Dioscorea dumetorum 122 claims

species · family Dioscoreaceae · green plant · NCBI Taxonomy ↗

Common name: bitter yam — Also written in claims: bitter yam · trifoliate yam — NCBI synonyms: Helmia dumetorum

9 spellings

Dioscorea dumetorumMarco Schmidt · CC BY-SA 2.5 · Wikimedia Commons ↗

122 claims

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Observationobservedoriginal resultmeasured

Claim · model-written summary

Leaf oil yield was 0.50%.

Taxon: Dioscorea dumetorumDioscorea dumetorume1
Organ / stage: leafe0
Outcome: leaf and stem oils yieldede0
Value: 0.50%e0

Verbatim

e0
“The leaf and stem oils yielded 0.50% and 1.07%, respectively.”
✓ located verbatim in the source · abstract, characters 1272–1333

e1
“Dioscorea dumetorum (bitter yam)”
✓ located verbatim in the source · abstract, characters 12–44

Title

Chemical Composition, Antimicrobial and Antioxidant Activities of Dioscorea dumetorum (Bitter Yam) Leaves and Stem Essential Oil

Ganiyat K. Oloyede; Ayotomide O. Banjoko International Journal of Pharmacology 2026. doi:10.31083/ijp48988

Other claims from this paper (11)

Observation Stem oil yield was 1.07%.
Observation GC-MS found 23 compounds in leaf oil.
Observation GC-MS found 20 compounds in stem oil.
Observation Leaf oil contained 20.64% 2-pentadecanone.
Observation Leaf oil contained 16.74% phytol.
Observation Stem oil contained 34.43% di-n-octyl phthalate.
Observation Stem oil contained 15.97% eicosanoic acid esters.
Observation Leaf oil had inhibition zones of 18–26 mm.
Observation Stem oil had inhibition zones of 14–24 mm.
Observation Leaf oil showed stronger ferric-reducing power.
Observation Stem oil showed higher radical-scavenging potential.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Stem oil yield was 1.07%.

Taxon: Dioscorea dumetorumDioscorea dumetorume1
Organ / stage: steme0
Outcome: leaf and stem oils yieldede0
Value: 1.07%e0

Verbatim

e0
“The leaf and stem oils yielded 0.50% and 1.07%, respectively.”
✓ located verbatim in the source · abstract, characters 1272–1333

e1
“Dioscorea dumetorum (bitter yam)”
✓ located verbatim in the source · abstract, characters 12–44

Title

Chemical Composition, Antimicrobial and Antioxidant Activities of Dioscorea dumetorum (Bitter Yam) Leaves and Stem Essential Oil

Ganiyat K. Oloyede; Ayotomide O. Banjoko International Journal of Pharmacology 2026. doi:10.31083/ijp48988

Other claims from this paper (11)

Observation Leaf oil yield was 0.50%.
Observation GC-MS found 23 compounds in leaf oil.
Observation GC-MS found 20 compounds in stem oil.
Observation Leaf oil contained 20.64% 2-pentadecanone.
Observation Leaf oil contained 16.74% phytol.
Observation Stem oil contained 34.43% di-n-octyl phthalate.
Observation Stem oil contained 15.97% eicosanoic acid esters.
Observation Leaf oil had inhibition zones of 18–26 mm.
Observation Stem oil had inhibition zones of 14–24 mm.
Observation Leaf oil showed stronger ferric-reducing power.
Observation Stem oil showed higher radical-scavenging potential.

Observationobservedoriginal resultmeasured

Claim · model-written summary

GC-MS found 23 compounds in leaf oil.

Taxon: Dioscorea dumetorumDioscorea dumetorume1
Organ / stage: leafe0
Outcome: compoundse0
Value: 23e0

Verbatim

e0
“GC-MS analysis revealed 23 and 20 compounds dominated by 2-pentadecanone (20.64%) and phytol (16.74%) in the leaf oil, and di-n-octyl phthalate (34.43%) and eicosanoic acid esters (15.97%) in the stem oil.”
✓ located verbatim in the source · abstract, characters 1334–1539

e1
“Dioscorea dumetorum (bitter yam)”
✓ located verbatim in the source · abstract, characters 12–44

