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Record Information
Version3.6
Creation Date2006-05-22 14:17:42 UTC
Update Date2016-02-11 01:05:27 UTC
HMDB IDHMDB02209
Secondary Accession NumbersNone
Metabolite Identification
Common NameEquol
DescriptionEquol is a metabolite of daidzein, a phytoestrogen common in the human diet and abundant in soy. Intestinal bacteria in humans can reduce daidzein to equol, and can be found in normal human urine. The clinical effectiveness of soy isoflavones may be a function of the ability to biotransform soy isoflavones to the more potent estrogenic metabolite, equol, which may enhance the actions of soy isoflavones, owing to its greater affinity for estrogen receptors, unique antiandrogenic properties, and superior antioxidant activity. However, not all individuals consuming daidzein produce equol. Only approximately one-third to one-half of the population is able to metabolize daidzein to equol. This high variability in equol production is presumably attributable to interindividual differences in the composition of the intestinal microflora, which may play an important role in the mechanisms of action of isoflavones. (PMID: 17579895 , 17579894 ).
Structure
Thumb
Synonyms
ValueSource
(S)-EquolChEMBL
(-)-(S)-EquolHMDB
(-)-EquolHMDB
(S)-(-)-4',7-IsoflavandiolHMDB
(S)-3,4-dihydro-3-(4-Hydroxyphenyl)-2H-1-benzopyran-7-olHMDB
4',7-DihydroxyisoflavanHMDB
4',7-IsoflavandiolHMDB
Chemical FormulaC15H14O3
Average Molecular Weight242.2699
Monoisotopic Molecular Weight242.094294314
IUPAC Name(3S)-3-(4-hydroxyphenyl)-3,4-dihydro-2H-1-benzopyran-7-ol
Traditional Name(-)-equol
CAS Registry Number531-95-3
SMILES
OC1=CC=C(C=C1)[C@H]1COC2=C(C1)C=CC(O)=C2
InChI Identifier
InChI=1S/C15H14O3/c16-13-4-1-10(2-5-13)12-7-11-3-6-14(17)8-15(11)18-9-12/h1-6,8,12,16-17H,7,9H2/t12-/m1/s1
InChI KeyInChIKey=ADFCQWZHKCXPAJ-GFCCVEGCSA-N
Chemical Taxonomy
DescriptionThis compound belongs to the class of organic compounds known as isoflavanols. These are polycyclic compounds containing a hydroxylated isoflavan skeleton.
KingdomOrganic compounds
Super ClassPhenylpropanoids and polyketides
ClassIsoflavonoids
Sub ClassIsoflavans
Direct ParentIsoflavanols
Alternative Parents
Substituents
  • Hydroxyisoflavonoid
  • Isoflavanol
  • 1-benzopyran
  • Benzopyran
  • Chromane
  • Phenol
  • Alkyl aryl ether
  • Benzenoid
  • Monocyclic benzene moiety
  • Oxacycle
  • Organoheterocyclic compound
  • Ether
  • Hydrocarbon derivative
  • Organooxygen compound
  • Aromatic heteropolycyclic compound
Molecular FrameworkAromatic heteropolycyclic compounds
External Descriptors
Ontology
StatusDetected and Quantified
Origin
  • Endogenous
BiofunctionNot Available
ApplicationNot Available
Cellular locations
  • Membrane (predicted from logP)
Physical Properties
StateSolid
Experimental Properties
PropertyValueReference
Melting Point189.5 °CNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
PropertyValueSource
Water Solubility0.044 mg/mLALOGPS
logP2.91ALOGPS
logP3.19ChemAxon
logS-3.7ALOGPS
pKa (Strongest Acidic)9.63ChemAxon
pKa (Strongest Basic)-4.9ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count3ChemAxon
Hydrogen Donor Count2ChemAxon
Polar Surface Area49.69 Å2ChemAxon
Rotatable Bond Count1ChemAxon
Refractivity68.96 m3·mol-1ChemAxon
Polarizability25.81 Å3ChemAxon
Number of Rings3ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectra
Spectra
Spectrum TypeDescriptionSplash Key
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, PositiveNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, NegativeNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, NegativeNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, NegativeNot Available
Biological Properties
Cellular Locations
  • Membrane (predicted from logP)
Biofluid Locations
  • Blood
  • Urine
Tissue LocationNot Available
PathwaysNot Available
Normal Concentrations
BiofluidStatusValueAgeSexConditionReferenceDetails
BloodDetected and Quantified0.0006 (0.00057 - 0.00066) uMAdult (>18 years old)MaleNormal details
BloodDetected and Quantified0.0006 (0.00057 - 0.0007) uMAdult (>18 years old)FemaleNormal details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableConsuming polyphenols described by Phenol-Explorer entry 866
  • Not Applicable
details
UrineDetected and Quantified0.06 (0.01-0.10) umol/mmol creatinineAdult (>18 years old)Both
Normal
details
UrineDetected and Quantified0.00327 (0.00275-0.00388) umol/mmol creatinineAdult (>18 years old)Not SpecifiedNormal
    • National Health a...
details
UrineDetected and Quantified0.00625 (0.00504-0.00775) umol/mmol creatinineChildren (1-13 years old)Not SpecifiedNormal
    • National Health a...
details
UrineDetected and Quantified0.13 +/- 0.12 (0.0061-0.623) umol/mmol creatinineAdult (>18 years old)BothNormal details
Abnormal Concentrations
BiofluidStatusValueAgeSexConditionReferenceDetails
UrineDetected and Quantified0 - 36.7 umol/mmol creatinineAdult (>18 years old)BothSoy consumption (ileostomies) details
Associated Disorders and Diseases
Disease References
Ileostomy
  1. Walsh KR, Haak SJ, Bohn T, Tian Q, Schwartz SJ, Failla ML: Isoflavonoid glucosides are deconjugated and absorbed in the small intestine of human subjects with ileostomies. Am J Clin Nutr. 2007 Apr;85(4):1050-6. [17413104 ]
Associated OMIM IDsNone
DrugBank IDNot Available
DrugBank Metabolite IDNot Available
Phenol Explorer Compound IDNot Available
Phenol Explorer Metabolite ID866
FoodDB IDFDB021824
KNApSAcK IDC00009707
Chemspider ID82594
KEGG Compound IDC14131
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkEquol
NuGOwiki LinkHMDB02209
Metagene LinkHMDB02209
METLIN IDNot Available
PubChem Compound91469
PDB IDNot Available
ChEBI ID428126
References
Synthesis ReferenceWang, Xiu-Ling; Hur, Hor-Gil; Lee, Je Hyeon; Kim, Ki Tae; Kim, Su-Il. Enantioselective synthesis of S-equol from dihydrodaidzein by a newly isolated anaerobic human intestinal bacterium. Applied and Environmental Microbiology (2005), 71(1), 214-219
Material Safety Data Sheet (MSDS)Download (PDF)
General References
  1. Yuan JP, Wang JH, Liu X: Metabolism of dietary soy isoflavones to equol by human intestinal microflora--implications for health. Mol Nutr Food Res. 2007 Jul;51(7):765-81. [17579894 ]
  2. Moors S, Blaszkewicz M, Bolt HM, Degen GH: Simultaneous determination of daidzein, equol, genistein and bisphenol A in human urine by a fast and simple method using SPE and GC-MS. Mol Nutr Food Res. 2007 Jul;51(7):787-98. [17579895 ]