BP105T • Unit 5Topic 2 of 3⏱ 5 Min Read

2. Primary Metabolites in Pharmacy: Carbohydrates, Lipids & Proteins

💡 Core Concept & Clinical Context:

Pharmaceutical primary metabolites serve as essential excipients, gelling agents, binders, and active therapeutics. (1) Carbohydrates: Agar (dried gelatinous substance from red algae Gelidium amansii; acts as bulk laxative and microbiological culture media), Acacia Gum (dried gummy exudate from Acacia senegal; acts as suspending and emulsifying agent), Tragacanth (Astragalus gummifer; superior viscosity grade suspending agent). (2) Lipids: Castor Oil (fixed oil from Ricinus communis containing Ricinoleic acid; acts as stimulant cathartic), Chaulmoogra Oil (Hydnocarpus wightiana containing hydnocarpic acid; historically used for leprosy), Beeswax (Apis mellifera; ointment stiffener). (3) Proteins: Gelatin (collagen hydrolysis product; used for hard/soft capsule shells).

Clinical Scenarios & Pharmacopoeial Examples:

1Standard Chemical Identification Tests for Carbohydrates & Mucilage

Colorimetric reactions used in pharmacognostic screening.

Step-by-Step Breakdown:

•• Molisch's Test (General Carbohydrates): Sample + alpha-Naphthol in ethanol + Conc. H2SO4 along test tube wall -> Intense Violet/Purple ring at junction of two liquids.

•• Ruthenium Red Test (Plant Mucilage & Agar): Sample powder + Ruthenium Red reagent -> Turns bright Pink / Red (Acacia does not stain pink, distinguishing it from Tragacanth/Agar).

•• Swelling Factor Test for Agar: 1g Agar boiled with 100 mL water forms a stiff jelly on cooling.

•• Fehling's Test (Reducing Sugars): Fehling A + Fehling B heated with hydrolyzed sample -> Brick-red cuprous oxide (Cu2O) precipitate.

📋Key Takeaways & Exam Highlights

Agar: Composed of Agarose (gelling fraction) and Agaropectin (viscous sulfate fraction).
Acacia Gum: Composed of Arabin (calcium, magnesium, potassium salt of arabic acid).
Tragacanth: Composed of Bassorin (60-70% water-insoluble swelling fraction) and Tragacanthin (water-soluble fraction).
Castor Oil Cathartic Mechanism: Pancreatic lipases hydrolyze castor oil in duodenum into Ricinoleic Acid, which irritates small intestinal mucosa, stimulating peristalsis.

🇮🇳 हिन्दी व्याख्या (2. Primary Metabolites in Pharmacy: Carbohydrates, Lipids & Proteins)

अगर-अगर (Agar) लाल शैवाल से मिलता है और कल्चर मीडिया तथा कब्ज के इलाज में इस्तेमाल होता है। बबूल का गोंद (Acacia) इमल्शन बनाने के काम आता है। कैस्टर ऑयल में मौजूद रिसिनोलिक एसिड पेट साफ (Laxative) करता है।