Paper chromatography essay

One manner of making this is through size exclusion chromatography SEC. Proteins are really delicate constructions so when you utilizing purification techniques it is of import to sublimate the protein in as few stairss as possible because the more a protein is handled, the hazard of denaturation additions exponentially Lab Manual. Most frequently, recombinant DNA engineering utilizing bacterial cells is used to fix a beginning for a specific mark protein. This means that the instructions to make a protein are inserted into a plasmid.

Paper chromatography essay

More Essay Examples on Protein Rubric The mixture is distributed as the solvent moves down the column. Thin Layer Chromatography, or TLC, also uses a powder absorbent which is fixed to a metal, plastic or glass plate as its stationary phase.

The mixture to be analyzed is placed near the bottom of the plate and it is then submerged to a specific amount of solvent which is the mobile phase. Gas Chromatography requires a long metal or glass column containing a high boiling liquid which would serve as the stationary phase and an inert gas to flow on the column as the mobile phase.

Lastly, Paper Chromatography uses a cellulose chromatogram paper as its stationary phase and the solvent as the mobile phase. Inchromatography was first discovered by Mikhail Tswett, a Russian botanist, by producing a colorful separation of plant pigments through calcium carbonate.

From the discovery, column adsorption chromatography was coined. Fritz Cremer successfully separated carbon dioxide and oxygen by gas chromatography. Retention factor Rf is the ratio of the distance travelled by the sample to the distance travelled by the solvent, multiplied by Eq.

Rf is used to comparing the results in order to identify an unknown sample. Impurities and interactions made by a sample to another would affect Rf value. Equation 1-Retention Factor This laboratory technique has been helpful in various ways.

It is used by pharmaceutical companies in preparing large amounts of pure compounds. In the food industry, chromatography is used to separate preservatives and additives to ensure food quality.

It is also used to identify drug intake in the urine. This experiment used paper chromatography to separate organic compounds, to compute Rf values and to identify unknown compounds using Rf values. In this experiment, the organic compounds to be used are in Table 1. The materials needed were mL beaker, capillary tubes, petridish or watch glass and chromatogram paper.

The retention factor Rf of each test compounds was determined by paper chromatography process Process 1. Based from the results, methyl orange travelled the most in paper while methylene blue travelled the least Figure 3.

Figure 3 — Results The Retention factor Rf tells how far the dye would travel depending on the distance travelled by the solvent Equation 1. It ranges from 0 to 1. These dyes were compared to the color and distance travelled by the pure dyes.

Here, the distances were measured in millimeters, then it was divided by the distance travelled by the solvent which is 60 mm.

To get Rf values that are whole numbers, it was multiplied by Table 4 shows the calculated Rf values of the samples and the unknown. The solubility of the dyes had affected their Rf values.

If the dyes are more soluble to ethanol, then it would obtain a high Rf value. From table, Methylene Blue had the lowest Rf since it is less soluble. Ethanol is a polar solvent while Methylene Blue is a non-polar.

Polar solvents are much considered than the non-polar. This is due to the attraction between the cellulose fiber and sample. If the samples are polar, it would tend to react with the paper than the non-polar solvent.

Paper chromatography essay

This would create a partition chromatography. Some precautions were observed during the experiments to avoid erroneous results. The beaker must be covered tightly. The reason for covering the beaker is to make sure that the atmosphere in the beaker is saturated with solvent vapor.

To help this, the beaker is often lined with some filter paper soaked in solvent. Saturating the atmosphere in the beaker with vapor stops the solvent from evaporating as it rises up the plate.

The sample spot must be above the solvent level to avoid mixing them with the liquid to be absorbed. In stapling the edges of the paper, it must not overlap so that the mobile phase may not travel in a path that is not vertical.

Do not move the beaker, because moving the beaker will affect the results from the paper.Paper Chromatography Products Fisherbrand™ Pure Cellulose Chromatography Paper Pure cellulose papers with smooth surfaces are tested to assure uniformity and reproducibility, and offer optimum separation and sample resolution.

Paper chromatography is an analytical method used to separate colored chemicals or substances. It is primarily used as a teaching tool, having been replaced by other chromatography methods, such as thin-layer chromatography. Chromatography is a technique used to separate mixtures of compounds.

There are many different types of Chromatography, including: paper chromatography, ion concentration chromatography, gas-liquid chromatography, thin layer chromatography, partition chromatography and gel-permeation chromatography.3/5(2).

Paper chromatography works majorly on capillary attractions. The capillary attraction which depends on adhesive and cohesive forces allows the mobile phase to move up the stationary phase due to created surface tension interaction from the forces.

Paper chromatography and thin-layer chromatography are simple techniques that can be used to separate mixtures into their individual components. The methods are very similar in operation and principle, differing primarily in the medium used for the analysis.

Separation of Photosynthetic Pigments by Paper Chromatography - Separation of Photosynthetic Pigments by Paper Chromatography Introduction Chlorophyll is in fact only one pigment in a group of closely related pigments commonly found in photosynthesising plants called photosynthetic pigments.

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