See also:

• EXTRACT (from Lat. extrahere, to draw out)

EXTRACT (from See also:

• LAT

Lat. extrahere, to draw out)  , in See also:

• PHARMACY

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
• DRUG (from Fr. drogue, a word common in Romance languages, cf. Span. and Ital. droga; the origin of the word is obscure, but may possibly be connected with Dutch droog, dry)

drug with the solvent (See also:

• WATER

water, See also:

• ALCOHOL

alcohol, &c.) and concentrating the See also:

• SOLUTION (from Lat. solvere, to loosen, dissolve)

solution until it attains the desired consistency . " See also:

• ORDINARY (med. Lat. ordinarius, Fr. ordinaire)

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

plants . /Extraction, in chemical technology, is a See also:

• PROCESS

process for separating one substance from another by taking See also:

• ADVANTAGE

advantage of the varying solubility of the components in some chosen solvent . The See also:

• TERM

term " lixiviation " is used when water is the solvent . In laboratory practice all the See also:

• COMMON

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 (a word common in various forms to most European languages, adapted from the medieval Lat. fi-ltrum, felt, a material used as a filtering agent)

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 See also:

• EXTRACT (from Lat. extrahere, to draw out)

extract siphons into the See also:

• FLASK

flask containing the solvent, and so maintains the quantity of available solvent practically See also:

• CONSTANT, BENJAMIN (1845-1902)

constant . Continuous extraction is generally the practice in technology . One of the most important applications is in the See also:

• FAT (O.E. fdett; the word is common to Teutonic languages, cf. Dutch vet, Ger. Fett, &c., and may be ultimately related to Greek Irian, and =apos, and Sanskrit pivan)

fat and gelatine See also:

• INDUSTRIES

industries .