What is pharmacognosy?

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Pharmacognosy is the study of drugs of Natural origin .The terms come from two greek words first "Pharmakon"means drugs or medicine and second is gnosis means knowledge .The american society of pharmacognosis define it as the study of physical ,chemical ,biochemical and biological properties of drugs or drugs substances of natural origin as well as search of drugs from natural sources .Therefore it os the study of drugs from plants and animals kingdom and their natural derevatives.
                                   production of crude drugs
1.collection
2.drying and storage of crude drigs
collection
                  It has been found that active constitutent in plants vary in amount and matured throughout the year.
#Rhubarb is collected in summer
#Hyascyamous muticus is collected in summer (alkaloids)
#Colichimu corm collected in spring (alkaloids)
TIME OF THE DAY
#Digitalis is collected in afternoon
#Solanaceous leaves are collected in morning
#Salix collected at night

General factor :
Flower are collected in dry weather
Leaves are collected when plant is flowering
Fruits and seed are collected when they are fully mature and unripe .
Barks in spring (when they are easily separated )
Unorganized are collected in dry seasons not in rainy

Method of drying:
drying in open air.
Artificial oven drying
Vaccum drying

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