Visnea mocanera

Visnea mocanera (Mocán): A Comprehensive Reference

1. Identity, Taxonomy, and Botanical Description

Taxonomic Classification

Visnea is a monotypic genus of flowering plants in the family Pentaphylacaceae, and the genus contains a single species, Visnea mocanera, a tree native to the Canary Islands and Madeira. Under APG IV classification, the species is placed in the order Ericales, family Pentaphylacaceae, tribe Freziereae.

The accepted full scientific name is Visnea mocanera L.f. (i.e., named by Carl Linnaeus the Younger, abbreviated "L.f." to distinguish him from his father). The genus was first described by Carl Linnaeus the Younger in 1782 and published in Supplementum Plantarum, page 36. Accepted synonyms in the botanical literature include Mocanera canariensis J.St.-Hil. and Visnea canariensis Oken.

The genus name Visnea honours Gérard de Visme (c. 1725 – c. 1797), a French and English merchant in Lisbon, Portugal. The species epithet mocanera derives from its local vernacular name. Common names include mocán or mocanero in Spanish. The native peoples of the Canary Islands called the sweet fruits of this tree yoyas.

Botanical Description

The plant is an evergreen tree that can grow up to 15 metres tall, with branches that are more or less horizontal or sometimes pendulous. Leaves are ovate-lanceolate or lanceolate, rather tough, dark green, up to 6 cm long, with margins that are dentate-serrate. Flowers are bell-shaped, creamy-white, and solitary or in small clusters. Fruits are globose and blackish-purple when ripe.

This evergreen tree tends to be small, reaching a height of no more than 4 metres in most cases, though in exceptional circumstances it can reach 10 metres. The leaves are simple, alternate, elliptical-lanceolate, 4–6 cm long and 2.5–3 cm wide, somewhat leathery with either an entire or slightly serrated margin; they are shiny and deep dark green on the upper side and paler on the underside; when juvenile specimens are backlit, they can be seen to be covered in fine hairs.

Palaeobotanical interest attaches to the genus: four fossil seeds of a Visnea sp. have been described from middle Miocene strata of the Fasterholt area near Silkeborg in Central Jutland, Denmark, indicating a once wider geographical distribution of the lineage.

Native Range and Habitat

The native range of this species is Madeira and the Canary Islands; it is a tree and grows primarily in the desert or dry shrubland biome. It is characteristic of thermophile forests and the driest variants of evergreen woods, growing from 200 to 1,000 metres altitude and can be locally common or even dominant in certain sectors. It is found on Madeira and all the Canary Islands except Lanzarote, and is extremely rare in Fuerteventura and uncommon in Gran Canaria.

Common Preparations and Forms

The fruits from Visnea mocanera, also named "mocán," are consumed fresh and in different drinks by the Canary natives (Spain) due to their medicinal and nutritive properties. Preparations documented in scientific studies and ethnobotanical records include:

• Fresh fruit consumed directly as food.
• A beverage known as chacerquén or checerquén, made from the fruits, was prepared by the pre-Hispanic inhabitants of the Canaries and regarded as a medicinal panacea.
• Aqueous infusions (decoctions/teas) of leaves and fruits used in folk medicine.
• Chemical studies of the leaves have yielded lipid-based and triterpenic fractions, and acetone, methanol, and aqueous infusion preparations of the leaves have been used in antimicrobial studies.
• Fruit syrup (used as a vehicle in multiple rodent pharmacological studies).
• Leaf extract (standardised methanol and acetone extracts used in preclinical research, and a leaf extract has been noted as an ingredient in some commercial dietary supplement products).

2. Traditional and Historical Use

Pre-Hispanic and Guanche Use

Historical chronicles disclose that the Guanches — the pre-Hispanic indigenous population of Tenerife — cultivated crops and gathered wild plants, notably Visnea mocanera, an endemic plant to the Canaries and Madeira commonly known as mocán. Archaeobotanical results from excavated sites suggest that most finds correspond to wild plants collected for food, fuel, and possibly timber, and that Pinus canariensis and Visnea mocanera were gathered for consumption.

Historical documents indicate that Visnea mocanera was used to produce a beverage called chacerquem that could be stored and had medicinal properties. The pre-Hispanic inhabitants of the Canaries regarded this beverage, known as chacerquén or checerquén, as a medicinal panacea.

Canary Islands Ethnobotanical Tradition

The fruits and leaves of Visnea mocanera have historically been consumed as food and used to prepare infusions believed to aid digestion and alleviate gastrointestinal discomfort; several ethnobotanical surveys from the Canary Islands document the use of mocán fruits for digestive complaints such as mild indigestion and stomach aches.

