What is Pharmacognostic evaluation?
Pharmacognostic evaluation helps to screen the commercial varieties, substitutes, adulterants and any other quality control of the drugs. It is a simple and reliable tool, helps to obtain information about biochemical and physical properties of crude drug.
What is used for evaluation of leaf drug?
Stomatal Index: – It is the percentage which the number of stomata forms to the total no. of epidermal cells, each stoma being counted as one cell. I = S *100/(E+ S ) (where I = Stomatal Index. The stomatal index is useful for evaluation of leaf drug however, it is a constant for a given species.
What is significance of vein islet number?
2.2. Determination of vein-islet and vein termination number. Vein islet is the minute area of photosynthetic tissue encircled by the ultimate division of the conducting strands. Vein termination number is the number of veinlet terminations per mm of leaf surface.
What is Pharmacognostic study?
What is meant by Pharmacognostic features?
: a branch of pharmacology dealing especially with the composition, use, and development of medicinal substances of biological origin and especially medicinal substances obtained from plants. Other Words from pharmacognosy. pharmacognostic \ -ˌkäg-ˈnäs-tik \ or pharmacognostical \ -ti-kəl \ adjective.
What is drug in pharmacognosy?
Drugs are chemicals agents that acting selectively on the living organism are able to cure, mitigate or prevent diseases.
What will be required for determination of leaf constants?
Determination of leaf constants include stomatal number, stomatal index, vein islet, veinlet termination number and palisade ratios. Stomatal number is average number of stomata per sq. Stomatal index(S.I.)= S/(E+S)×100 Where, S=Number of stomata per unit area E= Number of epidermal cells in the same unit area.
What is leaf constant?
Leaf constants such as stomatal number, stomatal index, vein-islet number and veinlet termination numbers were also measured. Physiochemical parameters such as ash values, loss on drying, extractive values, percentage of foreign matters, swelling index, etc.
What is drying of crude drug?
Drying consists of removal of suffi-cient moisture content of crude drug, so as to improve its quality and make it resistant to the growth of microorgan-isms. Drying inhibits partially enzymatic reactions. Drying also facilitates pulverizing or grinding of a crude drug.
Which parameters use Pharmacognostic study of crude drugs?
All the parameters to be evaluated in pharmacognostic study such as organoleptic characters, macroscopic study, microscopic study, powder study, physico chemical analysis (moisture content, loss on drying, ash values, extractive values), phytochemical analysis, fluorescence analysis are enlisted along with their …
Why is pharmacognosy important?
Pharmacognosy is used by pharmaceutical companies to screen, characterize and produce new drugs for the treatment of human disease. Often, naturally occurring drugs cannot be mass-produced, so they must be studied in order to develop synthetic biosimilars.
How does pharmacognosy help in studying medicinal plants?
Answer: The knowledge of Pharmacognosy is extremely helpful in studying the uses of medicinal plants. It helps in understanding and finding out whether the plants are a source of drugs. It helps in deriving drugs from natural sources which can then be further studied and used for medicinal requirements.