Dimethyloleuropein

Dimethyloleuropein (Demethyloleuropein): A Comprehensive Reference

1. Identity, Nomenclature, and Chemical Characterization

The compound commonly referred to in the dietary supplement and phytochemical literature as dimethyloleuropein is most precisely named demethyloleuropein (the "di-" prefix appearing in some commercial or informal nomenclature is a misnomer derived from casual usage). The authoritative chemical name is demethyloleuropein, reflecting the absence of one methyl ester group relative to oleuropein. Its CAS Registry Number is 52077-55-1. It is catalogued in PubChem under CID 6450302, with the molecular formula C₂₄H₃₀O₁₃.

Chemically, demethyloleuropein belongs to the following compound classes: terpene glycoside; O-glycosyl compound; secoiridoid-skeleton; glycosyl compound; monoterpenoid; aromatic monoterpenoid; monocyclic monoterpenoid; tyrosol derivative; catechol; and phenol. In structural terms, it is the direct demethylated analog of oleuropein: where oleuropein possesses a methyl ester in its elenolic acid moiety, demethyloleuropein bears a free carboxylic acid at that position, yielding one fewer carbon substituent and a slightly reduced molecular weight.

Oleuropein, demethyloleuropein, and ligstroside — the most significant phenolic glycosides detected in olive fruit — belong to the secoiridoids class, a group of monoterpenoids typical of the Oleaceae family with a cleaved methylcyclopentane skeleton. Iridoids and secoiridoids are usually bound glycosidically; they are produced from the secondary metabolism of terpenes as precursors of different indole alkaloids.

The presence of three isoforms in both leaf and drupe matrices has been assessed for demethyloleuropein, with a characteristic [M-H]⁻ ion at m/z 525.1614 in high-resolution mass spectrometry. Only the prevailing isoform includes an exocyclic double bond between carbon atoms C⁸ and C⁹, typical of oleuropein and ligstroside; the remaining, less abundant isoforms include a C=C bond between C⁸ and C¹⁰.

2. Natural Sources and Botanical Origin

Demethyloleuropein is a phytochemical native to the genus Olea, family Oleaceae, and is found with greatest abundance in Olea europaea L. (the common olive tree). Olea europaea is a species characteristic mostly to the Mediterranean region, and its fruits are known as a source of olive oil.

2.1 Distribution within the Olive Plant

In Olea europaea, oleuropein, demethyloleuropein, ligstroside, and oleoside represent the predominant phenolic oleosides. Demethyloleuropein is detectable in multiple tissues of the olive tree, including leaves and drupes (fruits), though its quantitative distribution is markedly cultivar-dependent.

Olive leaves are rich in a wide variety of phenolic compounds, such as secoiridoids (oleuropein, ligstroside, dimethyloleuropein) and flavonoids (apigenin, luteolin, luteolin-7-O-glucoside), along with other phenolic compounds (hydroxytyrosol, tyrosol, caffeic acid, ferulic acid), that are responsible for several biological properties, including antioxidant and anti-inflammatory, antimicrobial, antiviral, anti-carcinogenic, as well as beneficial cardiovascular effects.

Secologanoside, oleuropein, hydroxy-oleuropein, demethyloleuropein, gallocatechin, luteolin-O-hexoside, diosmetin, oleanolic acid, and maslinic acid were detected in all twelve olive cultivars examined in both autumn and spring seasons. This confirms demethyloleuropein's status as a consistent, pan-cultivar constituent of olive leaves.

In the fruit (drupe), however, the compound's occurrence is notably cultivar-specific. Among 12 olive cultivars studied during fruit development, demethyloleuropein was not detected in cvs. Dolce d'Andria, Nocellara del Belice, and Nocellara Etnea. The content of phenolic compounds varied significantly among the cultivars and decreased during fruit development and maturation, with some compounds showing specificity for certain cultivars.

