Tannins & Its Identification Tests

• Tannins & Its Identification Tests ensure quality, purity, and therapeutic value of herbal formulations
• Tannins & Its Identification Tests confirm presence through color reactions, precipitation, and chemical assays.

Definition

• Tannins are polyphenolic compounds that have astringent properties and the ability to bind proteins.

Examples

• Gallic acid (found in Tea, Oak bark)
• Catechin (found in Green tea)

Properties of Tannins & Its Identification Test

• Water-soluble and astringent in taste.
• Forms complexes with proteins, alkaloids, and metals.
• Have antioxidant and antimicrobial properties.

Tests for Identification:

1. Ferric Chloride Test:

   • Reagent: 5
   • Positive Result: Blue-black or green color indicates tannins.

2. Gelatin Test:

   • Reagent: Gelatin solution.
   • Positive Result: White precipitate

3. Goldbeater’s Skin Test:

   • Reagent: Goldbeater’s skin (ox intestine) + HCl.
   • Positive Result: Brownish-black color.

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