Additional traditional uses documented in the ethnobotanical and pharmacological literature include topical use of leaf preparations as a wound-healing agent (cicatrizant and vulnerary — i.e., applied to promote the healing of cuts and injuries), and oral use for the management of diarrhoea. Studies of the antimicrobial activity of acetone and methanol extracts as well as an aqueous infusion obtained good experimental results that justify the folk use of this species as a cicatrizant and vulnerary agent.

There is a lack of robust scientific studies confirming these folk uses or elucidating the mechanisms involved; most references to such traditional benefits come from oral tradition and historical documents rather than modern experimental evidence.

3. Key Constituents and Active Compounds

Phenolic Compounds — Fruits and Leaves

The leaves and fruits of mocán have been analysed by TLC and HPLC to establish their phenolic composition. The fruits are richer than the leaves in phenolics, with 4% procyanidins, 4% catechins, 3% total polyphenols, 0.6% low-polymerisation polyphenols, and 0.1% anthocyanins.

A detailed 1996 study published in the Journal of Agricultural and Food Chemistry by Hernández-Pérez and colleagues identified a broad range of phenolic compound families in the fruits:

• Benzoic acid derivatives: p-hydroxybenzoic acid, protocatechuic acid, and gallic acid.
• Benzoic aldehydes: p-hydroxybenzaldehyde, vanillic aldehyde, and syringic aldehyde.
• Cinnamic acids: p-coumaric acid and ferulic acid.
• Flavan-3-ols: (+)-catechin, (−)-epicatechin, and procyanidins.
• Flavonols and their glycosides: quercetin, myricetin, and kaempferol; glycosides including isorhamnetin 3-O-glucoside, kaempferol 3-O-rutinoside, quercetin 3-O-rhamnoside, and quercetin 3-O-galactoside.
• Anthocyanins: glycosides of delphinidin, cyanidin, petunidin, peonidin, and malvidin.

Flavan-3-ols in Seeds

The mocán fruits are small berries containing small seeds in which analysis by HPLC-PAD and HPLC-MS shows a high concentration of flavan-3-ols, mainly catechin and procyanidin dimers and trimers. Evaluation of the free radical scavenging activity of the seed extracts and of the individualised compounds shows high antioxidant activity; the flavan-3-ols identified show differences in that activity, depending on the numbers and structure of units forming the procyanidins.

Triterpenic Compounds and Sterols — Leaves

A chemical study of Visnea mocanera leaves yielded lupeol and β-sitosterol fatty esters, as well as β-sitosterol and the triterpenic acids: betulinic, ursolic, platanic, 2α,3β-dihydroxy-ursan-12-en-28-oic, and 2α,3β-dihydroxy-olean-12-en-28-oic acids.

These triterpenic and steroidal compounds are pharmacologically relevant classes. Lupeol, for example, is a pentacyclic triterpene found in a variety of edible plants. The antimicrobial activity of lupeol-containing Visnea mocanera leaf extract has been specifically cited in the lupeol literature; lupeol has been reported to exhibit anti-viral activity. Ursolic acid and betulinic acid, also identified in the leaves, are well-studied triterpenes with their own extensive preclinical pharmacological profiles in the broader literature.

Summary of Chemical Profile by Plant Part

• Fruits: Rich in polyphenols, procyanidins, catechins, flavonol glycosides, anthocyanins, and organic acids.
• Seeds: Especially high concentrations of flavan-3-ols (catechin, procyanidin oligomers).
• Leaves: Triterpenic acids (betulinic, ursolic, platanic, and two dihydroxy derivatives), lupeol, β-sitosterol and their fatty esters, alongside phenolic compounds.

4. Scientific Evidence by Area of Use

All published pharmacological evidence to date is preclinical (in vitro or animal models). No controlled human clinical trials on Visnea mocanera as a whole extract or ingredient have been identified in the peer-reviewed literature. The evidence base therefore remains preliminary and cannot be extrapolated directly to humans without further study.

4.1 Antioxidant Activity

Type of evidence: In vitro and ex vivo

A study by Dueñas et al. published in Food Chemistry (2003) examined the phenolic composition and antioxidant activity of mocán seeds. The evaluation of the free radical scavenging activity of the seed extracts and of the individualised compounds shows high antioxidant activity. The flavan-3-ols identified show differences in that activity, depending on the numbers and structure of units forming the procyanidins. This indicates that oligomeric procyanidins contribute differentially to radical scavenging capacity, with structural complexity (degree of polymerisation) being a modifying factor.

