Overview
Cornus seed is harvested from Cornus officinalis, a plant belonging to the dogwood family (Cornaceae). In traditional East Asian medicine systems, the fruit (Shanzhuyu) and seeds have been used for over 2,000 years, primarily as a kidney yang tonic and anti-inflammatory agent. The seeds contain bioactive compounds like iridoid glycosides, organic acids, and polysaccharides. Modern research suggests potential benefits for diabetes management and neuroprotection, though clinical evidence remains preliminary. Beyond medicinal applications, the seeds propagate ornamental shrubs widely used in temperate-climate landscaping.
Key Features
Botanically, the seeds exhibit a distinctive elongated oval shape with a bony endocarp that requires scarification or prolonged cold stratification (90-120 days at 4°C) to break dormancy. The seed coat's hardness contributes to long-term viability—properly stored seeds maintain germination rates for 3-5 years. Chemically, the seeds share many active constituents with the fruit pulp, including morroniside (a marker compound for quality control) and sweroside. However, seed extracts typically show higher concentrations of certain iridoids but lower levels of fruit-derived antioxidants like ursolic acid.
Application Areas
In traditional Chinese medicine (TCM), processed seeds appear in formulas like Liuwei Dihuang Wan for kidney deficiency syndromes. Licensed TCM manufacturers typically use ethanol/water extracts standardized to ≥1.5% total iridoids. Horticulturally, the seeds produce drought-resistant shrubs favored in ecological landscaping projects. European and North American nurseries increasingly source seeds for ornamental cultivars with improved flowering displays. Emerging applications include functional food additives, though regulatory approvals vary by jurisdiction.
Precautions
Medicinal applications require professional guidance due to potential interactions with anticoagulants and hypotensive drugs. The European Medicines Agency classifies Cornus fruit preparations as traditional herbal medicinal products (THMP) with restricted indications. For cultivation, seeds must undergo stratification mimicking winter conditions. Direct sowing without pretreatment yields <10% germination. International shipments require phytosanitary certificates to prevent transfer of plant pathogens like anthracnose fungi (Colletotrichum spp.).
B2B Procurement Guide
Pharmaceutical buyers should request HPLC analysis certificates verifying iridoid content (minimum 1.2% morroniside) and heavy metal compliance (Pb<5ppm, Cd<0.3ppm). Reputable suppliers provide seed lot numbers with traceability to cultivation regions—Shaanxi and Henan provinces produce highest-grade material. For landscaping use, inquire about germination test dates (within 12 months) and purity (>98% seed content). Bulk orders (50kg+) typically qualify for 15-20% discounts. Seasonal availability peaks October-December post-harvest; advance contracts recommended due to fluctuating yields.
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