Title

Chemical Composition, Antimicrobial and Antioxidant Activities of Dioscorea dumetorum (Bitter Yam) Leaves and Stem Essential Oil

Ganiyat K. Oloyede; Ayotomide O. Banjoko International Journal of Pharmacology 2026. doi:10.31083/ijp48988

Other claims from this paper (11)

Observation Leaf oil yield was 0.50%.
Observation Stem oil yield was 1.07%.
Observation GC-MS found 20 compounds in stem oil.
Observation Leaf oil contained 20.64% 2-pentadecanone.
Observation Leaf oil contained 16.74% phytol.
Observation Stem oil contained 34.43% di-n-octyl phthalate.
Observation Stem oil contained 15.97% eicosanoic acid esters.
Observation Leaf oil had inhibition zones of 18–26 mm.
Observation Stem oil had inhibition zones of 14–24 mm.
Observation Leaf oil showed stronger ferric-reducing power.
Observation Stem oil showed higher radical-scavenging potential.

Observationobservedoriginal resultmeasured

Claim · model-written summary

GC-MS found 20 compounds in stem oil.

Taxon: Dioscorea dumetorumDioscorea dumetorume1
Organ / stage: steme0
Outcome: compoundse0
Value: 20e0

Verbatim

e0
“GC-MS analysis revealed 23 and 20 compounds dominated by 2-pentadecanone (20.64%) and phytol (16.74%) in the leaf oil, and di-n-octyl phthalate (34.43%) and eicosanoic acid esters (15.97%) in the stem oil.”
✓ located verbatim in the source · abstract, characters 1334–1539

e1
“Dioscorea dumetorum (bitter yam)”
✓ located verbatim in the source · abstract, characters 12–44

Title

Chemical Composition, Antimicrobial and Antioxidant Activities of Dioscorea dumetorum (Bitter Yam) Leaves and Stem Essential Oil

Ganiyat K. Oloyede; Ayotomide O. Banjoko International Journal of Pharmacology 2026. doi:10.31083/ijp48988

Other claims from this paper (11)

Observation Leaf oil yield was 0.50%.
Observation Stem oil yield was 1.07%.
Observation GC-MS found 23 compounds in leaf oil.
Observation Leaf oil contained 20.64% 2-pentadecanone.
Observation Leaf oil contained 16.74% phytol.
Observation Stem oil contained 34.43% di-n-octyl phthalate.
Observation Stem oil contained 15.97% eicosanoic acid esters.
Observation Leaf oil had inhibition zones of 18–26 mm.
Observation Stem oil had inhibition zones of 14–24 mm.
Observation Leaf oil showed stronger ferric-reducing power.
Observation Stem oil showed higher radical-scavenging potential.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Leaf oil contained 20.64% 2-pentadecanone.

Taxon: Dioscorea dumetorumDioscorea dumetorume1
Organ / stage: leafe0
Outcome: 2-pentadecanonee0
Value: 20.64%e0

Verbatim

e0
“GC-MS analysis revealed 23 and 20 compounds dominated by 2-pentadecanone (20.64%) and phytol (16.74%) in the leaf oil, and di-n-octyl phthalate (34.43%) and eicosanoic acid esters (15.97%) in the stem oil.”
✓ located verbatim in the source · abstract, characters 1334–1539

e1
“Dioscorea dumetorum (bitter yam)”
✓ located verbatim in the source · abstract, characters 12–44

Title

Chemical Composition, Antimicrobial and Antioxidant Activities of Dioscorea dumetorum (Bitter Yam) Leaves and Stem Essential Oil

Ganiyat K. Oloyede; Ayotomide O. Banjoko International Journal of Pharmacology 2026. doi:10.31083/ijp48988

Other claims from this paper (11)

Observation Leaf oil yield was 0.50%.
Observation Stem oil yield was 1.07%.
Observation GC-MS found 23 compounds in leaf oil.
Observation GC-MS found 20 compounds in stem oil.
Observation Leaf oil contained 16.74% phytol.
Observation Stem oil contained 34.43% di-n-octyl phthalate.
Observation Stem oil contained 15.97% eicosanoic acid esters.
Observation Leaf oil had inhibition zones of 18–26 mm.
Observation Stem oil had inhibition zones of 14–24 mm.
Observation Leaf oil showed stronger ferric-reducing power.
Observation Stem oil showed higher radical-scavenging potential.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Leaf oil contained 16.74% phytol.