It has been suggested that demethyloleuropein may serve as a varietal marker, because its presence or absence in olive drupes is genetically determined. Demethyloleuropein is extracted from black olive drupes in very limited amounts and only in particular periods of the year.

With respect to maturation dynamics in the fruit: demethyloleuropein accumulates, reaching its maximum during black (full-ripeness) maturation, until it becomes the major constituent of black olives. It is possible that demethyloleuropein and related compounds are formed from oleuropein by the action of esterases, because esterase activity increases considerably during the first phase of maturation and reaches a maximum during black maturation. Demethyloleuropein is thus also regarded as an indicator of the maturation of the olives.

Beyond olive, demethyloleuropein-related secoiridoid structures have been identified in other members of the Oleaceae. A methylated derivative, 3′′,4′′-di-O-methyldemethyloleuropein, has been isolated from the stem bark of Fraxinus chinensis (Qin Pi), a tree commercially used in healthcare products in many countries.

3. Preparations and Commercial Forms

Demethyloleuropein is not commonly isolated and sold as a stand-alone dietary supplement ingredient. Instead, it reaches consumers as part of olive leaf extract (OLE) preparations, in which it co-occurs with oleuropein, hydroxytyrosol, ligstroside, and other phenolic compounds. OLE is abundant in polyphenolic compounds, broadly categorized into secoiridoids including oleuropein, dimethyloleuropein, and oleuropein-aglycone, simple phenols such as hydroxytyrosol and tyrosol, and flavonoids (e.g., apigenin and luteolin).

Preparations based on olive leaves, in the form of liquid extracts or tablets, have been commercialized as natural supplements against diabetes, high blood pressure, cardiovascular diseases, urinary tract infections, chronic fatigue symptoms, and to improve immune system function.

Common commercial forms of OLE preparations (within which demethyloleuropein is a constituent) include:

• Standardized capsules and tablets: Typically standardized to a stated oleuropein percentage (not specifically to demethyloleuropein).
• Liquid extracts and tinctures: Available as olive leaf concentrate or ethanol-based tinctures, dosed at 500–1,000 mg equivalent daily, typically taken as drops or mixed into beverages.
• Teas and infusions: Traditional preparation involves steeping 1–2 teaspoons (1–2 g) of dried olive leaves in hot water for 10–15 minutes, consumed 2–3 times daily.

Because demethyloleuropein is obtained from olive drupes in very limited amounts and only during specific periods of fruit maturation, enzymatic or chemical methods have been explored for its production. The availability of demethyloleuropein can be increased by selective hydrolysis of the methyl ester moiety of oleuropein, a secoiridoid present in large amounts in olive leaves. One method describes enzymatic hydrolysis via screening of a panel of hydrolases, with the best result obtained using α-chymotrypsin from bovine pancreas as biocatalyst.

4. Relationship to Oleuropein and the Broader Secoiridoid Context

To understand demethyloleuropein's role, it is important to understand its position within the olive secoiridoid metabolic network. The oleuropein molecule consists of three structural subunits: a polyphenol (hydroxytyrosol), a secoiridoid called elenolic acid, and a glucose molecule. Demethyloleuropein differs by the absence of the methyl ester on the elenolic acid portion, making it a structurally simpler but closely related compound.

Demethyloleuropein holds a specific biochemical role as a precursor to key virgin olive oil (VOO) secoiridoids. The secoiridoid derivatives resulting from the enzymatic hydrolysis of oleuropein, ligstroside, and demethyloleuropein — identified as the dialdehydic forms of decarboxymethyloleuropein and ligstroside aglycones (3,4-DHPEA-EDA and p-HPEA-EDA, respectively) and the aldehydic forms of oleuropein and ligstroside aglycones (3,4-DHPEA-EA and p-HPEA-EA, respectively) — are the most abundant phenolic components found in most oils, and among them oleuropein derivatives are those having the strongest antioxidant activity.

