What is the function of thimble in Soxhlet extraction?
The thimble ensures that the rapid motion of the solvent does not transport any solid material to the still pot. This cycle may be allowed to repeat many times, over hours or days. During each cycle, a portion of the non-volatile compound dissolves in the solvent.
What is Soxhlet method of extraction?
Soxhlet extraction is an exhaustive extraction technique widely applied to analytes that are sufficiently thermally stable. The extraction solvent is continuously cycled though the matrix, by boiling and condensation, with the sample being collected in the hot solvent.
What were the disadvantages of using the Soxhlet extraction method?
Despite disadvantages of this procedure (poor extraction of polar lipids, long time involved, large volumes of solvents, hazards of boiling solvents), several methods involving automatic solvent extraction were described.
Which are the three parts of Soxhlet apparatus?
A Soxhlet Extractor has three main sections: A percolator (boiler and reflux) which circulates the solvent, a thimble (usually made of thick filter paper) which retains the solid to be laved, and a siphon mechanism, which periodically empties the thimble.
What is extraction thimble?
The extraction thimbles are suitable for Soxhlet-type, Tecator type or similar devices. They are located in the extractor body, used to accommodate a sample of solid material to extract certain components out, with the addition of sufficient and an appropriate solvent.
How do you use an extraction thimble?
The extraction thimble is mainly used to place the substance to be extracted in a container of the glass below, and then the solution is repeatedly soaked to extract the desired components from the material (for example, extracting pesticide residues from the pepper), the experimental procedure is called Soxhlet …
What is Soxhlet apparatus in chemistry?
A soxhlet extractor is a laboratory apparatus for the extraction of lipids and other molecules from a solid sample. A soxhlet extraction apparatus is composed of a condenser, a soxhlet extractor, and round bottomed flask.
What is the main advantage of Soxhlet extraction?
The advantages of the Soxhlet extractor are: simple and clear design, production process continuity, ease of visual monitoring of the process, a low flow of solvent and the possibility of its reuse after stripping and distillation.
What are the major factors which affects the efficiency of Soxhlet extraction?
Besides the type of solvent and its concentration, the solvent:solid ratio, number of extraction steps, pH, time of contact, temperature, and particle size of the solid matrix are also key factors in SLE processes because they affect both the kinetics of phenolics release from the solid structure and the antioxidant …
Which solvent is used in Soxhlet extraction?
The Soxhlet extraction process heats the solvent (ethanol) to boiling temperature (>78°C). The evaporated ethanol is contained within the apparatus by the condenser unit; however the apparatus should be placed under a fume hood in case of escape.
What is the function of thimble what is it composed of?
thimble, small, bell-shaped implement designed to protect the end of the finger when sewing. Among the earliest known thimbles, dating from before ad 79, were those made of bronze and found at Pompeii and Herculaneum. Modern thimbles are almost exclusively produced in plastic or soft metals.