Chromatography of Food Dyes Name: Cassandra DeVaux Date: April 17‚ 2014 Purpose: To learn how mixtures of compounds can be separated and what food dyes are found in certain foods Introduction: In this exercise we will separate food dyes from a variety of sources. We will first gather data on known dyes where we know how many substances make up the dye. Then we will collect data on some samples where we do not know the make-up. We will compare our known dyes with our unknown samples
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product‚ research has been done to improve the coloring affects and to minimize the damage to the hair. In the market‚ several different kinds of hair coloring products are available. Hair coloring can be applied through coloring shampoos or hair dyes. The hair coloring products can be categorized in
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The U.S Constitution was written in 1787. The Founding Fathers “recognized that government depended on the consent of the governed” (Dye & Gaddie‚ 80). The citizens of the United States give the government permission to have a government. The Founding Fathers are very significant because they provided limits on the power of the majority and safeguarded the rights of the minority. The Bill of Rights also provides safety for the minority and does not allow the majority to exceed their power. The paradox
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the experiment‚ the stationary phase was the filter paper onto which the dye samples were dropped onto while the mobile phase was the solvent mixture containing ethanol and water which carried the sample dyes as the mixture went up the paper at different rates. These rates depend on the solubility and polarity of compounds in solvent. The objectives of this experiment are to compute the retention factor values of 6 sample dyes: methyl
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CHAPTER 1 Introduction Background of the Study Nowadays‚ most documents need to be printed. For most students and office workers‚ their homes are not complete without the printer. Owning this device is really just a necessary convenience in their everyday lives. However‚ despite the very high demand for printers‚ inks and paper in the modern world‚ it is overlooked that these materials are expensive to make. Printers and printer inks cost several hundred pesos and few people have the privilege
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identify bacteria: acidic and basic dyes. Acidic dyes are so called because they consist of a salt that has a cation that transfers no color‚ but the anion portion is colored and does give off color. Basic dyes consist of an anion that does not give off any color and a cation that does stain biological samples. Examples of acidic dyes include acid fuchsin and eosin; examples of basic dyes include crystal violet‚ methylene blue and safranin. As a general rule‚ basic dyes are attracted to the surface of
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This experiment consisted of two parts. First‚ the absorption of each dye was evaluated by diluting (1 mg/mL standard) 2.0 mL of dye to 100 mL. The absorbance of each dye standard was measured and documented. The absorbance of the Gatorade was then measured by diluting the solution and pipetting 5.0 mL into a 25.0 mL volumetric flask. The absorption spectrum of the chosen drink was measured. Next‚ the purple Gatorade extraction procedure was carried out‚ beginning with pipetting 1 mL of 70% isopropanol
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Introduction In this Lab the students dealt with Osmosis‚ movement of water molecule or solvent from a high concentration to a low concentration‚ through selective permeability‚ a protective barrier that provide some particle the ’direct ’ passage in and out of the plasma membrane ( Lacerda L.2011) Allowing some molecules enter and exit the cell membrane‚ to create a balance in concentration inside and outside of the cell‚ by doing so the cell often become hypotonic‚ where the concentration
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different concentrations of alcohol to extract red and blue dyes‚ and artificial flavoring. Data: Conclusion: Different dyes are shown when separated by different concentrations of isopropyl alcohol. Discussion of Theory: Chromatography‚ resolution and selectivity played major roles in making the experiment work. The experiment demonstrated a common use of chromatography‚ and works to explain a way to separate mixtures. The dyes were successfully separated and analyzed in the cartridge.
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by the time it took in seconds for the dye to reach the bottom of the glass. The rate of diffusion for the first experiment was 13cm/46sec or 0.28 cm per second‚ the second was 13cm/32sec or 0.41 cm per second‚ and the third was 13cm/42sec. or 0.31 cm per second. The average rate of diffusion was 0.33 cm per second. I hypothesize that the color of the dye could make a slight difference in the rate of diffusion because the molecules that make up the dye may be heavier or lighter depending on what
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