The enzymatic formation of 3,4-DHPEA-EDA from demethyloleuropein in model systems has been reported, but the occurrence of demethyloleuropein is cultivar-dependent, and therefore it would be expected that 3,4-DHPEA-EDA would only be found in olive oils produced from fruits containing high levels of demethyloleuropein. However, 3,4-DHPEA-EDA is one of the most abundant phenolics in most olive oils regardless of the presence of demethyloleuropein in the corresponding olive fruits, indicating that other metabolic pathways also generate this compound.

The recombinant olive β-glucosidase enzyme (OepGLU) showed activity on the major olive phenolic glycosides, with the highest levels with respect to oleuropein, followed by ligstroside and demethyloleuropein. This enzymatic hierarchy explains why demethyloleuropein tends to accumulate more in olives when β-glucosidase activity is relatively lower.

5. Traditional and Historical Use

Demethyloleuropein itself has no documented tradition of use as an isolated compound. Its history is inextricably bound to the traditional medicinal use of the olive leaf and olive fruit preparations in which it occurs as a constituent. The following section therefore addresses the traditional use of olive leaf and olive-derived preparations.

The olive is one of the oldest cultivated plants in the world. Olive trees have been the economic backbone and commodity of international commerce for Eastern and Mediterranean cultures for at least 7,000 years.

The first medicinal application attested in history dates back to the ancient Egyptian civilization. During centuries, the use of olive leaf preparations in traditional medicine spread to many different countries.

There is reference for use in the management of fevers in ancient Greece. In the Hippocratic Corpus there are more than sixty medicinal uses for olive oil, many referenced for use in skin disorders and fatigue. Throughout history there are multiple references for use of olive leaf in the treatment of fevers, including intermittent fever, typhoid fever, and bilious fever. The leaf was also traditionally used for the treatment of malaria.

Olive leaves have been used in traditional Mediterranean folk medicine for millennia to treat fevers, infections, hypertension, diabetes, diarrhea, and respiratory conditions. Infusion of leaves is taken orally to reduce fever and as an anti-inflammatory tonic.

In the Middle East, olive leaf use was also prominent. In the Middle East, olive leaf has been a staple in traditional medicine for centuries. Islamic scholars and physicians like Avicenna (Ibn Sina) wrote about the health benefits of olive leaf in their medical texts. It was commonly used to treat high blood pressure, diabetes, and various infections.

In North Africa, leaves of O. europaea are used in Tunisian folk medicine as a remedy for many inflammation types and bacterial infections such as gingivitis, otitis, icterus, and cough. Fruits and leaves are used to treat hemorrhoids and rheumatism, and as a vasodilator in vascular disorders. Infusions of leaves are used as an ointment to treat eye infections or as a mouthwash to relieve sore throat.

In Mediterranean folk medicine, the preparation of olive leaf has also been used as a common tonic for gout. The plant has long been known for its diuretic actions, which were used for fluid retention and nephritis.

Traditional preparations consisted predominantly of aqueous leaf infusions (teas), decoctions, poultices, and direct application of crushed leaves. Olive leaf has been a traditional remedy in the Mediterranean region and Europe for hypertension and atherosclerosis; in this part of the world it is easy to find an olive tree to harvest the leaves, so it is common to make an infusion of fresh or dried leaves.

6. Key Constituents and Active Compounds in Context

When demethyloleuropein is consumed as part of olive leaf extract, it co-occurs with a complex matrix of bioactive compounds. Olive leaves contain a wide variety of phenolic compounds belonging to phenolic acids, phenolic alcohols, flavonoids, and secoiridoids, and include also many other pharmacologically active compounds such as oleuropein (OE), hydroxytyrosol (HT), tyrosol, coumaric acid, ferulic acid, caffeic acid, vanillic acid, rutin, verbascoside, luteolin, quercetin, dimethyloleuropein, and ligstroside.

In particular, oleuropein content — the major phenolic compound of olive leaves — varies from 17 to 23%. Demethyloleuropein is present at lower absolute concentrations but has been consistently identified across cultivars and seasons.

