Chromatography is a physical method of separation in which the components to be separated are distributed between two phases, one of which is stationary (stationary phase) while the other (the mobile phase) moves in a definite direction. It separates the analyte to be measured from other molecules in the mixture and allows it to be isolated. Chromatography may be preparative or analytical. Preparative chromatography seeks to separate the components of a mixture for further use (and is thus a form of purification).
Analytical chromatography normally operates with smaller amounts of material and seeks to measure the relative proportions of analytes in a mixture. In modern medicine, specialist or scientists make use of this chromatography to examine a mixture, its components, and their relations to one another or to analyze. They also make use of this to separate the components in order to isolate one of interest for further study or to purify. Another is to determine the identity of a mixture or components based on known components or to identify.
Candy Chromatography Essay Example
Scientist also makes use of chromatography to determine the amount of the mixture or the components present in the sample or quantification. Chromatography works because the components of the mixture will differ in how much they “stick” to things: to each other, and to other substances. For example, some of the components of the ink will stick more tightly to the paper fibers. They will spend less time in the water as it moves along the paper fibers, and thus they will not travel very far. Other components of the ink will stick less tightly to the paper fibers.
They will spend more time in the water as it moves along the paper fibers, and thus they will travel farther through the paper. Other materials than paper and water can be used for chromatography, but in each chromatography apparatus there is generally a stationary phase and a mobile phase. In paper chromatography, the paper is the stationary phase, and water is the mobile phase. Another example of a chromatography systems is a glass column filled with tiny, inert beads (the stationary phase).
The mixture to be separated is added to the column, and is then “washed out” with some type of solution (the mobile phase). In this case, the separation is based on molecular size. Smaller molecules will pass through the spaces between the beads more easily, so they will come out of the column more quickly. Larger molecules will take more time to pass between the beads, so they will come out of the column later. You can separate the smaller molecules from the larger molecules by collecting the liquid that comes off such a column in a series of separate containers.
Chromatography can be used to separate (purify) specific components from a complex mixture, based on molecular size or other chemical properties. It can also be used to identify chemicals, for example crime scene samples like blood, drugs, or explosive residue. Highly accurate chromatographic methods are used for process monitoring, for example to assure that a pharmaceutical manufacturing process is producing the desired drug compound in pure form. With colored mixtures in paper chromatography, you can see the components separate out on the paper.
Chromatography is essential to modern medicine and real life situations. Moreover, there are many types of chromatography used. There is gas chromatography, liquid chromatography, paper chromatography, and thin-layer chromatography. All of these have the same principles. It involves passing a mixture dissolved in a “mobile phase” through a stationary phase, which separates the analyte to be measured from other molecules in the mixture and allows it to be isolated.