This document discusses methods for evaluating herbs. It begins by defining evaluation as identifying a drug's identity, quality, and purity. It then outlines the need to evaluate herbs to understand biochemical variations, treatment effects, proper storage, and adulteration. The document describes the main methods of evaluation as organoleptic, physical, chemical, and biological parameters. It provides examples of each method, such as using the senses for organoleptic evaluation, measuring viscosity and moisture content for physical evaluation, and testing effects on living systems for biological parameters. In conclusion, the document states that proper herb evaluation is needed to ensure identity, quality, and purity for the best therapeutic outcomes.

1. Presented By
University of Science and Technology Chittagong
Department of Pharmacy
Methods currently employed in
evaluating herbs
Supervisor Name: Dr. Nazmun Nahar
Lecturer, Department of Pharmacy
Mahajuba Alam Momo
Roll: 1348
Reg: 1351

2. Content List
• Introduction
• Need for evaluation of herbs
• Methods for evaluating herbs
• Organoleptic Evaluation
• Physical Evaluation
• Chemical Evaluation
• Biological Parameters for Evaluation
• Conclusion
• Reference

3. Introduction
Evaluation means to identify and to
determine the identity, quality and purity of
a drug.
(1) Identity – identification of biological
source of the drug.
(2) Quality – the quantity of the active
constituents present.
(3) Purity – the extent of foreign organic
material present in a crude drug.

4. Need for evaluation of herbs
The main reasons behind the need for evaluation of herbs are -
 Identification of biochemical variation present in the
drug of the herb
 The effect of treatment for the disease using dug
present in the herbs
 Proper knowledge of storage of the herbs
 Knowing the adulterations and substitutions of herbs

5. Methods for evaluating herbs
Methods currently employed in evaluating herbs are
 Organoleptic
 Physical
 Chemical
 Biological parameters.

6. Organoleptic Evaluation
Organoleptic evaluation means the study of drugs using organs of
senses. It refers to the methods of analysis like -
• color,
• touch
• odor,
• taste,
• size and shape etc.

7. Physical Evaluation
Viscosity
Melting
Point
Optical
Rotation
Rf
Values
Volatile
Oil
Content
Moisture
Content

8. Chemical Evaluation
Determination of the active
ingredient in a drug by chemical tests
is referred to as chemical evaluation.
The following are various methods of
chemical evaluation:
 Instrumental methods :
colorimetry, flourimetry
spectrophotometry etc.
 Chemical Constants : acid value,
iodine value and ester value etc.

9. Biological Parameters for Evaluation
It is used when the drug cannot be evaluated properly by
chemical and physical methods.
In this method, the drug is tested on the living system and then
the response from the living system is compared with the
stranded preparation.

10. Biological Parameters for Evaluation

11. Conclusion
Evaluation ensures the identity of a drug and determines
the quality and purity of drugs. So the proper evaluation
of herbs is needed to get the best outcome of drug from
the herbs.

12. Reference
[1] Akter R, Hasan SR, Siddiqua SA, Majumder MM, Hossain MM, Alam MA,
Haque S, Ghani A. Evaluation of Analgesic and Antioxidant Potential of the Leaves
of Curcuma alismatifolia Gagnep. Stamford Journal of Pharmaceutical Sciences.
2008;1(1):3-9.
[2] Ali M. Textbook of Pharmacognosy.(2ndedn).
[3] Tyler VE, Brady LR, Robbers JE. Pharmacognosy. (No Title). 1988.

13. Thank You