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The Rf values are 0.70 for salicylic acid and diflunisal, 0.67 for aspirin and methyl salicylate, 0.60 for gentisic acid, 0.57 for p-aminosalicyclic acid, and 0.40 for salicyluric acid. Detection limits of 1 ppm or less for all the analytes compared favorably to limits of more than 20 ppm for Trinder's test.
Different analytes can be distinguished by their Rf values as well as by their appearance under UV light or after treatment with other visualising reagents. This experiment uses TLC to analyse standards of caffeine and three analgesics, acetylsalicylic
The Rf values calculated from the experiments recorded in the photographs on the website were: aspirin (0.55), paracetamol (0.38), caffeine (0.15), and ibuprofen (0.64).
In this experiment, you will analyze the purity of your crude and recrystallized aspirin products using a method called thin layer chromatography (TLC). You will also deter-mine the percent yield of your reaction.
Since polar molecules attract other polar molecules, the aspirin molecules will tend to bind to the silica and not move up the TLC plate in a nonpolar eluent, resulting in a low Rf R f value. When the polarity of the eluent is increased, its ability to attract polar molecules is increased.
From reading 2 Rf value for aspirin is 0.55 , upthamol is 0.47 , caffein is 0.22 and acetaminophen is 0.47 . Reading 1 and 2 has same reading Rf value for caffeine so the drug is caffeine .
RF value of aspirin (RF 0.32) and ascorbic acid (RF 0.14) (Fig. 7) whereas the RF value of paracetamol (RF 0.62) decreases. This alteration in RF value of these drugs in the presence of surfactant in solvent systems, may be due to variable hydrophobic or hydrophilic interactions with these drugs.
