Walnut Oil (Juglans Regia)

Walnut Oil (Juglans Regia)
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Walnut oil is a premium edible oil extracted from the kernels of the walnut tree (Juglans regia), a deciduous species native to temperate regions and known for its rich, nutty flavor and health-promoting properties. The oil is typically golden and clear, with a characteristic nutty and woody aroma.

Extraction Methods

Walnut oil is commonly obtained through:

• Cold Pressing: Preserves the oil’s delicate flavor, nutritional profile, and bioactive compounds. Cold-pressed walnut oil is considered the highest quality, with low acidity and high antioxidant content23.

• Hydraulic Pressing: Often used with roasted kernels to enhance the nutty aroma.

• Solvent Extraction (e.g., Soxhlet, Ultrasonic): Yields more oil but may alter the sensory and nutritional qualities234.

Physical and Chemical Properties

Chemical Composition

Walnut oil is rich in unsaturated fatty acids and bioactive compounds:

• Polyunsaturated fatty acids:

  • Linoleic acid (omega-6): ~58–62%

  • Alpha-linolenic acid (omega-3): ~14%

• Monounsaturated fatty acids:

  • Oleic acid (omega-9): ~13%

• Saturated fatty acids:

  • Palmitic, stearic, lauric, myristic, arachidic, behenic acids (minor amounts)

• Phytosterols: β-sitosterol (dominant), campesterol, stigmasterol

• Tocopherols: High in γ-tocopherol (vitamin E)

• Phenolic Compounds: Ellagic acid, tannins, flavonoids

• Other Nutrients: Squalene, melatonin, vitamins, and minerals1234

Health Benefits and Uses

• Cardiovascular Support:
  Rich in omega-3 and omega-6 fatty acids, walnut oil helps maintain arterial flexibility, supports healthy blood flow, and is associated with reduced risk of hypertension and heart disease14.

• Skin Health:
  Contains vitamin E, B vitamins, and niacin, supporting skin hydration, elasticity, and repair. Used topically for fungal infections, redness, eczema, and as a natural moisturizer with anti-aging effects.

• Antioxidant Activity:
  High levels of tocopherols and phenolics provide strong antioxidant protection against free radical damage, supporting cellular health and slowing aging14.

• Culinary Uses:
  Walnut oil’s delicate, nutty flavor makes it ideal for salad dressings, drizzling over cold dishes, or as a finishing oil for pastries and baked goods. It is not recommended for high-heat cooking, as heat can degrade its flavor and nutritional value1.

• Other Benefits:
  May have anti-inflammatory, cholesterol-lowering, neuroprotective, and immunomodulatory properties4.

Summary Table

Walnut oil is a versatile, nutrient-rich oil valued for both its culinary and therapeutic applications. Its high content of polyunsaturated fatty acids, antioxidants, and bioactive compounds makes it a premium choice for heart health, skin nourishment, and gourmet cuisin