The fruits are richer than the leaves in phenolics, with 4% procyanidins and 4% catechins, which correlates with higher antioxidant potential in fruit preparations relative to leaf preparations.

Limitation: All antioxidant data are from in vitro assays. In vitro antioxidant measurements do not reliably predict in vivo antioxidant effects in humans due to absorption, metabolism, and bioavailability factors.

4.2 Antimicrobial Activity

Type of evidence: In vitro (laboratory microbiological assays)

A study by Hernández-Pérez et al., published in the Journal of Ethnopharmacology in 1994, conducted chemical and microbiological studies on V. mocanera leaf extracts. The chemical study of leaves yielded lupeol, β-sitosterol fatty esters, β-sitosterol, and multiple triterpenic acids; studies of the antimicrobial activity of acetone and methanol extracts as well as an aqueous infusion were also performed, and the good experimental results obtained justify the folk use of this species as a cicatrizant and vulnerary agent.

Hernández-Pérez et al. (1994) reported the antimicrobial activity of the lupeol-containing Visnea mocanera leaf extract.

The presence of phenolic compound families identified in mocán could account for the antimicrobial, anti-inflammatory, analgesic, antiulcerogenic, hemostatic, astringent, cicatrizant, vulnerary, and psychostimulant activities found in previous studies.

Limitation: Evidence is entirely in vitro. The specific organisms tested, minimum inhibitory concentrations, and comparative benchmarks against reference antibiotics are not available from the published abstracts. No clinical evidence for antimicrobial use exists.

4.3 Analgesic and Anti-Inflammatory Activity

Type of evidence: Animal (rodent) models

A 1994 study by Hernández-Pérez, Sánchez-Mateo, Darias, and Rabanal, published in Phytotherapy Research (vol. 8, pp. 465–469), systematically screened several extracts of V. mocanera for analgesic, antipyretic, anti-inflammatory, and ulcerogenic properties in mice and rats:

• The acetone extract from the leaves and the syrup from the fruits exerted central analgesic properties, associated with significant but transient anti-inflammatory effects on acute inflammatory processes; the acetone extract also possessed topical anti-inflammatory effects.
• The extracts assayed did not display antipyretic or ulcerogenic activity.
• Sub-acute toxicological experiments indicated a very low toxicity in mice.

Limitation: Animal study only. Mechanisms of analgesic action were characterised as "central" (i.e., potentially acting via the CNS), but specific receptor or biochemical targets were not identified in the available abstract. No translation to human dose or clinical relevance can be inferred.

4.4 Hemostatic and Gastrointestinal Effects

Type of evidence: Animal (rodent) models

A 1995 study by Hernández-Pérez, Sánchez-Mateo, Darias, and Rabanal, published in the Journal of Ethnopharmacology (vol. 46, pp. 95–100), specifically examined the effect of several extracts of V. mocanera on bleeding time, gastrointestinal transit, and kidney function in mice:

• The study examined the effect of several extracts on bleeding time and gastrointestinal transit in mice using the Duke test and charcoal meal method, respectively; results showed that V. mocanera extracts significantly inhibited both the bleeding time and gastrointestinal transit in mice.
• No diuretic activity of these extracts was detected; in contrast, they significantly reduced urine volume.
• The study provides experimental support to the therapeutic advocation of V. mocanera in ethnomedicine for the treatment of diarrhoea and the healing of wounds.

The inhibition of gastrointestinal transit provides a pharmacological rationale for the traditional use against diarrhoea, and the reduction in bleeding time supports the traditional wound-healing (hemostatic) use. However, these results are in rodents only, and specific extracts responsible and the doses used are not identified in the available published abstract.

Limitation: Animal study. Findings have not been replicated in human subjects. The anti-diuretic (rather than diuretic) renal effect noted contrasts with some folk applications in other traditions, underscoring the importance of evidence-based assessment.

4.5 Neuropharmacological / Psychostimulant and Anxiogenic Effects

Type of evidence: Animal (rodent) models

A 1995 neuropharmacological study by Hernández-Pérez, Sánchez-Mateo, Darias, and Rabanal, published in Phytotherapy Research (vol. 9, pp. 299–305), examined the behavioural effects of V. mocanera extracts in mice:

• Neuropharmacological studies were conducted in mice with different extracts from the leaves and fruits. The combined data suggest that the methanol extract from the leaves and the syrup from the fruits appear to have a psychostimulant action, since these extracts increased locomotor activity (the methanol extract at 250 mg/kg p.o.), reduced pentobarbital-induced sleeping time (methanol extract and syrup at 250 mg/kg p.o.), and produced hyperthermia (the syrup at 250 and 500 mg/kg p.o.).
• The aqueous fraction (250 and 500 mg/kg p.o.) and syrup (500 mg/kg p.o.) from fruits showed an anxiogenic-like profile in mice when evaluated acutely in the elevated plus-maze test.