Taxon: Dioscorea dumetorumDioscorea dumetorume1
Organ / stage: leafe0
Outcome: phytole0
Value: 16.74%e0

Verbatim

e0
“GC-MS analysis revealed 23 and 20 compounds dominated by 2-pentadecanone (20.64%) and phytol (16.74%) in the leaf oil, and di-n-octyl phthalate (34.43%) and eicosanoic acid esters (15.97%) in the stem oil.”
✓ located verbatim in the source · abstract, characters 1334–1539

e1
“Dioscorea dumetorum (bitter yam)”
✓ located verbatim in the source · abstract, characters 12–44

Title

Chemical Composition, Antimicrobial and Antioxidant Activities of Dioscorea dumetorum (Bitter Yam) Leaves and Stem Essential Oil

Ganiyat K. Oloyede; Ayotomide O. Banjoko International Journal of Pharmacology 2026. doi:10.31083/ijp48988

Other claims from this paper (11)

Observation Leaf oil yield was 0.50%.
Observation Stem oil yield was 1.07%.
Observation GC-MS found 23 compounds in leaf oil.
Observation GC-MS found 20 compounds in stem oil.
Observation Leaf oil contained 20.64% 2-pentadecanone.
Observation Stem oil contained 34.43% di-n-octyl phthalate.
Observation Stem oil contained 15.97% eicosanoic acid esters.
Observation Leaf oil had inhibition zones of 18–26 mm.
Observation Stem oil had inhibition zones of 14–24 mm.
Observation Leaf oil showed stronger ferric-reducing power.
Observation Stem oil showed higher radical-scavenging potential.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Stem oil contained 34.43% di-n-octyl phthalate.

Taxon: Dioscorea dumetorumDioscorea dumetorume1
Organ / stage: steme0
Outcome: di-n-octyl phthalatee0
Value: 34.43%e0

Verbatim

e0
“GC-MS analysis revealed 23 and 20 compounds dominated by 2-pentadecanone (20.64%) and phytol (16.74%) in the leaf oil, and di-n-octyl phthalate (34.43%) and eicosanoic acid esters (15.97%) in the stem oil.”
✓ located verbatim in the source · abstract, characters 1334–1539

e1
“Dioscorea dumetorum (bitter yam)”
✓ located verbatim in the source · abstract, characters 12–44

Title

Chemical Composition, Antimicrobial and Antioxidant Activities of Dioscorea dumetorum (Bitter Yam) Leaves and Stem Essential Oil

Ganiyat K. Oloyede; Ayotomide O. Banjoko International Journal of Pharmacology 2026. doi:10.31083/ijp48988

Other claims from this paper (11)

Observation Leaf oil yield was 0.50%.
Observation Stem oil yield was 1.07%.
Observation GC-MS found 23 compounds in leaf oil.
Observation GC-MS found 20 compounds in stem oil.
Observation Leaf oil contained 20.64% 2-pentadecanone.
Observation Leaf oil contained 16.74% phytol.
Observation Stem oil contained 15.97% eicosanoic acid esters.
Observation Leaf oil had inhibition zones of 18–26 mm.
Observation Stem oil had inhibition zones of 14–24 mm.
Observation Leaf oil showed stronger ferric-reducing power.
Observation Stem oil showed higher radical-scavenging potential.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Stem oil contained 15.97% eicosanoic acid esters.

Taxon: Dioscorea dumetorumDioscorea dumetorume1
Organ / stage: steme0
Outcome: eicosanoic acid esterse0
Value: 15.97%e0

Verbatim

e0
“GC-MS analysis revealed 23 and 20 compounds dominated by 2-pentadecanone (20.64%) and phytol (16.74%) in the leaf oil, and di-n-octyl phthalate (34.43%) and eicosanoic acid esters (15.97%) in the stem oil.”
✓ located verbatim in the source · abstract, characters 1334–1539

e1
“Dioscorea dumetorum (bitter yam)”
✓ located verbatim in the source · abstract, characters 12–44

Title

Chemical Composition, Antimicrobial and Antioxidant Activities of Dioscorea dumetorum (Bitter Yam) Leaves and Stem Essential Oil

