See also:pharmacy, the name given to preparations formed by evaporating or concentrating solutions of active principles; tinctures are solutions which have not been subjected to any evaporation . " Liquid extracts " are those of a syrupy consistency, and are generally prepared by treating the
See also:drug with the solvent (
See also:alcohol, &c.) and concentrating the solution until it attains the desired consistency . " Ordinary extracts " are thick, tenacious and sometimes even dry preparations; they are obtained by evaporating solutions as obtained above, or the juices expressed from the
See also:plants . /Extraction, in chemical technology, is a
See also:process for separating one substance from another by taking
See also:advantage of the varying solubility of the components in some chosen solvent . The
See also:term " lixiviation " is used when water is the solvent . In laboratory practice all the
See also:common solvents are employed . With small quantities it may suffice to shake the substance with the solvent, the mixture being heated if necessary,
See also:filter and distil or otherwise remove the solvent from the distillate . For larger quantities continuous extraction is advisable . This may be carried out in many forms of apparatus; one of the most convenient is the Soxhlet extractor, in which the extract siphons into the
See also:flask containing the solvent, and so maintains the quantity of available solvent practically
See also:constant . Continuous extraction is generally the practice in technology . One of the most important applications is in the
See also:fat and gelatine
See also:industries .
EXTORTION (Lat. extorsio, from extorquere, to twist...
EXTRADITION (Lat. cx, out, and traditio, handing ov...
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