The broader secoiridoid class to which demethyloleuropein belongs has been attributed multiple mechanisms of biological action. Oleuropein derivatives — the class to which demethyloleuropein belongs — exhibit the highest antioxidant activity, protein-denaturing/protein-cross-linking properties, cytotoxic effects, and effectiveness as chronic disease preventive agents.

The phenolic ortho-diphenol (catechol) structural feature, present in demethyloleuropein's hydroxytyrosol moiety, is particularly relevant to antioxidant mechanism. The exact mechanism of the antimicrobial activity of secoiridoids has not been fully elucidated, although some authors have proposed that it is due to the presence of the ortho-diphenolic system (catechol).

Demethyloleuropein also acts as a biosynthetic gateway: demethyloleuropein is presumed to act as a precursor for the formation of 3,4-DHPEA-EDA (oleocanthal-related dialdehydic secoiridoid) during crushing, due to an increase in esterase and β-glucosidase activity.

7. Scientific Evidence by Area of Activity

A critical caveat applying to this entire section: The overwhelming body of peer-reviewed research on secoiridoid biological activity from olive leaf extract has been conducted on oleuropein, hydroxytyrosol, or on unfractionated olive leaf extract — not on isolated demethyloleuropein. Where specific evidence for demethyloleuropein's independent activity exists, it is noted; where evidence refers to the broader secoiridoid class or to olive leaf extract (of which demethyloleuropein is a constituent), this is stated explicitly. No clinical (human) trials on isolated demethyloleuropein were identified in the available peer-reviewed literature.

7.1 Antioxidant Activity

The phenolic compounds present in olive leaves, especially the secoiridoids including oleuropein, are associated with antioxidant, antihypertensive, hypoglycemic, hypocholesterolemic, and cardioprotective activity.

Several studies have shown a wide variety of in vitro and in vivo properties for olive leaf secoiridoids, including antioxidant, antiviral, antibacterial, and anti-inflammatory activities. Demethyloleuropein-containing olive leaf extracts have demonstrated measurable radical-scavenging capacity in DPPH and ABTS assays, though these results are attributed to the total phenolic profile rather than specifically to demethyloleuropein alone.

The evidence base for antioxidant activity of the broader secoiridoid class to which demethyloleuropein belongs is extensive but predominantly in vitro. This limits direct translation of results to human physiology.

7.2 Anti-inflammatory Activity

In a study examining secoiridoid glucosides from Fraxinus chinensis, a structurally related compound — 3′′,4′′-di-O-methyldemethyloleuropein — exhibited inhibition (IC₅₀ ≤ 7.65 μg/mL) of superoxide anion generation by human neutrophils in response to formyl-L-methionyl-L-leucyl-L-phenylalanine/cytochalasin B (fMLP/CB). This result is for a methylated derivative of demethyloleuropein, not demethyloleuropein itself, and was obtained in an in vitro assay; direct extrapolation to demethyloleuropein in humans is not warranted.

The main demonstrated biological activities of olive leaf secoiridoids more broadly are antioxidant and anti-inflammatory effects, as well as the ability to treat oxidant and inflammatory-related diseases such as cardiovascular disease, hepatic disorder, obesity, and diabetes. These findings relate predominantly to oleuropein and hydroxytyrosol, which are the better-studied constituents.

7.3 Antimicrobial Activity

According to many reports, phenolic compounds isolated from olive leaves have very good biological activities, especially antimicrobial. These phenolic compounds have a significant pleiotropic effect including antimicrobial activity against Helicobacter pylori, Campylobacter jejuni, Staphylococcus aureus, Bacillus cereus, Escherichia coli, and Salmonella enteritidis.

The antimicrobial evidence for olive leaf phenolics as a class is predominantly in vitro (minimum inhibitory concentration studies). No published human clinical trials specifically testing demethyloleuropein's antimicrobial efficacy were identified. Results pertain to complex extracts in which demethyloleuropein is a minor component relative to oleuropein.