Ganiyat K. Oloyede; Ayotomide O. Banjoko International Journal of Pharmacology 2026. doi:10.31083/ijp48988

Other claims from this paper (11)

Observation Leaf oil yield was 0.50%.
Observation Stem oil yield was 1.07%.
Observation GC-MS found 23 compounds in leaf oil.
Observation GC-MS found 20 compounds in stem oil.
Observation Leaf oil contained 20.64% 2-pentadecanone.
Observation Leaf oil contained 16.74% phytol.
Observation Stem oil contained 34.43% di-n-octyl phthalate.
Observation Leaf oil had inhibition zones of 18–26 mm.
Observation Stem oil had inhibition zones of 14–24 mm.
Observation Leaf oil showed stronger ferric-reducing power.
Observation Stem oil showed higher radical-scavenging potential.

Observationobservedoriginal resultpositivemeasured

Claim · model-written summary

Leaf oil had inhibition zones of 18–26 mm.

Taxon: Dioscorea dumetorumDioscorea dumetorume1
Organ / stage: leafe0
Outcome: inhibition zonese0
Direction: largere0
Value: 18–26 mme0
Comparator: stem oile0

Verbatim

e0
“Both oils exhibited broad-spectrum antimicrobial effects, with leaf oil showing larger inhibition zones (18–26 mm) than stem oil (14–24 mm).”
✓ located verbatim in the source · abstract, characters 1540–1680

e1
“Dioscorea dumetorum (bitter yam)”
✓ located verbatim in the source · abstract, characters 12–44

Title

Chemical Composition, Antimicrobial and Antioxidant Activities of Dioscorea dumetorum (Bitter Yam) Leaves and Stem Essential Oil

Ganiyat K. Oloyede; Ayotomide O. Banjoko International Journal of Pharmacology 2026. doi:10.31083/ijp48988

Other claims from this paper (11)

Observation Leaf oil yield was 0.50%.
Observation Stem oil yield was 1.07%.
Observation GC-MS found 23 compounds in leaf oil.
Observation GC-MS found 20 compounds in stem oil.
Observation Leaf oil contained 20.64% 2-pentadecanone.
Observation Leaf oil contained 16.74% phytol.
Observation Stem oil contained 34.43% di-n-octyl phthalate.
Observation Stem oil contained 15.97% eicosanoic acid esters.
Observation Stem oil had inhibition zones of 14–24 mm.
Observation Leaf oil showed stronger ferric-reducing power.
Observation Stem oil showed higher radical-scavenging potential.

Observationobservedoriginal resultpositivemeasured

Claim · model-written summary

Stem oil had inhibition zones of 14–24 mm.

Taxon: Dioscorea dumetorumDioscorea dumetorume1
Organ / stage: steme0
Outcome: inhibition zonese0
Value: 14–24 mme0

Verbatim

e0
“Both oils exhibited broad-spectrum antimicrobial effects, with leaf oil showing larger inhibition zones (18–26 mm) than stem oil (14–24 mm).”
✓ located verbatim in the source · abstract, characters 1540–1680

e1
“Dioscorea dumetorum (bitter yam)”
✓ located verbatim in the source · abstract, characters 12–44

Title

Chemical Composition, Antimicrobial and Antioxidant Activities of Dioscorea dumetorum (Bitter Yam) Leaves and Stem Essential Oil

Ganiyat K. Oloyede; Ayotomide O. Banjoko International Journal of Pharmacology 2026. doi:10.31083/ijp48988

Other claims from this paper (11)

Observation Leaf oil yield was 0.50%.
Observation Stem oil yield was 1.07%.
Observation GC-MS found 23 compounds in leaf oil.
Observation GC-MS found 20 compounds in stem oil.
Observation Leaf oil contained 20.64% 2-pentadecanone.
Observation Leaf oil contained 16.74% phytol.
Observation Stem oil contained 34.43% di-n-octyl phthalate.
Observation Stem oil contained 15.97% eicosanoic acid esters.
Observation Leaf oil had inhibition zones of 18–26 mm.
Observation Leaf oil showed stronger ferric-reducing power.
Observation Stem oil showed higher radical-scavenging potential.