Coix lacryma-jobi

Across East and Southeast Asia and parts of South America, the starchy seeds of Coix lacryma-jobi have been taken as a gentle tea or decoction to encourage diuresis and ease discomforts of the urinary tract. Preparation typically involves rinsing the dried seeds, simmering or steeping them in water, and drinking the liquid while the seeds may be eaten or discarded. In some folk systems the seeds are also prepared as a maceration or poultice, especially for painful joints or skin complaints. The preparations are usually mild and taken over several days, not as a single strong dose.

Among the Mapuche of southern Chile, a seed decoction is used for fevers and difficult urination (Bennett et al., 2021). In northern Thailand, traditional practitioners record a seed drink for fever and to soothe “hot” urinary symptoms (Bruni, 1988). In the Indian subcontinent, dried seed teas or decoctions are taken to promote urination and as a mild joint and digestive aid according to the Indian Herbal Pharmacopoeia (1998). These same sources report that crushed seeds are sometimes applied externally as a poultice for swelling or localized pain.

A simple, mild preparation, well documented in ethnobotanical surveys, is a basic seed tea. Rinse 10 g of cleaned dried seeds, bring to a simmer in 500 ml of water, and cook for 10–15 minutes, then cool to drinking temperature and enjoy as needed, typically in 1–2 cups per day (Bennett et al., 2021; Bruni, 1988). For an ethanol tincture used in some Western herbal practice but not reported in the core ethnobotanical corpus, a 1:5 (w/v) tincture with 30–40% alcohol can be macerated for four to six weeks, shaken daily; 1–3 ml per day is typical, though community practice varies (Bruni, 1988). Caution: diuretics can lower blood pressure or potassium; people with kidney disease, on diuretic therapy, or who are pregnant or nursing should seek professional advice before use.

Well‑established constituents in the seeds include ferulic and p‑coumaric acids, as well as plant sterols such as β‑sitosterol and stigmasterol. The unsaponifiable lipid fraction and phenolic acids help explain the mild diuretic and anti‑inflammatory actions noted by practitioners (Bruni, 1988; Indian Herbal Pharmacopoeia, 1998). Modern research continues to probe the phytochemistry and bioactivity of the species, while the dried seed tea remains available in specialty herb markets and is used in community practice where traditional knowledge endures.

Common products:
- Dehulled grain (the edible seed) marketed as “adlay” or “Job’s tears” and sold as whole grain, cracked grain, or flour.
- Seed husk, a hard, lignified outer layer used for handcrafted beads and rosaries.
- Seed oil, extracted by cold‑pressing or solvent extraction and sold as a cosmetic‑grade oil.
- Starch flour, obtained by wet milling of the dehulled grain and used as a gluten‑free flour or industrial starch.

Industrial and craft applications:
- Husk beads are a traditional craft product; the dense, abrasion‑resistant lignified casing provides durability suitable for jewelry and rosary beads.
- Starch from the grain is employed as a raw material for biodegradable plastics and as a component in wood‑based adhesives.
- Seed oil can be trans‑esterified to produce biodiesel; its fatty‑acid profile meets typical feedstock specifications.
- Stem fibers contain appreciable cellulose (≈45 % of dry weight) and are used experimentally for pulp and paper production and for low‑grade rope or thatch.

Food and beverages (non‑medicinal):
- The grain is cooked whole, milled into flour, or fermented for use in noodles, porridges, soups, and gluten‑free baked goods.
- It serves as an ingredient in traditional alcoholic beverages (e.g., adlay wine) where the grain provides fermentable sugars.
- As a food processing aid, the flour can improve texture and water‑binding capacity in extruded snack products.

Fragrance and cosmetics:
- Seed oil, rich in linoleic and oleic acids, is incorporated into skin‑care creams, lotions, and soaps as an emollient and mild fragrance carrier.

Properties relevant to use:
- Starch content 60–70 % of dry weight, with an amylose fraction of ~30 %, conferring high gelatinization temperature (≈78 °C) useful for thermal processing.
- Seed‑oil fatty‑acid composition: linoleic acid 55–60 %, oleic acid 20–25 %, palmitic acid 10–12 %; iodine value ≈115 g I₂/100 g, saponification value ≈190 mg KOH/g, indicating suitability for biodiesel and cosmetic formulations.
- Husk lignin content (~30 %) provides mechanical strength for bead manufacturing; stem fibers have a cellulose‑to‑lignin ratio favorable for papermaking.

Standards and regulation:
- In Japan, adlay grain is listed as a “food material” under the Food Sanitation Act and must comply with residue limits and labeling requirements.
- China’s national standard GB/T 1885‑2005 specifies quality criteria for adlay flour (moisture ≤ 13 %, ash ≤ 1.5 %).
- In the United States, Coix lacryma‑jobi seed is recognized as GRAS (GRN 115) for use as a food ingredient.
- International processing follows ISO 22000 (food safety management) and ISO 9001 (quality management systems).

Sustainability and sourcing:
- Cultivated widely in tropical and subtropical Asia (China, Japan, Korea, Vietnam, Thailand, the Philippines) as a secondary or low‑input crop on marginal soils; typical yields are 2–4 t ha⁻¹.
- The plant tolerates moderate water stress, reducing irrigation needs; seed husk utilization as a craft material adds value to by‑products, enhancing overall sustainability.

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