7.4 Cardiovascular Effects (Olive Leaf Extract Context)

Demethyloleuropein is one of several secoiridoids that contribute to the cardiovascular-related activity attributed to olive leaf extract. The evidence of the protective effect of virgin olive oil polyphenols for cardiovascular diseases has been strengthened by the approved health claim based on the scientific report of the EFSA Panel on Dietetic Products, Nutrition, and Allergies: olive oil polyphenols contribute to the protection of blood lipids from oxidative stress. The claim may be used only for olive oil which contains at least 5 mg of hydroxytyrosol and its derivatives (e.g., oleuropein complex and tyrosol) per 20 g of olive oil. This EFSA claim applies to hydroxytyrosol and its derivatives as a category, within which demethyloleuropein derivatives may fall, but demethyloleuropein itself is not named specifically.

Olive leaf secoiridoids can inhibit low-density lipoprotein (LDL) oxidation and lipoxygenases. Furthermore, they have demonstrated hypoglycemic and hypocholesterolemic activities. Again, the specific contribution of demethyloleuropein versus oleuropein or hydroxytyrosol in these effects has not been separately established in clinical trials.

7.5 Role as a Metabolic Precursor to Bioactive Compounds in Olive Oil

One of the most clearly documented roles for demethyloleuropein is as a biochemical precursor during olive oil production. Oleuropein, demethyloleuropein, and ligstroside are the most significant phenolic glycosides detected in olive fruit. The main phenolic compounds detected in VOO are the secoiridoid derivatives resulting from the enzymatic hydrolysis of these olive fruit glycosides. The aglycones and decarboxylated derivatives formed from demethyloleuropein are among the main bioactive phenolics in finished extra-virgin olive oil, and are associated with the oil's documented health benefits. This role is pharmacologically relevant but is not the same as direct therapeutic activity of the intact demethyloleuropein molecule.

8. Body Systems and Health Areas Associated with Demethyloleuropein/Olive Leaf Secoiridoids

Based on available research into the broader secoiridoid class from olive leaf, the following body systems are associated with activity (noting that evidence for each varies considerably in strength):

• Cardiovascular system: The main component of all the constituents of olive leaf extract, oleuropein, has antimicrobial, antioxidative, antiviral, antiatherogenic, cardioprotective, and antihypertensive properties.
• Metabolic/endocrine system: Secoiridoids from olive leaf have been associated with hypoglycemic and hypocholesterolemic effects in animal and in vitro models. They exhibit hypoglycemic and hypocholesterolemic activities.
• Immune system/infection: Olive leaves have been used in traditional and folk medicine since ancient times for their therapeutic and medicinal properties. Olive leaf is studied as an important source of antimicrobials with low cost and used in medicine.
• Gastrointestinal system: Secoiridoids, including oleuropein and its related compounds, are the main phenols in olive fruit and have been associated with relevant gastrointestinal effects.
• Musculoskeletal system: In Mediterranean folk medicine, the preparation of olive leaf has been used as a common tonic for gout.

9. Dosage Forms and Dosages Reported in Studies

No clinical studies providing dosage information for isolated demethyloleuropein were identified in the peer-reviewed literature accessible for this article. The following dosage information pertains to olive leaf extract preparations (OLE), which are the delivery form in which demethyloleuropein reaches end consumers.

A 2022 systematic review and meta-analysis of 12 randomized controlled trials (RCTs) involving 819 adults found that OLE supplementation at doses of 500–1,000 mg/day significantly reduced systolic blood pressure by 3.86 mmHg overall.

One well-studied liquid OLE product provided 136.2 mg of oleuropein and 6.4 mg of hydroxytyrosol daily in a dose of two teaspoons twice daily. The proportion of demethyloleuropein in such preparations is not standardized or routinely reported in clinical trial publications.

Traditional preparation involves steeping 1–2 teaspoons (1–2 g) of dried olive leaves in hot water for 10–15 minutes, consumed 2–3 times daily.