The anxiogenic-like profile observed in the elevated plus-maze test — an increase in anxiety-related behaviour — is a notable safety-relevant finding from preclinical work that has been cited in the scientific literature.

Limitation: Animal study only. All doses are expressed per kg body weight in mice and cannot be extrapolated directly to human supplemental doses. No human clinical trials on the neuropharmacological effects of V. mocanera have been published.

5. Body Systems and Health Areas of Association

Based on the documented traditional uses and preclinical pharmacological literature, Visnea mocanera is associated with the following body systems and health areas. The evidence level for each is noted:

• Gastrointestinal system: Traditional use for diarrhoea and digestive complaints, with supporting preclinical (rodent) evidence for inhibition of gastrointestinal transit. Several ethnobotanical surveys from the Canary Islands document the use of mocán fruits for digestive complaints such as mild indigestion and stomach aches.
• Wound healing / skin: Traditional use as a cicatrizant and vulnerary agent, supported by in vitro antimicrobial and preclinical hemostatic evidence.
• Cardiovascular / hemostatic system: Preclinical evidence for reduction of bleeding time in rodents, attributable in part to the astringent and procyanidin content.
• Central nervous system / energy: Preclinical evidence for psychostimulant and anxiogenic effects in rodent behavioural models. A leaf extract has also been noted as an ingredient in at least one bodybuilding supplement product.
• Oxidative stress: In vitro antioxidant activity demonstrated for seed and fruit extracts, particularly attributable to flavan-3-ols and procyanidins.
• Nutritive / food use: Historical consumption as a food source, with the fruit containing procyanidins, catechins, polyphenols, and anthocyanins.

6. Dosage Forms and Dosages Reported in Studies

No established or clinically validated human dosage exists for Visnea mocanera. The only dose information in the peer-reviewed literature derives from rodent pharmacological studies:

• Methanol leaf extract (psychostimulant/locomotor effects): 250 mg/kg body weight administered orally (p.o.) in mice increased locomotor activity and reduced pentobarbital-induced sleeping time; fruit syrup at 250 mg/kg and 500 mg/kg p.o. also reduced sleeping time and produced hyperthermia.
• Aqueous fraction and syrup (anxiogenic profile): Aqueous fraction at 250 mg/kg and 500 mg/kg p.o., and fruit syrup at 500 mg/kg p.o., showed anxiogenic-like effects in the elevated plus-maze test in mice.
• Acetone leaf extract and fruit syrup (analgesic/anti-inflammatory): These preparations exerted central analgesic properties and anti-inflammatory effects; specific doses are not stated in the available abstract.

These rodent doses are expressed per kilogram of body weight in mice and are not directly convertible to human supplemental doses without allometric scaling, bioavailability data, and clinical safety studies.

7. Safety Considerations and Interactions

Preclinical Toxicology

Sub-acute toxicological experiments with various V. mocanera extracts indicated a very low toxicity in mice. This sub-acute finding from the 1994 rodent screening study is the primary published toxicological data point for the species.

The 1995 neuropharmacological study identified a potentially important safety signal: the aqueous fraction and the fruit syrup at doses of 250–500 mg/kg p.o. showed an anxiogenic-like profile in mice in the elevated plus-maze test. This means that at the doses producing stimulant-like effects, anxiety-related behaviour was also increased in the animal model. Whether this translates to anxiogenic effects in humans is unknown, but the finding is relevant to any consideration of safety in populations predisposed to anxiety disorders or in combination with other stimulants or anxiogenic substances.

Renal Effects

No diuretic activity of V. mocanera extracts was detected in rodents; in contrast, they significantly reduced urine volume. This anti-diuretic effect is a specific pharmacological observation that would warrant attention in any future safety evaluation, particularly in contexts where fluid balance and renal function are clinically relevant.

Absence of Ulcerogenic Activity

The extracts assayed in the 1994 rodent study did not display antipyretic or ulcerogenic activity, suggesting no gastric ulcer-producing tendency in the rodent models tested.

