Unit 1340: Pharmacognosy and Natural Products

1. Introduction to Pharmacognosy

• Definition and scope
• Historical background and evolution
• Importance in drug discovery and development
• Relationship with other pharmaceutical sciences (pharmacology, medicinal chemistry, phytotherapy)

2. Plant Kingdom Classification

• Overview of plant taxonomy and systematics
• Classification based on morphological characteristics
• Chemical-based classification relevant to pharmacognosy
• Major plant groups: Angiosperms, Gymnosperms, Bryophytes, Pteridophytes

3. Phytochemistry

• Definition and significance
• Primary metabolites: carbohydrates, proteins, lipids
• Secondary metabolites: alkaloids, flavonoids, terpenoids, glycosides, tannins, saponins
• Biosynthesis pathways of key phytochemicals
• Role of phytochemicals in pharmacological activities

4. Extraction Techniques in Pharmacognosy

• Principles of extraction
• Maceration: procedure, applications, advantages and limitations
• Percolation: methodology and uses
• Soxhlet extraction: principles and suitability
• Supercritical fluid extraction: technology and benefits
• Comparison of extraction methods and selection criteria

5. Screening of Plant Extracts

• Importance of bioactivity screening
• In vitro assays: antimicrobial, antioxidant, cytotoxicity tests
• In vivo assays: animal models and ethical considerations
• Bioassay-guided fractionation: concept and workflow
• Bioactivity profiling and data interpretation

6. Herbal Drugs and Traditional Medicine

• Overview of traditional medicine systems (Ayurveda, Traditional Chinese Medicine, Unani, etc.)
• Role of herbal drugs in healthcare
• Cultural and ethnobotanical significance
• Modern scientific validation of herbal remedies

7. Quality Control of Herbal Products

• Importance of quality assurance and safety
• Authentication techniques: macroscopic, microscopic, chemical markers
• Standardization and assay methods
• Good Manufacturing Practices (GMP) for herbal products
• Regulatory requirements and pharmacopoeial standards

8. Pharmacological Activities of Natural Products

• Antimicrobial activity: mechanisms and examples
• Anti-inflammatory properties and pathways
• Antioxidant effects and free radical scavenging
• Anticancer activities: molecular targets and natural agents
• Other pharmacological effects: analgesic, antiviral, immunomodulatory

9. Biotechnological Approaches in Pharmacognosy

• Plant tissue culture techniques: callus culture, micropropagation
• Metabolic engineering for enhanced bioactive compound production
• Use of genetically modified organisms (GMOs)
• Advantages and challenges of biotechnology in natural product research

10. Ethnopharmacology and Drug Discovery

• Definition and scope of ethnopharmacology
• Exploration of traditional knowledge and indigenous practices
• Biodiversity conservation and sustainable use
• Case studies of drugs derived from ethnopharmacological leads
• Ethical considerations and intellectual property rights