Questions
1 question per major B.Pharm paper
Difficulty
Medium
Importance
Core foundational topic for semester exams
Overview
The classification and sourcing of crude drugs form the foundational bedrock of Pharmacognosy, focusing on the systematic organization of natural medicinal products. Understanding these methods is essential for pharmacy students to simplify drug identification, storage, and pharmaceutical research.
Taxonomical Classification
This method relies on the botanical relationship between plants, organizing them according to their taxonomic hierarchy including phylum, class, order, family, genus, and species. It is primarily used for the systematic study of plants rather than for chemical or therapeutic drug classification.
- Based on natural evolutionary relationships
- Uses Engler and Prantl or Bentham and Hooker systems
- Provides exact botanical identity
- Useful for academic research and botanical surveys
- Lacks correlation between phytochemical content and medicinal properties
Cultivation of Crude Drugs
Cultivation refers to the process of growing medicinal plants under controlled environmental conditions to ensure uniform quality and consistent active constituent yield. It is crucial for preventing the depletion of natural wild resources and ensuring a sustainable supply chain.
- Involves soil preparation, fertilization, and irrigation
- Controls genetic factors for higher active constituents
- Reduces contamination with extraneous plant matter
- Ensures standardization of medicinal plant products
- Enables large-scale commercial availability
Collection and Harvesting
The timing and method of collection directly influence the quality of the drug because the concentration of active constituents fluctuates with the plant's life cycle. Proper harvesting techniques are required to prevent degradation and ensure maximum potency.
- Collection timing based on biological maturity
- Active ingredients often vary seasonally
- Methods must minimize damage to the plant tissue
- Post-harvest processing involves drying and cleaning
- Root harvesting is generally done during the dormant period
Exam Tip
When writing about classification, always provide a clear disadvantage; for taxonomical classification, emphasize that it fails to represent the chemical therapeutic value of the drug.
Common Mistakes
- Confusing morphological classification with taxonomical classification in exam answers.
- Neglecting to mention that taxonomical classification ignores the chemical active constituents.
- Failing to link the seasonal timing of collection to the physiological maturity of the plant.
More Revision Notes
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