Overview
Burdock Seed, known as Niubangzi in Chinese medicine, is the dried ripe fruit of Arctium lappa, a biennial plant native to Asia and Europe. It has been used for centuries in Traditional Chinese Medicine (TCM) for its 'heat-clearing' and detoxification properties. Modern research confirms its bioactive compounds, including arctiin and chlorogenic acid, contribute to anti-inflammatory and antioxidant effects. In TCM theory, it belongs to the 'surface-resolving' herb category, often prescribed for wind-heat symptoms like fever or cough. The seeds are typically harvested in autumn, dried, and processed by stir-frying to enhance efficacy. Their use spans both herbal decoctions and commercial extract production.
Physical and Chemical Properties
Burdock Seed contains 15–20% fatty oils (primarily linoleic acid) and 2–5% lignans, with arctiin being the primary active constituent. The seeds exhibit hygroscopicity due to their polysaccharide content, requiring careful storage to prevent mold. When crushed, they release a faint aromatic odor and slightly bitter taste. Analytical methods like HPLC are used to quantify marker compounds (e.g., arctiin ≥2.0% per Chinese Pharmacopoeia standards). The water-soluble fractions demonstrate notable free radical scavenging activity in vitro, supporting its traditional use for oxidative stress-related conditions.
Main Applications
In clinical TCM, Burdock Seed is a key ingredient in formulas like 'Yinqiao San' for respiratory infections. It’s also used topically in poultices for skin inflammations. Modern applications include: 1. **Pharmaceuticals**: As raw material for anti-inflammatory capsules or throat lozenges. 2. **Nutraceuticals**: Incorporated into detox teas or supplements for liver support. 3. **Cosmeceuticals**: Oil extracts are used in anti-acne formulations due to antimicrobial effects against Propionibacterium acnes.
Safety and Storage
Burdock Seed is classified as non-toxic in TCM, with LD50 >15g/kg in rodent studies. Rare cases of contact dermatitis have been reported in hypersensitive individuals. Proper storage is critical to maintain potency: vacuum-sealed bags with desiccants are recommended for bulk quantities to prevent rancidity of fatty acids. Quality degradation indicators include visible mold, insect damage, or loss of characteristic bitter taste. Sterilization methods like ethylene oxide fumigation must comply with herbal medicine safety regulations.
B2B Procurement Guide
For commercial buyers, prioritize suppliers with: - **Certification**: GAP (Good Agricultural Practice) or organic certification for raw materials. - **Testing Reports**: Heavy metals (Pb <5ppm, As <2ppm), aflatoxins (<5μg/kg), and pesticide residues (meeting EU/China herbal standards). - **Processing**: Steam-sterilized or irradiated batches for microbial control. Spot-check arctiin content via third-party labs. For extract procurement, specify solvent type (e.g., 70% ethanol for lignan-rich extracts) and standardization levels (e.g., 10:1 concentrate, 5% arctiin).
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