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Summary of Operation
The Labconco extractor reduces extraction time from 16 hours to about four
hours through its efficient refluxing system. The operation is carried out by
using a Pyrex
®
beaker as the solvent chamber. The procedure involves
placing the samples between the boiling solvent and a cold surface. As
boiling continues, the solvent vaporizes, condenses on the cold surface and
washes back through the samples to the boiling solvent below.
Procedures
The following section provides a general outline of steps necessary to operate
a routine extraction on the Labconco Goldfisch Fat Extractor. Actual test
methods, sample preparation, solvent choices, etc. are determined by official
methods of the A.O.A.C. and should be referred to in all cases.
1
(1)
Turn on cold water supply. Check visual flow at the drain area.
Water flow will be adjusted later after system is operating to obtain
normal reflux rate. Heater and water flow rates may be adjusted to
vary reflux rates according to the operator’s preference.
(2)
Prepare sample(s) per standard method for the product under
examination. See assembly drawing in Appendix A.
(3)
Place required quantity of sample in the extraction thimbles. Filter
paper or fritted glass thimbles may be substituted according to
operator preference.
(4)
Place thimble containing sample into Pyrex sample tube.
(5)
Insert sample tube assembly into clip from the front. Push upward
until bulb of sample container meets holding clip.
1
For more information, see “Official Methods of Analysis” of the Association of Official
Analytical Chemists.
