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Table 2 Summary of the selected candidate BFIs of Allium vegetables and the excluded biomarkers and reasons for inclusion or exclusion

From: Biomarkers of food intake for Allium vegetables

Food item

Metabolites

Biofluid locations

Reason for inclusion or exclusion

Selected for the systematic validation as BFI

References

Garlic

ALMA

Urine

Specificity, suitable post-prandial kinetics, and dose-response

Yes

[19,20,21,22]

AMS

Breath

Specificity, suitable post-prandial kinetics, and dose-response

Yes

[18, 28,29,30,31]

AMS

Urine

Specificity, suitable post-prandial kinetics, and dose-response

Yes

[33]

AMS

Breast milk

Uncommon sampling

No

[34]

AMSO

Urine

Specificity, suitable post-prandial kinetics

Yes

[33]

AMSO2

Urine

Specificity, suitable post-prandial kinetics

Yes

[33]

SAC

Plasma

Probably specific, need for further investigation

Yes

[18]

DADS

Urine

Too low concentration, scarce information on kinetics

No

[27]

DADS

Breath

Too low concentration, too short half-life

No

[18, 29, 30, 32]

DAS

Urine

Too low concentration, scarce information on kinetics

No

[27]

DAS

Breath

Too low concentration, too short half-life

No

[18, 29, 30]

DMS

Breath

Too low concentration, too short half-life

No

[29]

DMDS

Breath

Unspecific, too low concentration

No

[30]

DMDS

Urine

Unspecific, too low concentration

No

[27, 33]

DMTS

Urine

Unspecific, too low concentration

No

[27]

Acetone

Breath

Unspecific, too variable background

No

[28, 29]

Organo-selenium compounds

Breath

Too low concentration

No

[30]

Methanethiol

Breath

Too low concentration, too short half-life

No

[31]

Allyl mercaptan

Breath

Too low concentration, too short half-life

No

[31, 32]

AMDS

Breath

Too low concentration, too short half-life

No

[29,30,31]

AMDS

Urine

Only detectable after the consumption of a high dose (30 g garlic)

No

[33]

ADS

Breath

Too low concentration, too short half-life

No

[31]

DATS

Breath

Too low concentration, too short half-life

No

[29, 30]

Hexahydrohippuric acid

Urine

Unspecific

No

[19]

2-propenethiol

Breath

Too low concentration, too short half-life

No

[30]

Onion

N-acetyl-S-(1Z)-propenyl-cysteine- sulfoxide

Urine

Probably specific, identification level II, need for further investigation

No

[48]

Quercetin

Plasma/urine

Unspecific

No

[40, 42, 43, 56,57,58,59,60,61]

Quercetin-3′-sulphate

Plasma/urine

Unspecific

No

[41]

Quercetin-3-glucuronide

Plasma/urine

Unspecific

No

[41]

Quercetin-4′-glucuronide

Plasma/urine

Unspecific

No

[47]

Quercetin diglucuronide

Plasma/urine

Unspecific

No

[41]

Isorhamnetin

Plasma/urine

Unspecific

No

[40, 43, 56, 59, 61]

Isorhamnetin-3-glucuronide

Plasma/urine

Unspecific

No

[41]

Isorhamnetin-4′-glucuronide

Plasma/urine

Unspecific

No

[47]

Tamarixetin

Plasma/urine

Unspecific

No

[59, 61]

Kaempferol

Plasma/urine

Unspecific

No

[56, 57]

Flavonol metabolites

Plasma/urine

Unspecific

No

[40, 43, 46]

Dimethyl sulfone

Urine*

Unspecific

No

[49]

3-hydroxyphenylacetic acid

Urine*

Unspecific

No

[49]

Onion and garlic

CPMA

Urine

Probably specific, needs further investigation

Yes

[19]

Shallot

Quercetin

Plasma

Unspecific

No

[54]

  1. Abbreviation: ALMA S-allylmercapturic acid, AMS allyl methyl sulfide, AMSO allyl methyl sulfoxide, AMSO2 allyl methyl sulfone, CPMA N-acetyl-S-(2-carboxypropyl)cysteine, SAC S-allylcysteine, DADS diallyl disulfide, DAS diallyl sulfide, DMDS dimethyl disulfide, AM allyl mercaptan, AMDS allyl methyl disulfide, ADS allyl disulfide, DATS diallyl trisulfide, DMS dimethyl sulfide, DMTS dimethyl trisulfide
  2. *Data from animal study