There have been cases where wine has been mistakenly adulterated with ethylene glycol (,2-ethanediol, bp760 97.6 ˚C). As a forensic chemist, suggest how would you use GLC to prove conclusively that ethylene glycol was actually present?
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There have been cases where wine has been mistakenly adulterated with ethylene glycol (,2-ethanediol, bp760 97.6 ˚C). As a
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- Diethylacetal can be detected by gas chromatography. How does this impurity arise in fermentation?An amino acid mixture of phenylalanine, glycine and glutamic acid is to be separated bypaper chromatography. The solvent is less polar than water. Which of these amino acids will have the highest Rf value and which the lowest? Explain. Treatment of a new protein with dansyl chloride reveals two (2) dansyl-labelled derivatives of amino acids, alanine and methionine. What can you deduce about the structure of the protein from these results? Name the amino acids that contribute atoms to both purine and pyrimidine rings.Draw a chromatogram showing the spots when a mixture of the following compounds is separated using water-acetone as the mobile phase in a cellulose-based stationary phase. The following compounds have Rf values of 0.8, 0.6,0.3.
- WILL HEXANE DISSOLVE fenethylline IN GC-MS?A mixture contains the following compounds: octane, octanoic acid, 1-chlorooctane and octanal. Arrange the following compounds in INCREASING Rf if the mixture underwent paper chromatography with the same solvent system used in the experimentExplain the role of trisodium citrate, Na3C6H5O7 as a component of the Benedict’s reagent for the Estimation of Glucose
- What do you expect to happen to the observed densitites and boiling points of the fractions you collect?Principles of separation by capillary IsolachophoresisWe want to extract terpenoids from an aqueous sample by continuous liquid-liquid extraction. Which of the following solvents is not suitable for this purpose? Why? Propanone (acetone), dichloromethane, heptane.
- Consider analysis of a mixture of saturated and unsaturated triacylglycerols (fish oil). Consider 3 methods: IR, NMR, and GC-MS (or LC-MS).How are these methods been used to characterize these molecules? What structural information can be obtained using each method? What are the limitations of each method? Lastly, if you were to use only one which would provide the most detailed structural characterization? Include pictures (structures, spectra etc.) and references with hyperlinks.For an acid-base experiment with access to DCM, HCl & NaOH,trying to seperate a mixture of caffeine, benzoic acid and cellulose, can someone explain how this experiment can be conducted? with the chemicals included andinstrumentationWhich layer (aqueous or organic) would you expect to find 3,5-dimethylaniline in the following liquid-liquid extractions? Explain. Draw chemical structures to help explain your answers. If the structure of themolecule changes in the aqueous solution, then draw the new structure. i. water and dichloromethaneii. aq. NaOH and dichloromethaneiii. aq. HCl and dichloromethane