Leaching or solid-liquid extraction are terms used to describe the extraction of soluble constituents from a solid or semisolid by means of suitable solvents.
Solid-Liquid
Extraction
INTRODUCTION
Leaching
or solid-liquid extraction are terms used to describe the extraction of soluble
constituents from a solid or semisolid by means of suitable solvents. The
process, which is used domestically whenever tea or coffee is made, is an
important stage in the production of many fine chemicals found naturally in
animal and vegetable tissues. Examples are found in the extraction of fixed
oils from seeds, this method offering an alternative to mechanical expression,
in the preparation of alkaloids, such as strychnine from Nux vomica beans or
quinine from Cinchona bark, and in the isolation of enzymes, such as renin, and
hor-mones, such as insulin, from animal sources. In the past, a wider
importance attended the process because the products of simple extraction
procedures, known as galenicals, formed the major part of the ingredients used
to fulfill a doctor’s prescription.
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