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momordicine IV

compound / compound-momordicine-iv

モモルジシンIV

Momordicine IV is a cucurbitane-type triterpenoid identified as the bitter principle in the bitter gourd extract being studied.

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  1. Overview
  2. Sources for this overview (3)
  3. Topic hubs
  4. Follow the connections
  5. Related entries (10)
  6. Sensory (2)
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Reading the bitterness

Momordicine IV is a cucurbitane-type triterpenoid identified as one of two major bitter-contributing components in a dose-over-threshold analysis of the dichloromethane fraction of 75% methanol extract of bitter gourd and dried fruit material.

In human recognition-threshold research testing purified momordicine IV in 3% ethanol, strong bitterness was confirmed, and it is positioned as a major contributing component in dose-over-threshold analysis as well. However, the precise numerical value of the threshold cannot be determined from this abstract-level confirmation.

Meanwhile, a 1982 structural study identified momordicoside K and L as bitter principles from the same immature bitter gourd fruit, treating a different compound as the bitter principle than momordicine IV. Although both target the same immature fruit, the designation of 「苦味主成分」 (in translation: "bitter principles") does not align; this is an indirect discrepancy and does not experimentally refute the bitterness of momordicine IV itself.

The compound name 「モモルジシンIV」 (in translation: "momordicine IV") itself was first given in 2006 research to a novel cucurbitane glycoside isolated from bitter gourd leaves. At that time it was not recorded as a bitter substance for humans, but as an oviposition-avoidance substance against a species of leaf miner fly. Human taste data are absent from this original description, and the plant part is leaves, not fruit. Whether the structure treated in 2024 bitter characterization is identical to this 2006 compound remains to be confirmed.

Sources for this overview

  1. Major Bitter-Tasting Compounds from the Dichloromethane Fraction of Bitter Gourd (Fruit of Momordica charantia L.) Extract and Their Precursors

    Cai X; Lin Z; Zheng Q; Liao M; Li H; Feng H; Chen H; Zhang Y; Chen X; Liang D / 2024 / journal article / abstract checked

    Checked for this overview: Confirmed that dose-over-threshold analysis treated it as one of the major bitter-contributing components / Confirmed strong bitterness in 3% ethanol and major contribution in dose-over-threshold analysis

  2. Studies on the Constituents of Momordica charantia L. IV. Characterization of the New Cucurbitacin Glycosides of the Immature Fruits. (2) Structures of the Bitter Glycosides, Momordicosides K and L

    Okabe H; Miyahara Y; Yamauchi T / 1982 / journal article / full text checked

    Checked for this overview: Confirmed that 1982 research treated different compounds as bitter principles

  3. Cucurbitane Glucosides from Momordica charantia Leaves as Oviposition Deterrents to the Leafminer, Liriomyza trifolii

    Mekuria DB; Kashiwagi T; Tebayashi S; Kim CS / 2006 / journal article / abstract checked

    Checked for this overview: Verified that the compound name derives from 2006 leaf-based oviposition-avoidance research

Follow the connections

momordicine IV →is a bitter principle of→ bitter melon

momordicine IV →elicits→ bitterness →can be measured separately …→ astringency

Structured claims — open a section to read each claim's confidence, evidence and limits

Sensory (2)

momordicine IV is a bitter principle of bitter melonsupported

Scope: The dichloromethane fraction of a 75% methanol extract, and quantified dried fruit material

Note: Precursors in fresh fruit and other cultivars require separate characterization.

A dose-over-threshold analysis identified momordicine IV as one of 2 principal bitterness-contributing compounds in the analyzed fraction and fruit material.
Limitations: Isomerization of acid-labile precursors complicates extrapolation to fresh fruit.
Source: Major Bitter-Tasting Compounds from the Dichloromethane Fraction of Bitter Gourd (Fruit of Momordica charantia L.) Extract and Their Precursors (Cai X; Lin Z; Zheng Q; Liao M; Li H; Feng H; Chen H; Zhang Y; Chen X; Liang D, 2024) · abstract checked
Limits: A 1982 structural study (Okabe et al.) identified momordicoside K and momordicoside L as the bitter principles of immature bitter gourd fruit. Verbatim from the abstract: "momordicosides K and L, bitter principles in the fruits of Momordica charantia L." This does not agree with the identification in the 2024 attribution, which names a different compound as the principal bitterness contributor from the same immature fruit.
Limitations: This 'limits' connection is indirect, based on the disagreement between studies over the attribution of the principal bitter compound in immature fruit; it does not experimentally refute the bitterness of momordicine IV itself. The compounds may still not be mutually exclusive at the level of individual compounds.
Source: Studies on the Constituents of Momordica charantia L. IV. Characterization of the New Cucurbitacin Glycosides of the Immature Fruits. (2) Structures of the Bitter Glycosides, Momordicosides K and L (Okabe H; Miyahara Y; Yamauchi T, 1982) · full text checked
Context: Verbatim: analysis of the polar fraction of a methanol extract of M. charantia leaves 'resulted in the isolation of a novel cucurbitane glucoside, 7-O-beta-D-glucopyranosyl-3,23-dihydroxycucurbita-5,24-dien-19-al, named momordicine IV', and at 20.3 microg/cm2 on the leaf surface this compound 'deterred oviposition by L. trifolii significantly'. The compound name momordicine IV therefore predates the 2024 sensory characterization by 18 years, and was originally described not as a human bitterness compound but as an insect oviposition deterrent.
Limitations: There is no human taste data. The plant part is leaf, not fruit. Whether the structure Cai 2024 assayed under the name momordicine IV is identical to this 3,23-dihydroxy-5,24-dien-19-al should be confirmed once the full text of Cai is available.
Source: Cucurbitane Glucosides from Momordica charantia Leaves as Oviposition Deterrents to the Leafminer, Liriomyza trifolii (Mekuria DB; Kashiwagi T; Tebayashi S; Kim CS, 2006) · abstract checked
Context: In the same oviposition-deterrence bioassay, momordicine II significantly deterred L. trifolii oviposition at 75.6 microg/cm2 on the leaf surface. The abstract states that combining the two compounds showed no synergistic effect. Momordicine II is not yet listed as an independent entity in this database.
Limitations: This is insect-deterrence data, not human taste data. Because momordicine II itself is not listed in entities.csv, this row is positioned only as contextual information for the claim about momordicine IV's bitterness above.
Source: Cucurbitane Glucosides from Momordica charantia Leaves as Oviposition Deterrents to the Leafminer, Liriomyza trifolii (Mekuria DB; Kashiwagi T; Tebayashi S; Kim CS, 2006) · abstract checked
Show datacompound-momordicine-iv —is_a_bitter_principle_of→ ingredient-bitter-gourd
claim: clm-momordicine-bitter / type: sensory / updated: 2026-08-30
momordicine IV elicits bitternesssupported

Scope: Purified compound in 3% ethanol, in the threshold study cited

Note: Threshold and contribution are matrix-specific.

A sensory-guided study showed that momordicine IV exhibits a strong bitterness and was identified, through dose-over-threshold analysis, as a major contributor.
Limitations: The exact threshold should be extracted from the full text before publishing the number.
Source: Major Bitter-Tasting Compounds from the Dichloromethane Fraction of Bitter Gourd (Fruit of Momordica charantia L.) Extract and Their Precursors (Cai X; Lin Z; Zheng Q; Liao M; Li H; Feng H; Chen H; Zhang Y; Chen X; Liang D, 2024) · abstract checked
Show datacompound-momordicine-iv —elicits→ sensation-bitter
claim: clm-momordicine-elicits-bitter / type: sensory / updated: 2026-08-30

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