Absence of Human Clinical Data

There are no published human clinical trials, post-marketing surveillance reports, case series of adverse events, or pharmacokinetic studies for Visnea mocanera extracts in humans as of the date of this article. No regulatory authority (EMA, NIH/NCCIH, EFSA, WHO) has issued a formal monograph or safety opinion on this ingredient. The species is not listed in the German Commission E monographs, ESCOP monographs, or WHO monographs on medicinal plants.

Conservation Status and Supply Considerations

Visnea mocanera is noted as a rare Macaronesian endemic. The species grows from 200 to 1,000 metres altitude on Madeira and the Canary Islands, where it is found on all islands except Lanzarote but is extremely rare in Fuerteventura and uncommon in Gran Canaria. Its restricted geographical range and rarity raise potential concerns about the sustainability of wild harvesting for commercial ingredient supply, though no specific IUCN Red List threat category has been cited in the present search results for this species.

8. Current Research Landscape and Evidence Summary

The scientific literature on Visnea mocanera is limited in volume and confined almost entirely to a cluster of preclinical studies conducted by researchers at the Universidad de La Laguna (Tenerife, Spain) in the mid-1990s, primarily by Hernández-Pérez, Sánchez-Mateo, Darias, and Rabanal. The main published works identified include:

• Antimicrobial activity of leaf extracts (Journal of Ethnopharmacology, 1994)
• Pharmacological screening for analgesic, antipyretic, anti-inflammatory, and ulcerogenic effects (Phytotherapy Research, 1994)
• Gastrointestinal, hemostatic, and renal effects in rodents (Journal of Ethnopharmacology, 1995)
• Psychostimulant and anxiogenic behavioural effects in rodents (Phytotherapy Research, 1995)
• Phenolic composition of fruits (Journal of Agricultural and Food Chemistry, 1996)
• Phenolic composition and antioxidant activity of seeds (Food Chemistry, 2003)

No systematic reviews, meta-analyses, randomised controlled trials, observational cohort studies, or Phase I–III clinical trials have been identified for this ingredient. Evidence strength across all studied areas is therefore preliminary and preclinical. Findings from rodent experiments are hypothesis-generating and cannot be assumed to apply directly to human physiology, pharmacokinetics, or safety.

References

• Wikipedia — Visnea mocanera
• Plants of the World Online (Royal Botanic Gardens, Kew) — Visnea mocanera L.f.
• World Flora Online — Visnea mocanera
• EPPO Global Database — Visnea mocanera (VSNMO)
• GBIF — Visnea mocanera L.fil.
• Arbolapp Canarias — Visnea mocanera species profile
• Macaronesian.org — Mocán, mocanera (Visnea mocanera)
• PubMed — Hernández-Pérez M et al. "Antimicrobial activity of Visnea mocanera leaf extracts." Journal of Ethnopharmacology 41(1):115–119, 1994
• Wiley — Hernández-Pérez M et al. "Pharmacological properties of Visnea mocanera L.f. extracts: Screening for analgesic, antipyretic, antiinflammatory and ulcerogenic activities in rodents." Phytotherapy Research 8:465–469, 1994
• PubMed — Hernández-Pérez M et al. "Effects of Visnea mocanera extracts on the bleeding time, gastrointestinal transit and diuresis in rodents." Journal of Ethnopharmacology 46(2):95–100, 1995
• ScienceDirect — Hernández-Pérez M et al. "Effects of Visnea mocanera extracts on the bleeding time, gastrointestinal transit and diuresis in rodents." Journal of Ethnopharmacology, 1995
• ACS Publications — Hernández-Pérez M et al. "Phenolic Composition of the 'Mocán' (Visnea mocanera L.f.)." Journal of Agricultural and Food Chemistry 44(11):3512–3515, 1996
• ResearchGate — Dueñas M et al. "Phenolic composition and antioxidant activity of mocan seeds (Visnea mocanera L.f)." Food Chemistry 82(3):373–379, 2003
• Academia.edu — "Phenolic Composition of the 'Mocán' (Visnea mocanera L.f.)" (full text reference list)
• ScienceDirect — Vidal-Matutano P et al. "High-mountain plant use and management: macro-botanical data from pre-Hispanic sites of Chasogo and Cruz de Tea, 13–17th centuries AD, Tenerife (Canary Islands)." Journal of Archaeological Science: Reports, 2020
• ScienceDirect — Siddique HR, Saleem M. "Beneficial health effects of lupeol triterpene: A review of preclinical studies." Life Sciences 88(7–8):285–293, 2011