Given the absence of clinical trials targeting demethyloleuropein specifically, no evidence-based dosage recommendation for this compound as an isolated ingredient can be provided.

10. Bioavailability and Metabolism

No pharmacokinetic studies specifically examining demethyloleuropein's absorption, distribution, metabolism, and excretion (ADME) in humans were identified. Available evidence relates to the metabolic fate of the secoiridoid class as a whole, particularly oleuropein.

The three secoiridoid precursors (free hydroxytyrosol, oleuropein, and secoiridoid aglycones) reach the colon and undergo intense microbial metabolism. Oleuropein showed the most diverse microbial transformations in caecum. It is likely that demethyloleuropein undergoes analogous enzymatic transformations in the gastrointestinal tract — including hydrolysis by intestinal and microbial glucosidases and esterases — releasing hydroxytyrosol and other phenolic metabolites. However, this inference has not been specifically confirmed for demethyloleuropein in published human studies.

Enhanced absorption of a metabolite of oleuropein at the colon could increase bioavailability, and co-administration of oleuropein with one or more probiotics having a glycosidase and/or esterase activity can increase the degradation in situ of the secoiridoid to optimize the absorption and consequent effect of a metabolite thereof. Whether this principle applies similarly to demethyloleuropein is plausible but not directly demonstrated.

11. Safety Considerations

No dedicated toxicological studies specific to isolated demethyloleuropein in humans were identified in the peer-reviewed literature accessible for this article. The following observations are grounded in available data:

• Status as a natural food component: Demethyloleuropein is a constituent of olives and olive oil as normally consumed. The most abundant polyphenols in olive fruit are oleuropein, demethyloleuropein, ligstroside, and nüzhenide. Its presence in human diets through olive consumption provides a background of empirical safety across millennia of Mediterranean dietary practice.
• OLE general tolerability: Olive leaf extract in standardized doses of 500–1,000 mg/day has been used in multiple clinical trials without notable serious adverse events; however, these trials were conducted on the full extract, not on isolated demethyloleuropein.
• Gastrointestinal effects: Because demethyloleuropein is a bitter-tasting phenolic glycoside — all olive secoiridoids share this property — gastrointestinal discomfort at higher doses is plausible but specific dose-response data for demethyloleuropein are not available.
• Antioxidant-prooxidant duality: Like other olive polyphenols at high concentrations, demethyloleuropein's structural catechol group can exhibit pro-oxidant behavior under certain conditions. Oleuropein plays a key role as a pro-oxidant as well as an antioxidant in cancer cell contexts. This bidirectionality, documented for closely related oleuropein, may apply to demethyloleuropein as well but has not been specifically examined.
• Absence of dedicated clinical safety data: No human clinical trials testing demethyloleuropein in isolation, with formal safety endpoints, were identified in the peer-reviewed literature. Safety inferences are therefore extrapolated from the broader OLE research context and from the compound's natural dietary presence.

12. Summary of Evidence Strength

The overall evidence base specific to demethyloleuropein as an isolated compound is preliminary and primarily in vitro or structural/phytochemical in nature. Key points:

• Demethyloleuropein's identity as a naturally occurring olive secoiridoid is well-established by multiple analytical and phytochemical studies.
• Its biological activities — antioxidant, antimicrobial, anti-inflammatory — are plausible based on structural analogy to closely related oleuropein and shared membership in the secoiridoid class, but have not been confirmed in isolated-compound human trials.
• Its most clearly documented functional role is as a biochemical precursor to important bioactive compounds in extra-virgin olive oil (3,4-DHPEA-EDA), established in plant biochemistry research.
• Its possible function as a cultivar-specific varietal marker in olive phenolic profiling is supported by metabolic and transcriptomic studies.
• No clinical dosage, pharmacokinetic, or formal safety data specific to isolated demethyloleuropein currently exist in the published human research literature.

References

• PubChem — Demethyloleuropein (CID 6450302)
• ChemSpider — Demethyloleuropein (CSID 4952913)
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