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Centrifuging a SampleJohn W. Moore, Jerrold J. Jacobsen, Lois M. Browne, John F. Zimmerman The demonstration on this page shows a technique that should not be used by undergraduate chemistry laboratory. This video shows what happens to sample in a centrifuge while the centrifuge is on, and the result of stopping the centrifuge improperly. A narrative is included in this video: The centrifuging process allows the solvent to completely settle out. The jarring caused by hand braking destroys the distinct separation between supernatant and solid.
Separation Science |
Laboratory Equipment / Apparatus
Centrifuge Centrifuging safety considerations, centrifuging a sample, loading and unloading a centrifuge, removing the supernatant, and washing the precipitate are discussed and demonstrated.
Laboratory Equipment / Apparatus |
Separation Science
Extraction Use of a separatory funnel to carry out extraction is demonstrated.
Greener Alternative to Qualitative Analysis for Cations without H2S and Other Sulfur-Containing CompoundsIndu Tucker Sidhwani and Sushmita Chowdhury The classic technique for the qualitative analysis of inorganic salts and mixtures relies on highly toxic hydrogen sulfide. Increasing environmental awareness has prompted the development of a green scheme for the detection of cations by spot tests that is simple and fast. Sidhwani, Indu Tucker; Chowdhury, Sushmita. J. Chem. Educ.2008, 85, 1099.
Green Chemistry |
Qualitative Analysis |
Separation Science
HPLC Analysis of α- and β-Acids in HopsTravis M. Danenhower, Leyna A. Force, Kenneth J. Petersen, Thomas A. Betts, and Gary A. Baker Describes a high-performance liquid chromatography method for the quantitation of the predominant a-acids (humulone, cohumulone, and adhumulone) and -acids (lupulone, colupulone, and adlupulone) present in hops. Danenhower, Travis M.; Force, Leyna A.; Petersen, Kenneth J.; Betts, Thomas A.; Baker, Gary A. J. Chem. Educ.2008, 85, 954.
Chromatography |
Food Science |
HPLC |
Instrumental Methods |
Plant Chemistry |
Quantitative Analysis |
Separation Science
Separation of the Carotenoid Bixin from Annatto Seeds Using Thin-Layer and Column ChromatographyJames V. McCullagh and Nicholas Ramos In this experiment the carotenoid bixin is isolated from annatto seeds using column chromatography and then analyzed by UVvis and IR spectroscopy. The procedure has several advantages over previous pigment separation experiments. McCullagh, James V.; Ramos, Nicholas. J. Chem. Educ.2008, 85, 948.
