation of small aliphatic aldehydes generated during lipid peroxidation.

PMID:3420620 Marselos M, Lindahl R; Toxicol Appl Pharmacol 95 (2): 339-45 (1988)


Alcohol dehydrogenase classes exhibit differences in both substrate specificity and tissue distribution which suggest distinct physiological functions. The kinetic constants of the rat alcohol dehydrogenase classes, purified from liver (classes I and III) and from stomach (class IV), with three groups of relevant physiological compounds: cytotoxic aldehydes generated in lipid peroxidation, omega-hydroxy fatty acids, and retinoids /have been studied/. Classes I and IV actively reduce 4-hydroxynonenal, 2-hexenal, and hexanal, which are toxic compounds known to be produced in significant amounts during lipid peroxidation. Class III shows poor activity with these aldehydes. Class IV exhibits the best kcat/Km values (2150 mM-1 X min-1 for 4-hydroxynonenal), which suggest a role for this enzyme in the elimination of the cytotoxic aldehydes in tissues that are susceptible to lipid peroxidation, such as skin, cornea, and mucosa of the respiratory and digestive tracts, where class IV is localized.

PMID:8239669 Boleda MD et al; Arch Biochem Biophys 307 (1): 85-90 (1993)


Similar to saturated aldehydes, hexanal is oxidized to the corresponding caboxylic acid by aldehyde dehydrogenase mainly in the liver, but also in other tissues and cells. The acid can serve as a substrate for the Krebs cycle or is excreted as a salt. Alternatively, it can conjugate with glutathione or the sulfhydryl group of other proteins.

Bingham, E.; Cohrssen, B.; Powell, C.H.; Patty's Toxicology Volumes 1-9 5th ed. John Wiley & Sons. New York, N.Y. (2001)., p. V5:991


Free radical induced lipid peroxidation may play a role in neurodegeneration and peroxidation leads to the formation of hexanal from omega-6 fatty acids. We have previously demonstrated in vitro that pyruvate dehydrogenase (PDH) catalyzes the condensation of saturated aldehydes with pyruvate to form acyloins. We have further shown in perfused rat heart that hexanal, presumably via PDH, is converted to 3-hydroxyoctan-2-one and that it in turn can be reduced to 2,3-octanediol. We now extend this work using intra-striatal microdialysis to show that this reaction also occurs in rat brain. The reduction of hexanal to hexanol was also evaluated. Microdialysis probes were implanted bilaterally in the striatum and were infused with hexanal with and in the absence of added pyruvate. Analysis of microdialysis samples showed a release of 3-hydroxyoctan-2-one (9.5-10.5 pmol/min), 2,3-octanediol (2.2-2.7 pmol/min) and hexanol (64-74 pmol/min). Pyruvate addition did not increase 3-hydroxyoctan-2-one or 2,3-octanediol production. In a second series of experiments where no exogenous hexanal was infused, endogenous production of 3-hydroxyoctan-2-one (1.0-1.3 pmol/min) and 2,3-octanediol (1.0-1.2 pmol/min) was still observed, although no hexanol was detected. We also investigated the possibility that oxidative stress induced by 1-methyl-4-phenylpyridinium (MPP+) would increase lipid peroxidation resulting in increased production of 3-hydroxyoctan-2-one. Analysis of samples collected following MPP+ infusion indicated no additional increase suggesting that brief exposure to MPP+ does not increase hexanal formation over baseline levels during the experimental period.

PMID:10488909 Jaar V et al; Metab Brain Dis 14 (2): 71-82 (1999)


4.3 Mechanism of Action

Inhibition of intercellular communication is an important feature in the tumor promotion phase of a multistage carcinogenesis model. In atherosclerosis inhibition of cell-cell communication by atherogenic compounds, e.g., low density lipoproteins (LDL), also seems to be important. For testing atherogenic compounds we used an atherosclerosis relevant cell type, namely human smooth muscle cells. In order to investigate which part of the LDL particle would be involved in inhibition of metabolic co-operation between human smooth muscle cells in culture ... several fatty acids and their breakdown products /were tested/, namely aldehydes. Unsaturated C-18 fatty acids markedly influenced gap-junctional intercellular communication (GJIC), whereas saturated (C18:0, C16:0) and unsaturated fatty acids with > 20 carbon atoms did not inhibit GJIC. In the case of oleic and elaidic acid, orientation seemed important; however, after exposure to palmitoleic and palmitelaidic acid no differences were found. The most potent inhibitor of GJIC was linoleic acid, which inhibited GJIC by 75%. No correlation was found between degrees of unsaturation and ability to inhibit GJIC. Of the tested aldehydes, hexanal, propanal, butanal and 4-hydroxynonenal did significantly inhibit GJIC, while pentanal had no effect. Since modification of LDL was shown to be important in order for LDL to inhibit GJIC, these results show that fatty acids and their oxidative breakdown products may be of importance for the inhibition of GJIC by LDL.

PMID:8313516 de Haan LH et al; Carcinogenesis 15 (2): 253-6 (1994)


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