Introduction to Tannins

• Introduction to Tannins: Polyphenolic compounds found in plants with astringent properties.
• Introduction to Tannins: Used in leather tanning, medicine, and as antioxidants.
• Tannins are water-soluble polyphenolic compounds found in many plants that bind and precipitate proteins, offering astringent properties.

Structure & Classification:

• Polyphenolic Nature: High-molecular-weight polyphenolic compounds.
• Types:
  • Hydrolyzable Tannin: Gallic or ellagic acid esterified with sugars.
  • Condensed Tannin: Polymers of flavonoid units, resistant to hydrolysis.

Functions Tannin in Plants:

• Defense: Deter herbivores and protect against microbial infections by binding proteins and inhibiting digestive enzymes.
• Astringency: Contribute to the astringent taste in fruits and beverages by precipitating proteins.

Pharmacological & Industrial Uses of Tannins:

• Medicinal Properties: Exhibit antioxidant, anti-inflammatory, and antimicrobial effects.
• Industrial Applications: Used in leather tanning, wine clarification, and as natural dyes.

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