Jambos
StarSyzygium jambos
Synonyms: Syzygium monanthum, Plinia jambos, Syzygium jambos var. linearilimbum, Eugenia monantha, Jambosa jambos, Eugenia jambos, Eugenia jambosa, Eugenia malaccensis f. cericarpa, Eugenia jamboides, Jambosa palembanica, Jambosa malaccensis f. cericarpa, Jambosa leptostachya, Myrtus jambos, Syzygium leptostachyum, Eugenia vulgaris, Jambosa vulgaris
Western Herbalism Properties
Traditional Uses
In Caribbean and Central American folk and Garifuna medicine, decoctions of Syzygium jambos leaves and bark are used for fevers, diarrhoea, and to lower blood sugar in diabetes, and the seeds are taken in powdered form for chronic diarrhoea (Coe and Anderson, 1996; Morton, 1981).
Gallery
Botanical Description
Syzygium jambos, commonly known as rose apple, malabar plum or jambu, is a small to medium-sized evergreen tree in the family Myrtaceae native to Southeast Asia (probably Malesia and the Indo-Burma region) and now widely cultivated and naturalised throughout the tropics, including much of the Caribbean, tropical America, Africa and the Pacific islands. Mature trees reach 7 to 12 metres in height, occasionally to 18 metres, with a dense, low-branching, spreading crown and brown, finely flaking bark. The opposite leaves are simple, narrowly lanceolate to elliptic-lanceolate, 10 to 22 centimetres long and 2.5 to 5 centimetres wide, glossy dark green above and paler beneath, with an entire, slightly wavy margin and a long-tapering acuminate tip; young foliage flushes a striking pinkish-red. Showy flowers are borne in terminal corymbose cymes of four to five blossoms, each 5 to 10 centimetres across and dominated by a hemispherical brush of 200 to 400 long greenish-white to creamy-yellow stamens. The fruit is a roughly globose to ovoid yellowish-white or pale rose-tinted berry 3 to 5 centimetres long with crisp, rose-scented, somewhat hollow flesh enclosing one to two large brown seeds.
Active Constituents
Quercetin and myricetin (flavonols)
FlavonoidConcentration: Among the most abundant flavonols in leaf extracts, often as glycosides
Potent antioxidant flavonols that scavenge free radicals and contribute to the reported anti-inflammatory, hepatoprotective and vascular-protective activities of the leaf.
Ellagitannins (castalagin, vescalagin, casuarinin)
Hydrolysable tanninConcentration: Major polyphenols of leaf and bark
High-molecular-weight tannins with strong antioxidant, astringent and antimicrobial activity; underlie the traditional use of the astringent leaf and bark decoctions.
Ellagic acid and gallic acid
Phenolic acidConcentration: Common phenolic-acid constituents
Antioxidant and anti-inflammatory phenolic acids that also contribute reported anticancer and hepatoprotective effects in experimental models.
Betulinic acid, friedelin, oleanolic and ursolic acids
Pentacyclic triterpenoidConcentration: Present in leaf and bark
Triterpenoids with anti-inflammatory, antimicrobial and cytotoxic activities documented in vitro.
Jambones (phloroglucinol derivatives)
AcylphloroglucinolConcentration: Characteristic compounds isolated from the fruit tree
Novel phloroglucinol derivatives reported to show cytotoxic and antioxidant activity in isolation studies of the species.
Essential oil (linalool, geraniol, beta-caryophyllene, delta-cadinene)
Volatile terpenoidConcentration: Aromatic fraction of leaves and flowers
Volatile mono- and sesquiterpenes contributing the fragrant, rose-like aroma and some of the antimicrobial activity of the leaf oil.
Anthocyanins (cyanidin, pelargonidin glycosides)
Anthocyanin (flavonoid)Concentration: In pigmented fruit
Water-soluble pigments with antioxidant activity contributing to the colour and nutritional value of the ripe fruit.
⚠ Drug Interactions
Antidiabetic agents (insulin, sulfonylureas, metformin)
Leaf extracts have shown blood-glucose-lowering and alpha-glucosidase-inhibitory activity in animal and in vitro models; concurrent use with hypoglycaemic drugs could in theory add to their effect.
Clinical note: No human interaction reports exist; monitor blood glucose if a diabetic patient consumes concentrated leaf preparations alongside glucose-lowering medication.
Preparation Methods
Leaf/bark decoction (astringent)
Parts: Leaf, Bark
Dried leaves or bark are simmered in water to make an astringent decoction used traditionally as a gargle for sore throat, a wash, and internally in small amounts for diarrhoea. The high tannin content makes strong or prolonged internal use inadvisable.
Fruit (fresh, edible)
Parts: Fruit
The crisp, fragrant rose apple is eaten fresh or made into preserves and drinks; it is a mild, edible food use with no special preparation required.
Leaf infusion / poultice
Parts: Leaf
An infusion of the leaves is used in folk practice as a tonic and, applied topically as a poultice or wash, for skin complaints. Preparations are not standardised and should be regarded as traditional rather than clinically validated.
Historical Texts
Ayurvedic and South/Southeast Asian folk medicine
Traditional (pre-modern to present)Caribbean and Latin American ethnobotany
Colonial to modern eraReferences
- Ochieng MA, Ben Bakrim W, Bitchagno GTM, Mahmoud MF, Sobeh M. Syzygium jambos L. Alston: An Insight Into its Phytochemistry, Traditional Uses, and Pharmacological Properties . Frontiers in Pharmacology (2022) [DOI]
- Sobeh M, Mahmoud MF, Petruk G, et al.. Phenolic compounds from Syzygium jambos (Myrtaceae) exhibit distinct antioxidant and hepatoprotective activities in vivo . Journal of Functional Foods (2018) [DOI]
- Zhang YL, et al.. New Phloroglucinol Derivatives from the Fruit Tree Syzygium jambos and Their Cytotoxic and Antioxidant Activities . Journal of Agricultural and Food Chemistry (2015) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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