I. Overview
1. Plant Source
Artichoke (Cynara scolymus L.), also known as globe artichoke, cardoon, or French artichoke, is a perennial herb belonging to the Asteraceae family. Its extracts are primarily derived from flower buds and leaves, rich in various bioactive compounds.
2. Chemical Composition
Key active ingredients in artichoke extract include:
- Phenolic acids: E.g., cynarin, chlorogenic acid, with antioxidant, anti-inflammatory, and lipid-regulating properties.
- Flavonoids: E.g., luteolin, apigenin, which enhance vascular elasticity and improve microcirculation.
- Sesquiterpene lactones: E.g., cynaropicrin, exhibiting hepatoprotective, choleretic, and antibacterial activities.
- Polysaccharides: E.g., inulin, which modulates gut microbiota and aids digestion.
3. Extraction Processes
Common methods include:
- Aqueous extraction: Suitable for polysaccharides and phenolic acids, but requires temperature control to prevent thermolabile compound degradation.
- Organic solvent extraction: E.g., ethanol reflux, enhancing yields of flavonoids and sesquiterpene lactones.
- Supercritical fluid extraction: Using CO₂ as a solvent, it efficiently retains volatile components and is ideal for high-purity extraction.
- Enzyme-assisted extraction: Combining cellulase and pectinase breaks down cell walls, improving extractability.
II. Applications
1. Pharmaceuticals
- Hepatoprotective effects: Promotes bile secretion and inhibits lipid peroxidation, mitigating liver damage from alcohol or drugs.
- Lipid-lowering and antihypertensive effects: Inhibits cholesterol synthase, reducing serum total cholesterol (TC) and low-density lipoprotein cholesterol (LDL-C).
- Anti-inflammatory and analgesic effects: Suppresses cyclooxygenase (COX) activity, alleviating inflammatory conditions like arthritis and gastritis.
- Antidiabetic effects: Improves insulin resistance and glucose uptake.
2. Food and Dietary Supplements
- Functional foods: Acts as a natural antioxidant and lipid regulator in beverages, dairy products, and baked goods.
- Dietary supplements: Formulated into capsules or tablets for lipid regulation and liver health.
- Flavorings: Enhances food taste with its unique flavor profile.
3. Cosmetics
- Antioxidant skincare: Scavenges free radicals to delay aging and reduce wrinkles and pigmentation.
- Anti-inflammatory and repairing effects: Alleviates skin inflammation (e.g., acne, eczema) and promotes wound healing.
- Moisturizing and whitening effects: Strengthens the stratum corneum barrier and improves skin luminosity.
4. Other Fields
- Feed additives: Enhances animal immunity and growth performance.
- Agriculture: Acts as a biopesticide against plant diseases.
- Fragrances: Extracted volatile oils are used in perfumes and soaps.
III. Mechanisms of Action
1. Antioxidant effects
Phenolic hydroxyl groups in phenolic acids and flavonoids directly scavenge free radicals (e.g., DPPH, ABTS⁺) or chelate metal ions to inhibit lipid peroxidation.
2. Lipid metabolism regulation
Cynarin inhibits HMG-CoA reductase, reducing cholesterol synthesis, while activating LDL receptors to promote cholesterol clearance.
3. Anti-inflammatory effects
Suppresses the NF-κB signaling pathway, decreasing pro-inflammatory cytokines (e.g., TNF-α, IL-6).
4. Hepatoprotective effects
Promotes hepatocyte regeneration, enhances glutathione (GSH) synthesis, and alleviates toxin-induced liver injury (e.g., CCl₄).
