Solanum dulcamara

Solanum dulcamara, commonly called bittersweet nightshade, contains steroidal alkaloids such as solanine and solasonine alongside phenolic compounds that drive its antioxidant activity. These constituents neutralize free radicals primarily through electron donation and hydrogen atom transfer mechanisms, as demonstrated in controlled in vitro assays.

Origin & History

Solanum dulcamara L. (bittersweet) is a climbing woody vine native to Europe and western Asia, belonging to the Solanaceae (nightshade) family. The plant's fruits, leaves, and stems contain bioactive compounds that are extracted using various methods including methanol and water-based extraction, with primary chemical classes consisting of steroidal alkaloids (particularly solamargine and solasonine) and phenolic compounds.

Historical & Cultural Context

The research dossier does not contain information about the historical or traditional use of Solanum dulcamara in traditional medicine systems. No documentation was provided regarding conditions it was traditionally used to treat or the duration of its traditional use.

Health Benefits

• Antioxidant activity through radical scavenging mechanisms (preliminary evidence from in vitro studies)
• DPPH radical scavenging capacity demonstrated in experimental systems (preliminary evidence)
• Hydroxyl radical (•OH) scavenging activity shown using electron paramagnetic resonance methodology (preliminary evidence)
• Potential antibacterial activity of alkaloids (referenced but no detailed evidence provided)
• Note: No human clinical trials were provided in the research dossier

How It Works

The steroidal glycoalkaloids and polyphenolic constituents in Solanum dulcamara donate hydrogen atoms or single electrons to unstable free radicals, quenching DPPH radicals and hydroxyl radicals (•OH) detected via electron paramagnetic resonance (EPR) spectroscopy. Phenolic acids and flavonoids in the plant chelate transition metal ions such as Fe²⁺ and Cu²⁺, suppressing Fenton-type reactions that generate •OH. These combined mechanisms reduce oxidative stress in cell-free systems, though receptor-level or enzyme-specific targets in human tissue remain uncharacterized.

Scientific Research

The available research consists primarily of in vitro antioxidant studies using electron paramagnetic resonance (EPR) methodology to assess radical scavenging capacity. No human clinical trials, randomized controlled trials (RCTs), or meta-analyses with PubMed PMIDs were provided in the research dossier. One reference mentions alkaloids being screened for antibacterial activity in human studies, but no trial details, sample sizes, or specific outcomes were included.

Clinical Summary

Available evidence for Solanum dulcamara's antioxidant activity is limited exclusively to in vitro and cell-free experimental systems; no published randomized controlled trials or human clinical studies have evaluated its efficacy or pharmacokinetics. DPPH radical scavenging capacity has been quantified in extract-based assays, and EPR methodology has confirmed hydroxyl radical neutralization under controlled laboratory conditions. Effect magnitudes vary considerably by extraction solvent and plant part tested, making cross-study comparisons unreliable. The German Commission E has historically acknowledged the plant's traditional use, but the commission's monograph reflects insufficient clinical evidence to support therapeutic claims.

Nutritional Profile

Solanum dulcamara (Bittersweet Nightshade) contains limited macronutrient data due to its non-food status (toxic plant, not consumed as food). Bioactive compounds dominate its chemical profile: Steroidal alkaloids are primary constituents, including solanine (0.1–0.6% dry weight in berries and stems), solanidine, solasonine, and solamargine — the latter two being glycoalkaloids with demonstrated bioactivity. Steroidal saponins including diosgenin-based glycosides are present in aerial parts. Polyphenolic compounds include chlorogenic acid, caffeic acid derivatives, rutin, and quercetin glycosides, which are the primary contributors to the documented DPPH and hydroxyl radical scavenging activity. Alkaloid content varies by plant part: unripe green berries contain the highest solanine concentrations (potentially toxic thresholds >200 mg/kg fresh weight); ripe red berries contain reduced but still significant levels. The stems contain solacauline and related steroidal alkaloids. Tomatine analogues are also reported. Carotenoids (including beta-carotene and lycopene precursors) are present in ripe berries at trace levels. Fiber content of berries is estimated at 1–2% fresh weight but is not nutritionally relevant given toxicity concerns. Bioavailability note: Glycoalkaloids have poor oral bioavailability due to poor GI absorption but exert local mucosal effects; polyphenols from extracts show moderate in vitro availability. This plant is not approved for dietary use; all data derives from phytochemical and pharmacognostic analyses.

Preparation & Dosage

No clinically studied dosage ranges for Solanum dulcamara were provided in the research. While manufacturing specifications describe water-soluble extracts with 60-95% solamargine and solasonine concentrations, these do not represent clinical dosing recommendations. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Other antioxidants, vitamin C, vitamin E, selenium, grape seed extract

Safety & Interactions

Solanum dulcamara contains solanine and related glycoalkaloids that are toxic in sufficient quantities, causing nausea, vomiting, bradycardia, and central nervous system depression even at moderate doses from raw plant material. The German Commission E issued a negative monograph for internal therapeutic use, citing unproven efficacy and potential toxicity risk. Drug interactions are poorly studied, but alkaloid content theoretically warrants caution with anticholinergic medications, CNS depressants, and antiarrhythmic agents. The plant is contraindicated during pregnancy and breastfeeding and should not be self-administered without medical supervision due to its narrow margin between traditional use amounts and toxic doses.