🧪 Inorganic Chemistry Unit 1 Notes (B.Pharm) Lacture -1 Impurities in Pharmaceutical substances explained with examples

 

🧪 Inorganic Chemistry Unit 1 Notes (B.Pharm)

📌 Introduction

Inorganic chemistry is a fundamental subject in pharmaceutical sciences. It focuses on drug purity, detection of impurities, and maintaining quality standards.

🧩 What are Impurities?

Impurities are unwanted substances present in pharmaceutical products that may affect their safety and efficacy.

Types of Impurities:

• Organic impurities
• Inorganic impurities
• Residual solvents

⚠️ Sources of Impurities

Impurities can originate from:

• Raw materials
• Manufacturing process
• Storage conditions
• Containers

🔬 Limit Test

Limit tests are semi-quantitative tests used to detect impurities within acceptable limits.

Common Limit Tests:

• Chloride
• Sulphate
• Iron
• Arsenic
• Heavy metals

🧪 Example: Limit Test for Chloride

Principle:

Chloride ions react with silver nitrate to form a white precipitate of silver chloride.

Reaction:

NaCl + AgNO₃ → AgCl ↓

Interpretation:

The turbidity of the test solution is compared with a standard solution.

• Within limit → Acceptable
• Above limit → Rejected

📘 Pharmacopoeia

Pharmacopoeia is an official reference book that sets standards for drugs.

Types:

• Indian Pharmacopoeia (IP)
• British Pharmacopoeia (BP)
• United States Pharmacopoeia (USP)

🎯 Conclusion

Understanding impurities and limit tests is essential for ensuring drug safety, quality, and effectiveness.

🎥 Watch this video to understand “Impurities in Pharmaceutical Substances” in the easiest way using daily life examples like salt, water, rice, and tea.

This video will help you:

✔ Understand the concept clearly

✔ Remember topics easily

✔ Write perfect answers in exams

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