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Acacia / Gum Arabic (Senegalia senegal)
Materia Medica
Family: Fabaceae
Accepted botanical name: Senegalia senegal
Historical botanical name: Acacia senegal
Common names: Acacia, Gum Arabic, Gum Acacia, Senegal Gum, Sudan Gum, Kordofan Gum, Hashab
Part used: Dried gummy exudate from the bark
Growth habit: Drought-adapted shrub or small tree
Primary traditions: African gum trade, historical Western pharmacy, household herbalism, food and craft use
Actions & Energetics
Historical materia medica describes Gum Arabic as demulcent, soothing, mucilaginous, mildly nutritive, and protective to irritated mucous membranes. Its medicinal action is closely tied to the gum’s ability to form a smooth mucilage in water.
Botanical Description
Senegalia senegal is a low-branching shrub or small tree of dry tropical and subtropical regions. The bark is yellow-brown and relatively smooth on young growth, becoming darker, rougher, and cracked with age. Recurved prickles occur just below the nodes, commonly in pairs or groups of three. Leaves are bipinnate, with several pairs of pinnae carrying many small oblong leaflets. The fragrant flowers are white to cream and borne in narrow spikes. The pods are straight, flat, papery, and yellow-brown to brown at maturity.
Name & Taxonomy
The medicinal and commercial gum was long listed under the botanical name Acacia senegal. Current classification places the species in Senegalia as Senegalia senegal. Historical herbals, dispensatories, pharmacopoeias, and trade records commonly use the older name.
What Gum Arabic Is
Gum Arabic is the dried exudate that forms on the bark after natural injury or controlled tapping. Fresh exudate hardens into translucent white, pale yellow, amber, or golden tears and irregular fragments. The dried gum is nearly odorless, bland to mildly mucilaginous in taste, readily disperses or dissolves in water, and is insoluble in alcohol.
Traditional Indications
Western dispensatories and materia medica texts used Acacia mucilage as a soothing preparation for irritated mouth and throat tissues, coughs, hoarseness, pharyngeal irritation, gastric irritation, diarrhea, dysentery, and urinary burning. It also served as a vehicle for powders, oils, resins, and other medicines because its mucilage suspends and emulsifies ingredients effectively.
Preparations & Dosage
Mucilage of Acacia — Historical Official Preparation
Formula: 350 g Acacia gum with distilled water to make 1000 g of mucilage.
Historical dose: 1–4 fluidrachms, approximately 3.7–15 mL, or more according to the preparation.
Syrup of Acacia — Historical Official Preparation
Formula: 100 g Acacia gum, 800 g sugar, and distilled water to make 1000 mL.
Historical dose: 1–4 fluidrachms, approximately 3.7–15 mL.
Felter’s Acacia Water Preparation
Formula: ½ ounce Gum Arabic dissolved in 5 fluidounces water, sweetened with sugar.
Historical use: Given in tablespoonful doses occasionally as a soothing and mildly nutritive mucilage.
Simple Gum Solution
Historical pharmacy commonly prepared Gum Arabic in water as a smooth mucilage for demulcent use and as a vehicle for suspended powders and emulsified oils or resins.
Modern Human Study Doses
- 10 g/day has been used in adult gastrointestinal and microbiome research.
- 30 g/day has been used in adult studies for periods of several weeks.
- 40 g/day has been studied in healthy adults for approximately four weeks.
Historical Pharmacy Uses
Gum Arabic was a standard pharmaceutical excipient as well as a materia medica drug. Pharmacists used it to emulsify oils and resins, suspend insoluble powders, bind pills and lozenges, thicken mixtures, and prepare medicinal syrups and mucilages.
Constituents
Gum Arabic is composed chiefly of highly branched polysaccharides and arabinogalactan-protein complexes. Its carbohydrate components include arabinose, galactose, rhamnose, and glucuronic-acid-containing fractions, along with naturally occurring mineral salts. Older materia medica commonly referred to its principal gum fraction as arabin.
Modern Research
Modern human research has focused largely on Gum Arabic as a soluble fermentable fiber. Studies have examined stool characteristics, intestinal fermentation, gut microbial populations, satiety, blood lipids, glucose-related measures, and other metabolic outcomes. Human studies have used amounts ranging from approximately 10–40 g daily, depending on the study design.
Adverse Effects
The most commonly reported effect at larger oral amounts is flatulence, with bloating or gastrointestinal fullness also reported in some users. Adult studies using up to 30 g/day for short periods and up to 40 g/day for approximately four weeks reported good overall tolerance. Serious adverse effects have not been shown.
Habitat & Cultivation
- Native range: Tropical and southern Africa eastward into parts of Arabia and the Indian subcontinent
- Habitat: Desert margins, dry shrubland, savanna, thorn scrub, and semi-arid grassland
- Light: Full sun
- Soil: Freely draining dryland soils
- Rainfall: Productive gum-growing regions can receive only about 250–300 mm of annual rainfall
- Rooting: Deep taproots may develop where groundwater lies far below the surface
Propagation
Propagation is primarily by seed. The hard seed coat can create physical dormancy, and dryland nurseries commonly use scarification or soaking methods to improve germination before establishment.
Gum Harvesting
Commercial gum is obtained from mature trees by controlled tapping of the bark during the dry season. The exudate emerges, hardens in the dry air, and is collected as gum tears. Trees can begin producing commercial gum within several years of establishment, with mature trees providing the strongest yields. The gum is cleaned, sorted, and sold as tears, granules, or powder.
Food & Household Uses
Food-grade Gum Arabic is widely used as a soluble fiber, emulsifier, stabilizer, binder, coating agent, and crystallization-control ingredient. It appears in confectionery, beverages, flavor emulsions, bakery products, glazes, and other foods.
Ink, Paint & Craft Use
Gum Arabic has a long history as a binder in ink, watercolor, pigment preparations, paper work, and other crafts. Its ability to form a clear water-soluble film made it valuable wherever pigment or fine particles needed to remain suspended and adhere to a surface.
History & Cultural Use
Gum Arabic has been traded and used for thousands of years. Ancient Egyptian records and surviving materials show gum use in food, medicine, cosmetics, craft work, and carbon-based inks. African producing regions later became central to the international Gum Arabic trade, especially the Sudanese gum belt and neighboring dryland areas.
Materia Medica Summary
Acacia / Gum Arabic (Senegalia senegal) is the dried bark exudate of a drought-adapted African and Asian dryland tree. Historical materia medica used the gum chiefly as a demulcent and soothing mucilage for irritated mucous membranes and as a pharmacy vehicle for powders, oils, resins, syrups, pills, and lozenges. Official historical preparations included Mucilage of Acacia and Syrup of Acacia, commonly given in doses of 1–4 fluidrachms. Modern research focuses on its role as a soluble fermentable fiber, with adult study amounts commonly ranging from 10–40 g/day.