Download Pharmacognosy - dulcejulia91

Pharmacognosy
Drugs and Technical Products
Biosynthetic process
Biosynthesis (also called biogenesis) is an enzyme-catalyzed process in cells
of living organisms by which substrates are converted to more complex products.[1]
The biosynthesis process often consists of several enzymatic steps in which the
product of one step is used as substrate in the following step. Examples for such
multi-step biosynthetic pathways are those for the production of amino acids, fatty
acids, and natural products.[2] Biosynthesis plays a major role in all cells, and many
dedicated metabolic routes combined constitute general metabolism.
The prerequisites for biosynthesis are precursor compounds, chemical energy (such as
in the form ATP), and catalytic enzymes, which may require reduction equivalents
(e.g., in the form of NADH, NADPH).
Commonly known complex products of biosynthesis include proteins, vitamins, and
antibiotics. Most organic compounds in living organisms are built in biosynthetic
pathways.
( ^ Alberts, Bruce (2002). Molecular biology of the cell. New York: Garland
Science. ISBN 0-8153-3218-1.
 ^ Jones, Russell Celyn; Buchanan, Bob B.; Gruissem, Wilhelm (2000).
Biochemistry & molecular biology of plants. Rockville, Md: American Society of
Plant Physiologists. pp. 371–2. ISBN 0-943088-39-9.)
Crude drugs
Crude medicine (simplified Chinese: 药材; traditional Chinese: 藥材; pinyin:
yàocái), (also known as crude drug in the Chinese materia medica) are bulk drugs
from the Chinese materia medica basic processing and treatment.
Overview
1916 Eli Lilly crude drug case for pharmacy students to study: contains 216 different
specimens
A crude drug[1] is any naturally occurring, unrefined substance derived from organic
or inorganic sources such as plant, animal, bacteria, organs or whole organisms
intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease
in man or other animals.
Crude drugs[2] are unrefined medications in their raw or natural forms. Prior to the
1950s, every pharmacy student learned about crude drugs in pharmacognosy class.
Pharmacognosy is the study of the proper horticulture, harvesting and uses of the raw
medications found in nature.
Raising, harvesting and selling crude drugs was how many large pharmaceutical
companies started out. Companies such as Eli Lilly and Company[3] sold crude drugs
to pharmacists to save them time and money, but the early pharmacy graduate would
know how to raise their own crude drugs if need be.
[edit] History
In times past, the hunter-gatherer community kept knowledge about the medicinal
properties of various plants, molds, fungi, yeasts, bacteria, minerals and animals. This
drug knowledge would include vast amounts of information like what time of the year
to look for specimens, where to look, and what part of the plant to use or how to grind
a mineral.
Creighton University College of Pharmacy crude drugs circa 1910
As cultures developed in specialization, a person would take on the combined role of
physician, pharmacist and priest or minister}. These specialized people would be in
charge of the community’s physical, mental, emotional and spiritual health.
In English these are often called "medicine men" or shaman. The word shaman comes
from Manchu, and is "the only commonly used English word that is a loan from this
language".[4] The shaman would use various items from nature to produce a mixture
that would be burned, applied, manipulated or ingested in some fashion to help relieve
the symptoms the ailing patient.
Eventually, the use of crude drugs reach a zenith in the early 1900s and eventually
gave way to the use of purified active ingredients from the natural source. Currently
the use and exploration of crude drugs has again gained prominence in the medical
community. The realization that many completely unknown substances are yet to be
discovered from crude drugs has created a new interest in pharmacognosy and has led
to many medical breakthroughs.
In 1907, the Pure Food and Drug Act was implemented and standardization of crude
drugs took place. Often the USP would specify what percentage of active ingredient
was needed to claim a crude drug met USP standards.
An example of standardization would be as follows (from the United States
Pharmacopeia)[5]:
Opium is the air-dried milky exudate obtained by incising the unripe capsules of
Papaver somniferum Linne or its variety album De Candolle (Fam. Papaveraceae).
Opium in its normal air-dried condition yields not less than 9.5 percent of anhydrous
morphine.