About Pharmaceutical Inorganic Chemistry
Subject Code
BP104T
Semester
Semester 1
Credits
4 Credits
Pharmaceutical Inorganic Chemistry (BP104T) deals with the study of macroscopic and microscopic impurities in pharmaceutical substances and their removal. It covers the preparation, properties, and medicinal uses of inorganic compounds like Antacids, Haematinics, and Radiopharmaceuticals. This subject lays the chemical foundation for understanding how inorganic elements serve as life-saving drugs.
Key Learning Objectives
- Perform Limit Tests: Identify and quantify impurities (Arsenic, Lead, Chloride, Sulphate) in drug substances.
- Understand Buffers: Explain the mechanism of buffer systems and isotonic solutions.
- Classify GI Agents: Describe the mechanism of action of Antacids, Acidifiers, and Cathartics.
- Handle Radiopharmaceuticals: Understand the properties, storage, and handling of radioactive substances.
- Analyze Medicinal Uses: Know the preparation and assay of essential inorganic drugs like Ferrous Sulphate and Ammonium Chloride.
Syllabus & Topics Covered
Unit 1: Impurities in Pharmaceutical Substances
- Impurities: History of Pharmacopoeia, Sources and types of impurities, principle involved in the limit test for Chloride, Sulphate, Iron, Arsenic, Lead and Heavy metals, modified limit test for Chloride and Sulphate.
- General Methods: General methods of preparation, assay for the compounds superscripted with asterisk (*), properties and medicinal uses of inorganic compounds.
Unit 2: Acids, Bases, Buffers & Dental Products
- Acids, Bases and Buffers: Buffer equations and buffer capacity in general, buffers in pharmaceutical systems, preparation, stability, buffered isotonic solutions, measurements of tonicity, calculations and methods of adjusting isotonicity.
- Major Electrolytes: Functions of major physiological ions, Electrolytes used in the replacement therapy: Sodium chloride*, Potassium chloride, Calcium gluconate* and Oral Rehydration Salt (ORS), Physiological acid base balance.
- Dental Products: Dentifrices, role of fluoride in the treatment of dental caries, Desensitizing agents, Calcium carbonate, Sodium fluoride, and Zinc eugenol cement.
Unit 3: Gastrointestinal Agents
- Acidifiers: Ammonium chloride* and Dil. HCl.
- Antacid: Ideal properties of antacids, combinations of antacids, Sodium Bicarbonate*, Aluminum hydroxide gel, Magnesium hydroxide mixture.
- Cathartics: Magnesium sulphate, Sodium orthophosphate, Kaolin and Bentonite.
- Antimicrobials: Mechanism, classification, Potassium permanganate, Boric acid, Hydrogen peroxide*, Chlorinated lime*, Iodine and its preparations.
Unit 4: Miscellaneous Compounds
- Expectorants: Potassium iodide, Ammonium chloride*.
- Emetics: Copper sulphate*, Sodium potassium tartarate.
- Haematinics: Ferrous sulphate*, Ferrous gluconate.
- Poison and Antidote: Sodium thiosulphate*, Activated charcoal, Sodium nitrite.
- Astringents: Zinc Sulphate, Potash Alum.
Unit 5: Radiopharmaceuticals
- Radiopharmaceuticals: Radio activity, Measurement of radioactivity, Properties of α, β, γ radiations, Half life, radio isotopes and study of radio isotopes – Sodium iodide I131.
- Applications: Storage conditions, precautions & pharmaceutical application of radioactive substances.
How to Score High in Pharmaceutical Inorganic Chemistry
- 1
Reactions are Key: For Limit Tests (especially Arsenic and Iron), memorize the chemical reactions. Examiners look for balanced equations.
- 2
Draw the Apparatus: Practice drawing the ‘Gutzeit Apparatus’ for the Limit Test of Arsenic. It’s a standard question.
- 3
Classify & Exemplify: For Unit 3 and 4, create tables with Class -> Example -> Use (e.g., Astringent -> Zinc Sulphate -> Protein Precipitant).
- 4
Assay Principles: Don’t just learn the procedure; understand the *principle* behind the assay of compounds like Copper Sulphate or Ammonium Chloride.
- 5
Radiopharma Safety: Focus on the ‘Safety & Storage’ aspect of radiopharmaceuticals, not just the physics.
Why it Matters for Career
Inorganic chemistry forms the basis of many formulations. Understanding impurities (Limit Tests) is the very first step in Quality Control. Knowledge of electrolytes and GI agents is essential for Hospital Pharmacists to understand IV fluids and antacid therapy.
Exam Weightage
This is a ‘Reaction-based’ subject. You cannot score well without writing chemical equations for Limit Tests and Assays. The Limit Test for Arsenic and Lead are repeated almost every year. Unit 5 (Radiopharmaceuticals) is a small unit but guarantees a 7-10 mark question.
Frequently Asked Questions (FAQs)
Do I need to memorize atomic weights?
Usually, atomic weights are provided, but knowing common ones (H, O, C, N, Na, Cl, S) helps in calculating molecular weights for standard solutions.
What is the difference between Limit Test and Assay?
A Limit Test is a semi-quantitative test to check if an impurity is within Acceptable Limits (Pass/Fail). An Assay is a quantitative determination of the exact percentage purity of a substance.
Is Radiopharmaceuticals a difficult unit?
No, it is one of the easiest. It is purely theoretical with no complex reactions. Focus on definitions, half-life, and applications to score full marks.