Diospyros lotus (Date Plum)

Diospyros lotus, commonly called Date Plum, is a small wild fruit containing phenolic compounds such as gallic acid and flavonoids that exhibit free radical scavenging activity in laboratory models. Its primary studied mechanism involves inhibition of oxidative stress through electron donation to reactive oxygen species, though no human clinical trials have confirmed these effects.

Origin & History

Diospyros lotus, commonly known as date plum or Caucasian persimmon, is a deciduous tree native to Southwest Asia and parts of Europe, including the Caucasus, Turkey, and Iran. The edible fruit serves as the primary source for phenolic compound extraction, typically using water, methanol, or acetone solvents, with water yielding the highest total phenolic content at 14.5 mg gallic acid equivalents per gram of dry powder.

Historical & Cultural Context

The research sources provide no documentation of historical or traditional medicinal uses of Diospyros lotus. References are limited to modern phytochemical analyses without any ethnobotanical or traditional medicine context.

Health Benefits

• Antioxidant activity demonstrated only in laboratory studies (in vitro DPPH radical scavenging assays) - no human evidence available
• Contains phenolic compounds including gallic acid (up to 287.5 μg/g in water extracts) - potential health effects unverified in humans
• May provide ferric ion reducing capacity based on laboratory assays - clinical relevance unknown
• Contains flavonoids like myricetin (2.75-5.28 μg/g) - human health benefits not studied
• No clinical evidence exists for any health benefits in humans

How It Works

Gallic acid and other hydrolyzable tannins isolated from Diospyros lotus donate hydrogen atoms to neutralize DPPH and ABTS free radicals, measured by reductions in radical absorbance in vitro. Phenolic hydroxyl groups chelate ferric ions (Fe³⁺), reducing them to ferrous form (Fe²⁺) in FRAP assays, which may limit iron-catalyzed Fenton reactions that generate hydroxyl radicals. Flavonoid aglycones present in the fruit may also inhibit pro-inflammatory enzymes such as COX-2 and lipoxygenase through competitive binding, though this has not been confirmed in animal or human studies.

Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses were identified for Diospyros lotus. Research is limited exclusively to in vitro antioxidant activity assessments and phytochemical analyses, with no PubMed-indexed clinical studies available.

Clinical Summary

All available evidence for Diospyros lotus comes from in vitro laboratory assays; no randomized controlled trials or human observational studies have been published as of 2024. Water extracts of the fruit demonstrated gallic acid concentrations up to 287.5 μg/g and measurable DPPH radical scavenging activity in test-tube models. Some phytochemical analyses have characterized the fruit's tannin and flavonoid profiles in Serbian and Turkish wild populations, but these studies report chemical composition only, not health outcomes. The overall evidence base is preliminary and insufficient to support any clinical health claim.

Nutritional Profile

Diospyros lotus (Date Plum) is a small wild fruit with moderate caloric density. Macronutrients per 100g fresh weight (approximate): carbohydrates 18-25g (primarily simple sugars including glucose and fructose, with sucrose in smaller fractions), dietary fiber 3-5g (mix of soluble and insoluble fractions), protein 0.8-1.5g, fat 0.2-0.5g. Moisture content approximately 70-80% in fresh fruit, dropping significantly in dried form which concentrates sugars and phenolics. Micronutrients: vitamin C present at modest levels (estimated 5-15mg/100g, lower than closely related D. kaki/persimmon), potassium is the dominant mineral (~200-300mg/100g estimated), with smaller contributions from calcium, magnesium, and phosphorus; iron content low (<1mg/100g). Bioactive compounds: total phenolic content measured at 287.5 μg gallic acid equivalents per gram in aqueous extracts; gallic acid is the primary identified phenolic; flavonoids including quercetin and kaempferol derivatives detected qualitatively in published phytochemical screenings; tannins (hydrolyzable type) present and responsible for astringency in unripe fruit - tannin content decreases substantially upon ripening/bletting. Carotenoids present at low levels contributing to orange-yellow coloration. Bioavailability notes: phenolic bioavailability likely moderate and matrix-dependent; tannins in unripe fruit may reduce protein and mineral absorption; bletting (post-harvest softening) significantly reduces tannin content and improves palatability and likely nutrient accessibility. Most compositional data derive from wild-collected Eastern European and Central Asian specimens with notable variation by genotype and ripeness stage.

Preparation & Dosage

No clinically studied dosage ranges exist as no human trials have been conducted. Laboratory extraction methods use dry fruit powder with various solvents, but no standardized forms or therapeutic doses have been established. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Other antioxidant-rich fruits, vitamin C, vitamin E, polyphenol supplements, quercetin

Safety & Interactions

No formal human safety studies, toxicology trials, or established tolerable upper intake levels exist for Diospyros lotus fruit or its extracts. The high tannin content found in unripe fruit could theoretically inhibit dietary iron and protein absorption if consumed in large quantities, a concern shared with other tannin-rich foods. Individuals taking anticoagulants such as warfarin should use caution, as gallic acid has demonstrated antiplatelet activity in isolated cell studies, though clinically significant interactions have not been documented. Pregnant and breastfeeding women should avoid concentrated extracts due to a complete absence of safety data in these populations.